Lustre 1.6 Operations Manual

1. Make a mountpoint for the mkdir /mnt/mds filesystem.
2. Mount the filesystem there.
■ For 2.4 kernels use: mount -t ext3 {dev} /mnt/mds
■ For 2.6 kernels use: mount -t ldiskfs {dev} /mnt/mds
3. Change to the mount point being backed up. Type:
cd /mnt/mds
4. Back up the EAs. Type:
getfattr -R -d -m '.*' -P . > ea.bak
The getfattr command is part of the "attr" package in most distributions.
If the getfattr command returns errors like "Operation not supported" then your
kernel does not support EAs correctly. STOP and use a different backup method,
or contact us for assistance.
5. Verify that the ea.bak file has properly backed up your EA data on the MDS.
Without this EA data your backup is not useful. You can look at this file with "more"
or a text editor, and it should have an item for each file like:
# file: ROOT/mds_md5sum3.txt
trusted.lov0s0AvRCwEAAABXoKUCAAAAAAAAAAAAAAAAAAAQAAEAAADD5QoAAAAA
AAAAAAAAAAAAAAAAAAEAAAA=
6. Back up all filesystem data. Type:
tar czvf {backup file}.tgz
7. Change out of the mounted filesystem. Type.
cd -
8. Unmount the filesystem. Type:
umount /mnt/mds
Follow the same process on each of the OST device filesystems. The backup of the
EAs (described in Step 4), is not currently required for OST devices, but this may
change in the future.
To restore the file-level backup you need to format the device, restore the file data,
and then restore the EA data.
D-14 Lustre 1.6 Operations Manual • September 2008