• fsck
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IBM AIX - POWER/PowerPC-based systems
1 It was the first Operating System to introduce the idea of a journaling file system, JFS, which allowed for fast boot times by avoiding the need to ensure the consistency of the file
systems on disks (see fsck) on every reboot
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Git (software) - Characteristics
1 To check integrity, run the git fsck command.
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inode - Practical considerations
1 Many computer programs used by system administrators in UNIX Operating Systems often designate files with inode numbers. Examples include popular disk integrity
checking utilities such as the fsck or pfiles. Thus, the need naturally arises to translate inode numbers to file pathnames and vice versa. This can be accomplished using the
file finding utility find with the -inum option, or the ls command with the proper option (-i
on POSIX compliant platforms).
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Btrfs - Checking and recovery
1 Unix systems traditionally rely on "fsck" programs to check and repair
filesystems. The btrfsck program is now available but, as of May 2012, it is
described by the authors as "relatively new code" which has "not seen
widespread testing on a large range of real-life breakage", and that "may cause
additional damage in the process of repair".
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Hard disk drive - Integrity and failure
1 For logical damage to file systems, a variety of tools, including fsck on UNIX-like systems and CHKDSK on
Windows, can be used for data recovery
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Unix - Components
1 System utilities – administrative tools such as mkfs, fsck, and many
others.
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ext3 - Advantages
1 The ext2 and ext3 file systems share the same standard set of utilities, e2fsprogs, which includes an fsck
tool
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ext3 - Functionality
1 ext3, like most current Linux filesystems, cannot be fsck-ed while
the filesystem is mounted for writing. Attempting to check a file system
that is already mounted may detect bogus errors where changed data has not reached the disk yet, and
corrupt the file system in an attempt to "fix" these errors.
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IBM AIX (operating system) - POWER/PowerPC-based systems
1 It was the first Operating System to introduce the idea of a journaling file system, IBM Journaled File System 2
(JFS2)|JFS, which allowed for fast boot times by avoiding the need to ensure
the consistency of the file systems on disks (see fsck) on every reboot
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Kyoto Cabinet - Practical functionality
1 If inconsistency of the database is detected when opening the
database, all regions are scanned as with fsck and the database is
reconstructed with surviving records implicitly.
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Lustre (file system) - History
1 This contract covered the completion of features, including improved Single Server Metadata Performance scaling, which allows Lustre to
better take advantage of many-core metadata server; online Lustre distributed filesystem
checking (LFSCK), which allows verification of the distributed filesystem state between data and
metadata servers while the filesystem is mounted and in use; and Distributed Namespace (DNE),
formerly Clustered Metadata (CMD), which allows the Lustre metadata to be distributed across
multiple servers
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Lustre (file system) - Release history
1 The MDS LFSCK feature can verify and repair the Object Index (OI) file
while the file system is in use, after a file-level backup/restore or corruption
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Lustre (file system) - Release history
1 The LFSCK feature allows scanning and verifying the internal consistency of the MDT FID and LinkEA attributes
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ZFS - Resilvering and scrub
1 ZFS has no fsck repair tool equivalent, common on Unix filesystems, which does
file system validation and file system repair.No fsck utility equivalent exists for ZFS. This utility has traditionally served two purposes, those of file system repair and file system validation. Instead, ZFS
has a repair tool called scrub which examines and repairs silent corruption
and other problems. Some differences are:
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ZFS - Resilvering and scrub
1 * fsck must be run on an offline filesystem, which means the
filesystem must be unmounted and is not usable while being repaired.
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ZFS - Resilvering and scrub
1 * fsck usually only checks metadata (such as the journal log) but never checks the data itself. This means, after an fsck, the data might still be
corrupt.
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ZFS - Resilvering and scrub
1 * scrub checks everything, including metadata and the data. The effect can be observed by comparing fsck to scrub times — sometimes a fsck on a large RAID completes in a few
minutes, which means only the metadata was checked. Traversing all metadata and data on a large RAID takes many hours, which is exactly
what scrub does.https://store.theartofservice.com/itil-2011-foundation-complete-certification-kit-fourth-edition-study-guide-ebook-and-online-course.html
Unix File System - Implementations
1 To overcome the remaining issues after a failure, a background fsck utility was
introduced.
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Unix File System - Implementations
1 FreeBSD 9.0 adds support for lightweight journaling on top of
softupdates(SU+J), which greatly reduces the need for background fsck, and uses NFS-style ACLs by
default.
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Microsoft ScanDisk
1 On Unix-like systems there are
tools like fsck_msdosfs to do
the same task.https://store.theartofservice.com/itil-2011-foundation-complete-certification-kit-fourth-edition-study-guide-ebook-and-online-course.html
Fsck
1 The system utility 'fsck' (for 'f'ile 's'ystem 'c'hec'k') is a tool for
checking the consistency of a file system in Unix and Unix-like
operating systems, such as Linux and Mac OS X.
