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xfs_admin(8) System Manager's Manual xfs_admin(8) NAME xfs_admin - change parameters of an XFS filesystem SYNOPSIS xfs_admin [ -eflpu ] [ -c 0|1 ] [ -L label ] [ -U uuid ] device xfs_admin -V DESCRIPTION xfs_admin uses the xfs_db(8) command to modify various parameters of a filesystem. Devices that are mounted cannot be modified. Administrators must un- mount filesystems before xfs_admin or xfs_db(8) can convert parameters. A number of parameters of a mounted filesystem can be examined and mod- ified using the xfs_growfs(8) command. OPTIONS -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 IDenti- fier). -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 changed. With lazy-counters enabled, the superblock is not modified or logged on every change of the free-space and inode counters. In- stead, enough information is kept in other parts of the filesys- tem 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 charac- ters, 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. -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. SEE ALSO mkfs.xfs(8), mount(8), xfs_db(8), xfs_growfs(8), xfs_repair(8), xfs(5). xfs_admin(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO
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