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Which two meters can the administrator use for the system capacity calculation when the FailOverPolicy of a service group is set to BiggestAvailable? (Select two.)
Answer: B, E
QUESTION: 79 DRAG DROP
Match all five Veritas Cluster Server global cluster options on the left to the corresponding definitions on the right.
The service group named websg is currently online on the sys3 node. All other nodes are running. Consider the following partial main.cf file:
What happens to the websg service group if the administrator inadvertently shuts down a critical resource outside of the cluster?
nothing; the FailOverPolicy is Priority
it will switch to the sys1 node
it will switch to the sys2 node
nothing; the service group is frozen
Veritas Cluster Server supports the Intelligent Monitoring Framework (IMF) which assists clustered environments by reducing polling overhead and failure detected times. Which two agents are IMF aware? (Select two.)
Answer: A, D
Which two standard Veritas Cluster Server resource types can determine if an application is taken offline unexpectedly outside the clusterâ€™s control? (Select two.)
Answer: A, E
An administrator wants to install InfoScale Availability.
Which hardware requirement ensures successful installation of Veritas Cluster Server?
at least one SCSI or Fibre Channel Host Bus Adapter per system
at least one dedicated Ethernet interface per system for private interconnects
all shared storage disks support SCSI-3 Persistent Reservations
gigabit Ethernet using enterprise-class switches for private interconnects
Answer: A, D
Which action is performed by the CoordPoint agent?
Is registers cluster nodes with coordination disks and coordination point servers.
It monitors only the coordination point server.
It monitors cluster node registrations with coordination point servers and SCSI-3 disks.
It removes offline cluster nodes from the coordination point servers.
Veritas VCS-256 Exam (Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux) Detailed Information
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Exam VCS-321: Administration of Veritas Backup Exec 15
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VCS-256 Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux
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Test Code : VCS-256
Test Name : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux
Vendor Name : Veritas
Q&A : 84 Real Questions
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Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux education
more About Filesystems | VCS-256 Real Questions and VCE Practice Test
This chapter is from the book ?
If we consider filesystems as a mechanism for both storing and finding statistics, then the two key facets for any filesystem are the items being kept and the checklist of where those items are. The deeper details of how a given filesystem manipulates its facts and meta-advice go beyond the scope of this chapter however are addressed extra in Appendix B, "Anatomy of a Filesystem."
Filesystem accessories That the Admin needs to learn about
As always, we deserve to get a deal with on the vocabulary earlier than we are able to take into account how the elements of a filesystem work together. The subsequent three sections describe the simple add-ons with which you, as a sysadmin, deserve to be usual.
the most intuitively glaring add-ons of a filesystem are, of course, its info. as a result of everything in UNIX is a file, special capabilities are differentiated via file type. There are fewer file types than you could think about, as table 3.2 shows.
table 3.2 File types and purposes, with Examples
continues information for directory structure
Buffered equipment file
uncooked machine file
UNIX domain socket
Interprocess conversation (IPC)
See output of commands for info Linux: netstat –x Solaris: netstat -f unix
Named pipe special (FIFO equipment)
First-in-first-out IPC mechanism, Invoked via name
Linux: /dev/initctl Solaris: /and so forth/utmppipe/and so on/cron.d/FIFO
Pointer to yet another file (any classification)
/usr/tmp -> ../var/tmp
All other info; holds facts of all different types
text data Object files Database data Executables/binaries
be aware that directories are a sort of file. The key's that they have a particular category of structure and contents (see Appendix B for more details). A listing holds the filenames and index numbers (see the following part, "Inodes") of all its constituent information, including subdirectories.
directory information aren't flat (or regular) info, however are listed (like a database), so that you should nevertheless locate a file straight away you probably have a huge number of files within the equal directory.13
in spite of the fact that file handling is commonly clear, it is essential to bear in mind that a file's records blocks14 may additionally no longer be stored sequentially (or even in the same accepted disk location). When information blocks are commonly scattered in an uncoordinated method, it could possibly have an effect on access times and raise I/O overhead.
Meta-assistance about files is stored in buildings called index nodes, or inodes. Their contents vary in accordance with the particular filesystem in use, but all inodes grasp the following assistance in regards to the file they index:15
Inode identification number
owners: user and group
ctime: final file status change time
mtime: final data modification time16
atime: closing access time
physical vicinity assistance for information blocks
notice that the filename is not saved in the inode, but as an entry in the file's closest guardian directory.
