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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | COLOPHON |
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xfs_admin(8) System Manager's Manual xfs_admin(8)
xfs_admin - change parameters of an XFS filesystem
xfs_admin [ -eflpu ] [ -c 0|1 ] [ -L label ] [ -U uuid ] device [
logdev ]
xfs_admin -V
xfs_admin uses the xfs_db(8) command to modify various parameters
of a filesystem.
Devices that are mounted cannot be modified. Administrators must
unmount filesystems before xfs_admin or xfs_db(8) can convert
parameters. A number of parameters of a mounted filesystem can
be examined and modified using the xfs_growfs(8) command.
The optional logdev parameter specifies the device special file
where the filesystem's external log resides. This is required
only for filesystems that use an external log. See the mkfs.xfs
-l option, and refer to xfs(5) for a detailed description of the
XFS log.
-e Enables unwritten extent support on a filesystem that does
not already have this enabled (for legacy filesystems, it
can't be disabled anymore at mkfs time).
-f Specifies that the filesystem image to be processed is
stored in a regular file at device (see the mkfs.xfs -d
file option).
-j Enables version 2 log format (journal format supporting
larger log buffers).
-l Print the current filesystem label.
-p Enable 32bit project identifier support (PROJID32BIT
feature).
-u Print the current filesystem UUID (Universally Unique
IDentifier).
-c 0|1 Enable (1) or disable (0) lazy-counters in the filesystem.
Lazy-counters may not be disabled on Version 5 superblock
filesystems (i.e. those with metadata CRCs enabled).
This operation may take quite a bit of time on large
filesystems as the entire filesystem needs to be scanned
when this option is changed.
With lazy-counters enabled, the superblock is not modified
or logged on every change of the free-space and inode
counters. Instead, enough information is kept in other
parts of the filesystem to be able to maintain the counter
values without needing to keep them in the superblock.
This gives significant improvements in performance on some
configurations and metadata intensive workloads.
-L label
Set the filesystem label to label. XFS filesystem labels
can be at most 12 characters long; if label is longer than
12 characters, xfs_admin will truncate it and print a
warning message. The filesystem label can be cleared
using the special "--" value for label.
-U uuid
Set the UUID of the filesystem to uuid. A sample UUID
looks like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
The uuid may also be nil, which will set the filesystem
UUID to the null UUID. The uuid may also be generate,
which will generate a new UUID for the filesystem. Note
that on CRC-enabled filesystems, this will set an
incompatible flag such that older kernels will not be able
to mount the filesystem. To remove this incompatible
flag, use restore, which will restore the original UUID
and remove the incompatible feature flag as needed.
-V Prints the version number and exits.
The mount(8) manual entry describes how to mount a filesystem
using its label or UUID, rather than its block special device
name.
mkfs.xfs(8), mount(8), xfs_db(8), xfs_growfs(8), xfs_repair(8),
xfs(5).
This page is part of the xfsprogs (utilities for XFS filesystems)
project. Information about the project can be found at
⟨http://xfs.org/⟩. If you have a bug report for this manual page,
send it to linux-xfs@vger.kernel.org. This page was obtained
from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-11.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
xfs_admin(8)
Pages that refer to this page: fstab(5), xfs(5), mkfs.xfs(8), mount(8), xfs_db(8), xfs_repair(8)
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