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xfs_admin [ -eflpu ] [ -c 0|1 ] [ -L label ] [ -U uuid ] device
xfs_admin uses the xfs_db(8) command to modify various parameters of a
Devices that are mounted cannot be modified. Administrators must
unmount filesystems before xfs_admin or xfs_db(8) can convert parame-
ters. A number of parameters of a mounted filesystem can be examined
and modified using the xfs_growfs(8) command.
-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
-l Print the current filesystem label.
-p Enable 32bit project identifier support (PROJID32BIT feature).
-u Print the current filesystem UUID (Universally Unique IDenti-
-c 0|1 Enable (1) or disable (0) lazy-counters in the filesystem. This
operation may take quite a bit of time on large filesystems as
the entire filesystem needs to be scanned when this option is
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
Set the filesystem label to label. XFS filesystem labels can be
at most 12 characters long; if label is longer than 12 charac-
ters, xfs_admin will truncate it and print a warning message.
The filesystem label can be cleared using the special "--" value
Set the UUID of the filesystem to uuid. A sample UUID looks