All other assistance a few file that ls displays is saved in an inode somewhere. With a number of handy alternatives, that you may pull out a lot of advantageous counsel. as an instance that you just wish to be aware of the inode number of the Solaris kernel.17 You just supply the –i option, and voilá:
[sun:10 ~]ls -i /kernel/genunix
Of direction, ls –l is an old friend, telling you most every little thing that you just need to recognize. looking on the Solaris kernel again, you get the output in figure three.4.
determine 3.four Diagrammed Output of ls on a File
observe that the timestamp shown by way of default in an extended record is mtime. you could pass quite a lot of alternate options to ls to view ctime and atime instead. For other nifty variations, see the ls man page.
File Permissions and possession Refresher
as a result of UNIX become designed to aid many clients, the query naturally arises a way to understand who can see what data. the first and simplest answer is easily to let clients to determine handiest their personal info. This, of path, would make it tricky, if now not unimaginable, to share, creating tremendous difficulties in collaborative environments and inflicting a string of other problems: Why can't I run ls? because the equipment created it, no longer you, is only probably the most glaring illustration of such issues.
users and agencies
UNIX uses a 3-half gadget to determine file entry: there's what you, because the file proprietor, are allowed to do; there may be what the group is allowed to do; and there is what other americans are allowed to do. let's have a look at what Elvis's permissions look like:
[ elvis@frogbog elvis ]$ ls -l
drwxr-xr-x 5 elvis users 4096 Dec 9 21:55 computer
drwxr-xr-x 2 elvis clients 4096 Dec 9 22:00 Mail
-rw-r--r-- 1 elvis users 36 Dec 9 22:00 README
-rw-r--r-- 1 elvis users 22 Dec 9 21:fifty nine ThisFile
drwxr-xr-x 2 elvis users 4096 Dec 12 19:57 arc
drwxr-xr-x 2 elvis users 4096 Dec 10 00:40 songs
-rw-r--r-- 1 elvis clients 46 Dec 12 19:fifty two tao.txt
-rw-r--r-- 1 elvis users 21 Dec 9 21:59 thisfile
-rw-r--r-- 1 elvis users forty five Dec 12 19:52 west.txt
so long as we're right here, let's spoil down exactly what's being displayed. First, we have a ten-persona string of letters and hyphens. this is the illustration of permissions, which i could break down in a minute. The second item is a bunch, always a single digit. here is the variety of difficult links to that directory. i'll focus on this later during this chapter. The third component is the username of the file proprietor, and the fourth is the name of the file's community. The fifth column is a bunch representing the dimension of the file, in bytes. The sixth includes the date and time of closing change for the file, and the final column suggests the filename.
every consumer on the equipment has a username and a host it is associated with that consumer. This number commonly is referred to as the UID, short for user identity. If a user has been deleted but, for some cause, his info remain, the username is changed with that consumer's UID. in a similar way, if a group is deleted however still owns data, the GID (group number) shows up instead of a reputation in the neighborhood container. There are also different cases through which the gadget can't correlate the identify and the quantity, but these should be noticeably infrequent occurrences.
As a user, you cannot change the owner of your info: this could open up some critical safety holes on the system. best root can chown files, but if he makes a mistake, which you could now ask root to chown the files to you. As a user, which you can chgrp a file to a distinct neighborhood of which you're a member. it really is, if Elvis is a member of a bunch named clients and a group named elvis, he can chgrp elvis west.txt or chgrp users west.txt, but as a result of he isn't a member of the neighborhood beatles, he cannot chgrp beatles west.txt. A user can belong to any variety of organizations. frequently (although this varies slightly by using taste), information created belong to the community to which the directory belongs. On most up to date UNIX editions, the community that owns info is some thing neighborhood is listed as your fundamental neighborhood by means of the gadget in the /and many others/passwd file and may be changed via the newgrp command. On these methods, Elvis can chgrp
clients if he wishes his data to belong to the clients group, or he can chgrp elvis if he wants his information to belong to the elvis neighborhood.
So, what have been these humorous strings of letters and hyphens at first of each lengthy listing record? I already pointed out that they represented the permissions of the file, however this is no longer notably positive. the ten characters of that string represent the permission bits for each file. the first persona is separate, and the closing 9 are three very identical groups of three characters. i could explain each of these in flip.
if you appear again to Elvis's long listing of his listing, you'll see that many of the data readily have a hyphen because the first character, whereas a couple of possess a d in this container. The extra astute reader may observe that the information with a d in that first field all take place to be directories. there may be a good explanation for this: the first permissions persona denotes no matter if that file is a different file of one variety or one more.