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Fsck - Use
1 Generally, fsck is run automatically at boot time. There are two common triggers for automatically executing fsck. Either the
operating system detects that a file system is in an inconsistent state (likely due to a non-graceful shutdown such as a Crash
(computing)|crash or power loss), or after a certain number of times that the file system
is mounted (to prevent small, undetected inconsistencies from becoming
exacerbated).https://store.theartofservice.com/itil-2011-foundation-complete-certification-kit-fourth-edition-study-guide-ebook-and-online-course.html
Fsck - Use
1 The fsck command works directly on data-structures that are internal, and intrinsically specific to a file system implementation. A
matching fsck command that is tailored specifically to the design of the file system is
often provided by the authors of a file system. The exact behaviors of various fsck
implementations vary, but they typically follow a common order of internal operations
and provide a common command-line interface to the user.
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Fsck - Use
1 Most fsck utilities provide options for either interactively repairing
damaged file systems (the user must decide how to fix specific problems),
automatically deciding how to fix specific problems (so the user does not have to answer any questions), or reviewing the problems that need
to be resolved on a file system without actually fixing them
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Fsck - Use
1 A journaling file system is designed such that tools such as fsck do not
need to be run after unclean shutdown (i.e
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Fsck - Use
1 While fsck usually only checks metadata, such as the journal log, but never checks the data itself,
scrub checks everything, including metadata and the data
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Fsck - Use as profanity
1 Because of the severity of fsck not being able to resolve this error, the terms fsck and fscked have come
into use among Unix system administrators as a minced oath.
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Fsck - Use as profanity
1 A report from a question and answer session at USENIX 1998 claims that fsck originally had a different name.
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Fsck - Use as profanity
1 :Dennis Ritchie: Well, the second letter was
differenthttps://groups.google.com/forum/#!msg/alt.sysadmin.recovery/tsGbbkvHo2c/6T-Pj9d3A6wJhttp://www.c2.com/cgi/wiki?MindFsck
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Fsck - Use as profanity
1 Another online use of the term, not really profanity but a curt way of dismissing someone, was Go fsck
yourself, meaning to go and correct your issue (attitude, ignorance of the subject matter, etc.) before posting
again. This takes the fsck process as a metaphor, since running fsck involves rebooting and fixing
fundamental errors on the hard drive before continuing work on the
computer.
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Expect
1 It is used to automate control of interactive application software|applications such as telnet, ftp,
Passwd (command)|passwd, fsck, rlogin, tip (unix utility)|tip, Secure
Shell|ssh, and others
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Fuck - Common alternatives
1 Huff Jr., Re: Mandrake 8.2 Musings, alt.os.linux.mandrake,
[http://groups.google.com/group/alt.os.linux.mandrake/msg/3641a310fcc6ed93?dmode=source
Google Groups] At some point in your Linux career you should ask yourself: 'If there are
3.4million successful, happy Mandrake users...what the 'fsck' is wrong with me?' In
Battlestar Galactica the bowdlerized form 'Frak (expletive)|Frack' (spelt 'Frak (expletive)|Frak' in
the Battlestar Galactica (reimagining)|reimagined 2003 version) was used as a substitute for fuck
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List of DOS commands - CHKDSK
1 Equivalent to the Unix command fsck
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AdvFS
1 The original team had enough confidence in its log based recovery
to release it without an fsck style recovery utility on the assumption that the file system journal would always be allocated on mirrored
drives.
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EncFS - Advantages
1 * Corruption of data is more isolated. Data corruption of filedata is local to a single file and data corruption of
the filesystem can be corrected with a reliable filesystem repair utility like fsck. In some whole-disk encryption
systems, one or both of these attributes are not present.
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F2FS - Implemented
1 * Offline Fsck|filesystem check (Check and fix
inconsistency[https://lkml.org/lkml/2014/9/20/104 f2fs-tools: release 1.4.0]
by Jaegeuk Kim)
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DRBD - Mode of operation
1 This transition may require a subsequent verification of the
integrity of the file system stacked on top of DRBD, by way of a fsck|filesystem check or a journaling
filesystem|journal replay
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HFS Plus - Linux
1 The Linux kernel includes the hfsplus module[http://git.kernel.org/?p=linux/kernel
/git/torvalds/linux-2.6.git;a=tree;f=fs/hfsplus;hb=HEAD Git Repository Kernel.org] for mounting HFS+ filesystems read-write. HFS+ fsck and mkfs have been ported to
Linux and are part of the hfsprogs package.[http://packages.debian.org/sid/hfsprogs
User-space supporting tools for HFS+ filesystems under Posix systems.]
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BBC Redux - Technical details
1 The fsck-free ZFS file system is used after experiments with Unix File
System (UFS) proved it to be too slow
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CHKDSK
1 'CHKDSK' (short for check disk) is a system software|system tool in DOS, OS/2 and Windows. It verifies the file
system integrity of a Volume (computing)|volume and fixes logical file system errors. It is similar to the
fsck command in Unix.
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