xfs_admin

What it does

How to write it

xfs_admin [-eflpu] [-O FEATURES] [-c 0|1] [-L LABEL] [-U UUID] DEVICE [LOGDEV]

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$ run as a normal user# run as root (or with sudo)

1. 1Show the label and UUID

   #xfs_admin -l -u /dev/vdb1
   label = "data"
   UUID = 4e5c7a6b-3f1d-4c2e-9a5b-7d2f8e1c0a93

   Same values as blkid.

2. 2Set a label

   #umount /data; xfs_admin -L data /dev/vdb1

   Unmount first.

3. 3Remove the label

   #xfs_admin -L -- /dev/vdb1

   Clears it.

4. 4New UUID for a cloned disk

   #xfs_admin -U generate /dev/vdb1

   Two XFS file systems with the same UUID cannot be mounted at the same time.

5. 5Mount a clone once without changing it

   #mount -o nouuid /dev/vdc1 /mnt

   Temporary workaround.

6. 6Label on a mounted file system (newer xfsprogs)

   #xfs_io -c 'label -s data' /data

   No unmount needed.

7. 7Enable timestamps after 2038

   #xfs_admin -O bigtime=1 /dev/vdb1

   New file systems have it by default.

8. 8Check the result

   $lsblk -f /dev/vdb1

   LABEL and UUID columns.

9. 9Fix fstab after a UUID change

   #grep vdb1 /etc/fstab; blkid -s UUID -o value /dev/vdb1

   Update the UUID in fstab or the system may not boot.

10. 10Info of a mounted XFS

    #xfs_info /data

    xfs_admin needs unmounted devices; xfs_info works on mounted ones.

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Exit codes