What's a different file? or not it's either some thing that is rarely basically a file (in the sense of a sequential movement of bytes on a disk) however that UNIX treats as a file, similar to a disk or a video display, or some thing that is in reality a file but this is treated in a different way. A directory, by means of necessity, is a circulation of bytes on disk, but that d ability that or not it's treated otherwise.
The subsequent three characters represent what the person who owns the file can do with it. From left to appropriate, these permissions are read, write, and execute. read permission is barely that—the capability to see the contents of a file. Write permission implies no longer most effective the right to alternate the contents of a file, however additionally the correct to delete it. If I don't possess write permission to a file, rm not_ authorised.txt fails.
Execute permission determines no matter if the file is additionally a command that can also be run on the device. because UNIX sees every thing as a file, all commands are stored in data that will also be created, modified, and deleted like another file. The computing device then needs a method to tell what can and might't be run. The execute bit does this.
one more critical cause that you simply should fret about even if a file is executable is that some classes are designed to be run handiest by means of the equipment administrator: These courses can adjust the laptop's configuration or may also be dangerous in every other way. because UNIX allows you to specify permissions for the owner, the neighborhood, and different clients, the execute bit allows for the administrator to restrict using unhealthy courses.
Directories deal with the execute permission in another way. If a directory doesn't have execute permissions, that user (or community, or other users on the equipment) can't cd into that directory and might't study tips concerning the info in that directory. (You usually can discover the names of the data, besides the fact that children.) besides the fact that you've got permissions for the information in that listing, you frequently can not examine them. (This varies just a little through platform.)
The second set of three characters is the group permissions (examine, write, and execute, in that order), and the closing set of three characters is what different clients on the device are approved to do with that file. because of safety issues (either because of different users to your system or as a result of pervasive networks such as the internet), giving write access to other clients is extremely discouraged.
high-quality, which you can now read the permissions in the directory record, but what can you do with them? as an instance that Elvis desires to make his directory readable best by using himself. He can chmod go-rwx ~/songs: That skill eliminate the read, write, and execute permissions for the community and others on the equipment. If Elvis decides to let Nashville artists take a look at his material however now not exchange it (and if there is a bunch nashville on the equipment), he can first chgrp nashville songs and then chmod g+r songs.
If Elvis does this, besides the fact that children, he'll locate that (at the least, on some structures) contributors of group nashville cannot look at them. Oops! With a simple chmod g+x songs, the problem is solved:
[ elvis@frogbog elvis ]$ ls -l
drwxr-xr-x 5 elvis clients 4096 Dec 9 21:55 laptop
drwxr-xr-x 2 elvis clients 4096 Dec 9 22:00 Mail
-rw-r--r-- 1 elvis clients 36 Dec 9 22:00 README
-rw-r--r-- 1 elvis users 22 Dec 9 21:fifty nine ThisFile
drwxr-xr-x 2 elvis clients 4096 Dec 12 19:57 arc
drwxr-x--- 2 elvis nashvill 4096 Dec 15 14:21 songs
-rw-r--r-- 1 elvis users 46 Dec 12 19:fifty two tao.txt
-rw-r--r-- 1 elvis clients 21 Dec 9 21:59 thisfile
-rw-r--r-- 1 elvis clients 45 Dec 12 19:fifty two west.txt
in addition to the study, write, and execute bits, there exists special permissions used by means of the gadget to examine how and when to droop the regular permission guidelines. Any thorough realizing of UNIX requires an figuring out of the setuid, setgid, and sticky bits. For commonplace gadget users, only a normal realizing of these is imperative, and this dialogue is for this reason short. respectable documentation on this area exists in different places for budding device directors and programmers.
The setuid bit applies most effective to executable info and directories. within the case of executable classes, it ability that the given program runs as though the file owner have been running it. it's, xhextris, a variant on Tetris, has the following permissions on my equipment:
1 video games video games 32516 may 18 1999 /usr/X11R6/bin/xhextris
there's a pseudouser known as games on the gadget, which can't be logged into and has no domestic directory. When the xhextris application executes, it could examine and write to information that handiest the online game's pseudouser always can be approved. during this case, there's a high-rating file stored on the system that writeable only by way of that user. When Elvis runs the online game, the system acts as even though he had been the user video games, and therefore he's in a position to shop the high-score file. To set the setuid bit on a file, that you can inform chmod to supply it mode u+s. (you could suppose of this as uid set, despite the fact this isn't technically correct.)
