1xfs_admin(8) System Manager's Manual xfs_admin(8)
2
3
4
6 xfs_admin - change parameters of an XFS filesystem
7
9 xfs_admin [ -eflpu ] [ -c 0|1 ] [ -L label ] [ -U uuid ] device
10
12 xfs_admin uses the xfs_db(8) command to modify various parameters of a
13 filesystem.
14
15 Devices that are mounted cannot be modified. Administrators must
16 unmount filesystems before xfs_admin or xfs_db(8) can convert parame‐
17 ters. A number of parameters of a mounted filesystem can be examined
18 and modified using the xfs_growfs(8) command.
19
21 -e Enables unwritten extent support on a filesystem that does not
22 already have this enabled (for legacy filesystems, it can't be
23 disabled anymore at mkfs time).
24
25 -f Specifies that the filesystem image to be processed is stored in
26 a regular file at device (see the mkfs.xfs -d file option).
27
28 -j Enables version 2 log format (journal format supporting larger
29 log buffers).
30
31 -l Print the current filesystem label.
32
33 -p Enable 32bit project identifier support (PROJID32BIT feature).
34
35 -u Print the current filesystem UUID (Universally Unique IDenti‐
36 fier).
37
38 -c 0|1 [22mEnable (1) or disable (0) lazy-counters in the filesystem. This
39 operation may take quite a bit of time on large filesystems as
40 the entire filesystem needs to be scanned when this option is
41 changed.
42
43 With lazy-counters enabled, the superblock is not modified or
44 logged on every change of the free-space and inode counters.
45 Instead, enough information is kept in other parts of the
46 filesystem to be able to maintain the counter values without
47 needing to keep them in the superblock. This gives significant
48 improvements in performance on some configurations and metadata
49 intensive workloads.
50
51 -L label
52 Set the filesystem label to label. XFS filesystem labels can be
53 at most 12 characters long; if label is longer than 12 charac‐
54 ters, xfs_admin will truncate it and print a warning message.
55 The filesystem label can be cleared using the special "--" value
56 for label.
57
58 -U uuid
59 Set the UUID of the filesystem to uuid. A sample UUID looks
60 like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16". The uuid may
61 also be nil, which will set the filesystem UUID to the null
62 UUID. The uuid may also be generate, which will generate a new
63 UUID for the filesystem.
64
65 The mount(8) manual entry describes how to mount a filesystem using its
66 label or UUID, rather than its block special device name.
67
69 mkfs.xfs(8), mount(8), xfs_db(8), xfs_growfs(8), xfs_repair(8), xfs(5).
70
71
72
73 xfs_admin(8)