Lustre 1.6 Operations Manual

15.1.3.1 Backing Up an MDS File
To back up a file on the MDS:
1. Make a mount point for the file system "mkdir /mnt/mds" and mount the file
system at that location.
■ For 2.4 kernels, run:
■
mount -t ext3 {dev} /mnt/mds
For 2.6 kernels, run:
mount -t ldiskfs {dev} /mnt/mds
2. Change to the mount point being backed up "cd /mnt/mds"
3. Back up the EAs, run:
getfattr -R -d -m '.*' -P . > ea.bak
Note – The getfattr command is part of the "attr" package in most distributions.
If the getfattr command returns errors like Operation not supported, then
the kernel does not correctly support EAs. STOP and use a different backup method
or contact us for assistance.
4. Verify that the ea.bak file has properly backed up the EA data on the MDS.
Without this EA data, the backup is not useful. Look at this file with "more" or
a text editor. It should have an item for each file like:
# file: ROOT/mds_md5sum3.txt
trusted.lov=
0s0AvRCwEAAABXoKUCAAAAAAAAAAAAAAAAAAAQAAEAAADD5QoAAAAAAAAAAAAAAAA
AAAAAAAEAAAA=
5. Back up all filesystem data, run:
tar czvf {backup file}.tgz
6. Change directory out of the mounted filesystem, run:
cd -
7. Unmount the filesystem, run:
umount /mnt/mds
Chapter 15 Backup and Restore 15-3