The setgid bit, which stands for "set neighborhood id," works very nearly identically to setuid, apart from that the system acts as notwithstanding the consumer's community is that of the given file. If xhextris had used setgid games in its place of setuid games, the high score can be writeable to any directory owned by the group games. it's used with the aid of the device administrator in techniques fundamentally similar to the setuid permission.
When utilized to directories on Linux, Irix, and Solaris (and probably most different POSIX-compliant UNIX flavors as neatly), the setgid bit ability that new data are given the parent listing's group rather than the person's simple or current community. This may also be beneficial for, say, a directory for fonts developed with the aid of (and for) a given application. Any user might generate the fonts by the use of a setgid command that writes to a setgid listing. setgid on directories varies with the aid of platform; verify your documentation. To set the setgid bit, which you could tell chmod to use g+s (gid set).
youngsters a file in a group or world-writeable directory without the sticky bit will also be deleted by way of any one with write permission for that directory (consumer, neighborhood, or different), a file in a directory with the sticky bit set can be deleted only with the aid of either the file's proprietor or root. here's in particular constructive for developing transient directories or scratch house that may also be used by means of anyone with out one's information being deleted by using others. that you could set permission +t in chmod to provide whatever thing the sticky bit.
Like practically every little thing else on UNIX, permissions have a bunch linked to them. it be commonly considered that permissions are a gaggle of four digits, each between 0 and 7. every of those digits represents a gaggle of three permissions, each of which is a yes/no reply. From left to appropriate, these digits characterize particular permissions, user permissions, group permissions, and other permissions.
So, About these Permission Bits...
Most programs analyzing permission bits expect four digits, although often handiest three are given. Shorter numbers are filled in with main zeros: 222 is treated as 0222, and 5 is treated as 0005. The three rightmost digits are, as up to now outlined, person (proprietor) permissions, group permissions, and different permissions, from right to left.
each of those digits is calculated in the following manner: examine permission has a worth of four, write permission has a value of two, and execute permission has a worth of 1. with ease add these values together, and you've acquired that permission price. read, write, and execute can be 7, study and write devoid of execute would be 6, and no permission to do the rest could be 0. read, write, and execute for the file proprietor, with study and execute for the neighborhood and nothing at all for any individual else, would be 750. read and write for the user and community, but simplest examine for others, would be 664.
The particular permissions are 4 for setuid, 2 for setgid, and 1 for sticky. This digit is prepended to the three-digit numeric permission: a temporary directory with sticky study, write, and execute permission for everybody would be mode 1777. A setuid root directory writeable via nobody else can be 4700. that you would be able to use chmod to set numeric permissions directly, as in chmod 1777 /tmp.
besides a more precise use of chmod, numeric permissions are used with the umask command, which sets the default permissions. extra exactly, it "masks" the default permissions: The umask value is subtracted from the maximum possible settings.* umask deals simplest with the three-digit permission, no longer the full-fledged four-digit price. A umask of 002 or 022 is most generally the default. 022, subtracted from 777, is 755: read, write, and execute for the consumer, and read and execute for the neighborhood and others. 002 from 777 is 775: examine, write, and execute for the person and group, and browse and execute for others. I are likely to set my umask to 077: study, write, and execute for myself, and nothing for my community or others. (Of path, when working on a group mission, I set my umask to 007: My group and i can read, write, or execute the rest, however others cannot do anything else with our information.)
be sure you notice that the umask assumes that the execute bit on the file should be set. All umasks are subtracted from 777 instead of 666, and those added ones are subtracted later, if fundamental. (See Appendix B for more details on permission bits and umask workings.)
*actually, the permission bits are XORed with the highest possible settings, when you are a laptop science type.
also be aware that the first little bit of output prepended to the permissions string shows the file type. this is one effortless way of identifying a file's category. another is the file command, as proven in table 3.3.
desk 3.3 ls File forms and file Output sample
ls File class character
File display instance
[either:1 ~]file /usr/usr: directory
Block particular gadget
[linux: 10 ~] file /dev/hda1/dev/hda1: block special (three/1)[sun:10 root ~]file /dev/dsk/c0t0d0s0/dev/dsk/c0t0d0s0: block special(136/0)
personality particular machine
[linux:11 ~] file /dev/tty0/dev/tty0: persona particular (four/0)
[ensis:11 ~]file /dev/rdsk/c0t0d0s0/dev/rdsk/c0t0d0s0: character particular (136/0)
UNIX domain socket
[linux:12 ~] file /dev/log/dev/log: socket
[sun:12 ~]file /dev/ccv/dev/ccv: socket
Named pipe particular (FIFO gadget)
[linux:13 ~] file /dev/initctl/dev/initctl: fifo (named pipe)
[sun:13 ~]file /etc/utmppipe/etc/utmppipe: fifo
[linux:14 ~] file /usr/tmp/usr/tmp: symbolic link to ../var/tmp
[sun:14 ~]file -h /usr/tmp/usr/tmp: symbolic link to ¬../var/tmp
[linux:15 ~] file /etc/passwd/and many others/passwd: ASCII textual content
[linux:15 ~] file /boot/vmlinux-2.four.2-2/boot/vmlinux-2.4.2-2: ELF 32-bit LSB executable,
¬Intel 80386, edition 1,statically linked, now not stripped
[linux:15 ~] file /and many others/rc.d/init.d/sshd/and so forth/rc.d/init.d/sshd: Bourne-once again shell script text executable
[sun:15 ~]file /etc/passwd
/and many others/passwd: ascii text
[sun:15 ~]file /kernel/genunix
-/kernel/genunix: ELF 32-bit MSB relocatable
¬SPARC edition 1
[sun:15 ~]file /and so forth/init.d/sshd
/and many others/init.d/sshd: executable
word the in-depth counsel that file offers—in lots of instances, it indicates particulars about the file that no other command will easily display (corresponding to what type of executable the file is). These low-level details are past the scope of our discussion, however the man web page has greater information.
essential points concerning the file ommand
file tries to determine what category a file is in accordance with three sorts of check:
The file classification that the ls –l command returns.
-The presence of a magic quantity at the start of the file determining the file class. These numbers are defined within the file /usr/share/magic in red Hat Linux 7.1 and /usr/lib/locale/locale/LC_MESSAGES/magic (or /and so forth/magic) in Solaris eight. customarily, most effective binary data can have magic numbers.
-in the case of a regular/text file, the first few bytes are confirmed to verify the class of textual content illustration and then to verify whether the file has a identified aim, corresponding to C code or a Perl script.
file in reality opens the file and changes the atime in the inode.
Inode lists are maintained via the filesystem itself, including which ones are free to be used. Inode allocation and manipulation is all transparent to each sysadmins and users.
Inodes become tremendous at two times for the sysadmin: at filesystem introduction time and when the filesystem runs out of free inodes. At filesystem introduction time, the full number of inodes for the filesystem is allotted. besides the fact that children they aren't in use, area is decided apart for them. You cannot add any more inodes to a filesystem after it has been created. when you run out of inodes, you need to either free some up (by using deleting or relocating info) or migrate to an additional, greater filesystem.
without inodes, data are only a random assortment of ones and zeros on the disk. There is no ensure that the file should be saved sequentially inside a sector or music, so without an inode to factor the way to the facts blocks, the file is misplaced. truly, every file is uniquely identified by using the mixture of its filesystem name and inode quantity.
See Appendix B for extra detailed advice on the exact content of inodes and their structure.
Linux has a extremely valuable command known as stat that dumps the contents of an inode in a tidy layout:
[linux:9 ~]stat . File: "." dimension: 16384 Filetype: listing Mode: (0755/drwxr-xr-x) Uid: (19529/ robin) Gid:(20/users) device: 0,4 Inode: 153288707 hyperlinks: seventy eight entry: solar Jul 22 13:58:29 2001(00009.04:37:fifty nine) regulate: sun Jul 22 13:fifty eight:29 2001(00009.04:37:fifty nine) change: sun Jul 22 13:58:29 2001(00009.04:37:59) Boot Block and Superblock
When a filesystem is created, two structures are automatically created, whether they're instantly used or now not. the first is referred to as the boot block, the place boot-time counsel is saved. as a result of a partition could be made bootable at will, this constitution has to be accessible invariably.
The other structure, of greater activity right here, is the superblock. just as an inode contains meta-suggestions about a file, a superblock incorporates metainformation a few filesystem. probably the most more important contents are listed here:18
Timestamp: final replace
Superblock state flag
Filesystem state flag: clear, good, energetic
number of free blocks
checklist of free blocks
Pointer to subsequent free block
dimension of inode list
number of free inodes
listing of free inodes
Pointer to next free inode
Lock fields without charge blocks and inodes
summary facts block
and you notion inodes were complex.
The superblock maintains song of free file blocks and free inodes so that the filesystem can keep new files. without these lists and pointers, an extended, sequential search would should be performed to find free house every time a file become created.
In a good deal the identical approach that files with out inodes are misplaced, filesystems devoid of intact superblocks are inaccessible. it truly is why there's a superblock state flag—to point out even if the superblock changed into effectively and fully up-to-date before the disk (or system) changed into ultimate taken offline. If it became not, then a consistency assess must be performed for the total filesystem and the outcomes stored back in the superblock.
again, greater detailed information concerning the superblock and its function in UNIX filesystems could be found in Appendix B.
each pink Hat and Solaris appreciate a mess of distinct filesystem types, besides the fact that children you will often come to be the usage of and supporting just just a few. There are three ordinary forms of filesystem—native, network, and pseudo—and a fourth "tremendous-filesystem" classification it is in fact losing ground, given the dimension of modern disks.
native filesystems are standard to each gadget that has its personal local disk.19 besides the fact that children there are lots of instances of this type of filesystem, they are all designed to work inside a device, managing the components mentioned in the remaining part and interfacing with the physical power(s).
best a couple of native filesystems are particularly designed to be cross-platform (and often even go–OS-class). They turn out to be useful, though, you probably have a nondisk hardware failure; which you can simply take the disk and put it into one other laptop to retrieve the information.20 The UNIX File equipment, or ufs, turned into designed for this; both Solaris and crimson Hat Linux machines can use disks with this filesystem. word that Solaris makes use of u.s.a.filesystems by means of default. crimson Hat's default native filesystem is ext2.
an additional local, cross-platform filesystem is ISO9660, the CD-ROM regular. this is why which you could examine your Solaris CD in a pink Hat field's reader.
native filesystems come in two related but diverse flavors. The original, normal mannequin filesystem remains in large use today. The more recent journaling filesystem category is only starting to in reality come into its personal. The foremost change between both types is the way they track alterations and do integrity tests.
ordinary, nonjournaling filesystems count on flags in the superblock for consistency law. If the superblock flag is not set to "clear," then the filesystem is aware of that it was not shut down effectively: no longer all write buffers were flushed to disk, etc. Inconsistency in a filesystem means that allotted inodes could be overwritten; free inodes may well be counted as in use—in short, rampant file corruption, mass hysteria.
but there is a filesystem integrity checker to save the day: fsck. This command is always invoked instantly at boot-time to examine that each one filesystems are clear and strong. If the / or /usr filesystems are inconsistent, the system may prompt you to beginning up a miniroot shell and manually run fsck. a couple of of the extra important objects checked and corrected are listed right here:
Unclaimed blocks and inodes (no longer in free record or in use)
Unreferenced however allocated blocks and inodes
Multiply claimed blocks and inodes
dangerous inode codecs
unhealthy directory codecs
dangerous free block or inode record formats
flawed free block or inode counts
Superblock counts and flags
note that a filesystem may still be unmounted before running fsck (see the later area "Administering native Filesystems"). running fsck on a established filesystem might cause a system panic and crash, or it may readily refuse to run in any respect. or not it's additionally most fulfilling, notwithstanding now not required, that you simply run fsck on the raw equipment, when possible. See the person web page for greater particulars and alternate options.
So where does fsck put orphans, the blocks and inodes that are obviously in use but don't seem to be referenced any place? Enter the lost+found directories. there is at all times a /misplaced+discovered listing on each system; other directories accrue them as fsck finds orphans in their purview. fsck automatically creates the directories as essential and renames the lost blocks into there with the aid of inode number. See the man pages "mklost+discovered" on crimson Hat and "fsck_ufs" on Solaris.
Journaling filesystems get rid of fsck and its concomitant superblock buildings. All filesystem state assistance is internally tracked and monitored, in tons the equal approach that databases systems set up checkpoints and self-verifications.
With journaling filesystems, you've got a higher probability of full facts recuperation within the experience of a device crash. Even unsaved records in buffers will also be recovered due to the interior log.21 This sort of fault tolerance makes journaling filesystems constructive in excessive- availability environments.
The downside, of path, is that when a filesystem like this receives corrupted by hook or by crook, it items most important difficulties for recuperation. Most journaling filesystems deliver their own salvaging classes for use in case of emergency. This underscores how critical backups are, no remember what sort of filesystem software you have got invested in. See Chapter 16, "Backups," for extra assistance.
some of the earliest journaling filesystems continues to be a industrial undertaking: VxFS by using Veritas. an additional pioneer has decided to unlock its utility into the public domain below GPL22 licensing: JFS23 by way of IBM. SGI's xfs journaling filesystem has been freely obtainable under GPL for the reason that about 1999, even though it is barely designed to work beneath IRIX and Linux.24
protection of filesystem state incurs an overhead when the use of journaling filesystems. because of this, these filesystems operate suboptimally for small filesystem sizes. commonly, journaling filesystems are appropriate for filesystem sizes of 500Mb or extra.
community-based filesystems are really add-ons to local filesystems since the file server must have the actual records stored in a single of its personal native filesystems.25 community file- techniques have both a server and customer application.
The server constantly runs as a daemon on the equipment it truly is sharing disk space. The server's native filesystems are unaffected by way of this added method. basically, the daemon frequently handiest puts a couple of messages within the syslog and is otherwise most effective seen via ps.
The equipment that wants to access the server's disk space runs the client software to mount the shared filesystems throughout the network. The client program handles all the I/O so that the network filesystem behaves just a like a native filesystem towards the client machine.
The ancient standby for community-based mostly filesystems is the network File system (NFS). The NFS usual is presently as much as revision three, although there are reasonably a number of implementations with their own version numbers. each red Hat and Solaris come ordinary with NFS customer and server applications. For greater particulars on the internal workings and configuration of NFS, see Chapter 13, "File Sharing."
other network-primarily based filesystems encompass AFS (IBM's Andrew File system) and DFS/DCE (allotted File system, part of the Open group's disbursed Computing environment). The mechanisms of those superior filesystems go past the scope of this book, youngsters their goal is still the equal: to successfully share files throughout the community transparently to the user.
Pseudofilesystems are a captivating building in that they don't seem to be really involving disk-based mostly partitions. they are as a substitute merely logical constructs that symbolize guidance and meta-information in a hierarchical structure. because of this structure and because they may also be manipulated with the mount command, they're nevertheless referred to as filesystems.
The most desirable example of pseudofilesystems exists on each red Hat and Solaris systems: /proc. under Solaris, /proc is restricted to simply managing procedure guidance:
[sun:1 ~]ls /proc 0 a hundred forty five 162 195 206 230 262 265 272 286 299 303 342 370 403 408 _672 752 1 155 185 198 214 243 263 266 278 292 three 318 360 371 404 fifty two _674 142 157 192 2 224 252 264 268 280 298 302 319 364 four hundred 406 fifty eight _678
word that these directories are all named in accordance with the manner numbers akin to what you possibly can find in the output of ps. The contents of each directory are the quite a few meta-information that the equipment should manage the procedure.
under red Hat, /proc offers suggestions about processes as well as about various system add-ons and information:
[linux:1 ~] ls /proc 1 18767 23156 24484 25567 28163 4 493 674 8453 ksyms _stat 13557 18933 23157 24486 25600 3 405 5 675 9833 loadavg _swaps 13560 18934 23158 24487 25602 3050 418 5037 676 9834 locks _sys 13561 18937 23180 24512 25603 3051 427 5038 7386 9835 mdstat _tty 1647 19709 23902 24541 25771 3052 441 5054 7387 bus meminfo _uptime 1648 19730 23903 24775 25772 30709 455 5082 7388 cmdline misc _version 1649 19732 23936 25494 25773 30710 473 510 7414 cpuinfo modules 16553 19733 24118 25503 25824 30712 485 5101 7636 contraptions mounts 18658 2 24119 25504 25882 30729 486 524 7637 dma mtrr 18660 21450 24120 25527 25920 320 487 558 7638 filesystems internet18661 21462 24144 25533 26070 335 488 6 7662 fs _partitions 18684 21866 24274 25534 26071 337 489 670 8426 interrupts pci 18685 21869 24276 25541 26072 338 490 671 8427 ioports scsi 18686 21870 24277 25542 28161 339 491 672 8428 kcore self 18691 21954 24458 25543 28162 365 492 673 8429 kmsg slabinfo
once again we see the directories named for procedure numbers, however we additionally see directories with indicative names similar to cpuinfo and loadavg. as a result of here is a hierarchical filesystem, you could cd into these directories and skim the various information for his or her gadget information.
the most entertaining factor about /proc is that it allows for even tactics to be handled like information.26 This skill that fairly an awful lot every thing in UNIX, no matter if it's some thing that simply exists or anything that actually occurs, can now be considered a file.
For more advice below purple Hat, type man proc. For more suggestions under Solaris, classification man –s 4 proc.
ultimately, there are the "super-filesystems" or logical volumes that do what the different fundamental sorts of filesystem cannot: surmount the boundaries of partitions. You may well ask why anyone would are looking to do this. There are two factors. First, as a result of disks used to be plenty smaller and greater expensive, you used what you had at hand. in case you crucial a large pool of disk house, logical volumes allowed you to aggregate remnants into something useable. 2nd, even with bigger disks, you still may not be able to achieve the kind of disk space required by using a specific researcher or software. once once more, logical volumes will let you combination partitions across disks to kind one significant filesystem.
Crossing disk boundaries with a logical quantity is known as disk spanning. after you have logical volumes, that you may even have some relatively complex records administration methods and performance-enhancing suggestions. Disk striping, for example, is a efficiency booster. instead of sequentially filling one disk and then the subsequent in sequence, it spreads the information in discrete chunks throughout disks, enabling more desirable I/O response via parallel operations.
RAID27 implements logical volumes at 10 distinctive degrees, with a lot of features at every stage. This implementation will also be achieved both in hardware or in utility, despite the fact the nomenclature for each is a similar.28
desk three.4 RAID tiers
now not self-repairing
-Requires added drives for facts duplication
(Very similar to RAID-3)
Requires separate parity disk
Requires separate parity disk
(Very comparable to RAID-5)
Slowest for writes, however
Rotating parity array
decent for reads
Requires three to 5 separate parity disks
Reconstruction by using parity facts (now not duplication)
RAID-5 + secondary
now not in vast use
RAID-5 + precise-time embedded controller
now not in wide use
-RAID-0 array duplicated (mirrored)
-every stripe is RAID-1 (mirrored) array
Array of parity stripes
each and every stripe is RAID-three array
obviously, the sort of complexity inherent in all logical extent techniques requires some kind of lower back-end management system. pink Hat presents the Logical volume supervisor (LVM) as a kernel module. whereas the details of LVM are beyond the scope of this ebook, it's wonderful to notice that you should put any filesystem that you simply want on right of the logical extent. birth at http://www.linuxdoc.org/HOWTO/LVM-HOWTO.htmlfor greater details.
however solar presents logical quantity administration, it is thru a for-pay application called "Solstice DiskSuite." The filesystem on DiskSuite logical volumes ought to be ufs. For greater counsel, beginning at http://medical doctors.sun.com/ab2/coll.260.2/DISKSUITEREF.
an extra industrial logical quantity manager for Solaris comes from Veritas; see: http://www.veritas.com/us/items/volumemanager/faq.html#a24
The fantastic thing about all logical volumes is that they look like simply an additional local filesystem and are fully transparent to the person. youngsters, logical volumes do add some complexity for the methods administrator, and the schema should be carefully documented on paper, in case it has to be re-created.
constantly, a file server's disks are directly connected to the file server. With network-connected storage (NAS), the file server and the disks that it serves are separate entities, communicating over the native network. The storage disks require an combination controller that arbitrates file I/O requests from the external server(s). The server(s) and the mixture controller every have different network IP addresses. To serve the info to customers, a file (or application) server sends file I/O requests to the NAS combination controller and relays the effects returned to client techniques.
NAS is touched on here for completeness—total books can also be written about NAS design and implementation. NAS doesn't really represent a kind of filesystem, however somewhat it's a mechanism to relieve the file server from the details of hardware disk entry through setting apart them within the community-connected storage unit.
pink Hat Filesystem Reference table
table three.5 lists principal filesystems that presently assist (or are supported by means of) pink Hat.29 The filesystem kinds which are at the moment natively supported are listed in /usr/src/linux/ fs/filesytems.c.
desk 3.5 Filesystem types and purposes, with Examples (crimson Hat)
selected situations (as utilized in /and so forth/fstab)
purple Hat default filesystem
Journaling filesystem from IBM
Journaling filesystem from SGI
windows compatibility: DOS
home windows compatibility: NT
windows compatibility: fats-32
Adfs hfs romfs
Affs hpfs smbfs
Coda mnix udf
devpts ncpfs umsdos
Deprecated, pre-kernel 2.1.21
network-based remote conversation
shop technique (and other device) meta-guidance
Solaris Filesystem Reference table
desk 3.6 lists foremost filesystems that at the moment support (or are supported through) Solaris. The filesystem varieties that at present are natively supported are listed as directories below /usr/lib/fs.
desk 3.6 Filesystem kinds and functions, with Examples (Solaris)
certain cases (as utilized in /and many others/vfstab)
Solaris default filesystem; pink Hat-compatible
Journaling filesystem from IBM
community-primarily based far flung communication
keep process metainformation
Fdfs swapfs tmpfs
Mount metainformation areas as filesystems
mntfs cachefs lofs
fifofs specfs udfs namefs
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