Lustre 1.6 Operations Manual

13.2.5 Upgrading Multiple File Systems with a Shared
MGS
The upgrade order is: MGS first, then for any single file system the MDT must be
upgraded and mounted, and then the OSTs for that file system. If the MGS is
co-located with the MDT, the old configuration logs stored on the MDT are
automatically transferred to the MGS. If the MGS is not co-located with the MDT
(for a site with multiple file systems), the old config logs must be manually
transferred to the MGS.
1. Format the MGS node, but do not start it.
mgsnode# mkfs.lustre --mgs /dev/hda4
2. Mount the MGS disk as type ldiskfs.
mgsnode# mount -t ldiskfs /dev/hda4 /mnt/mgs
3. For each MDT, copy the MDT and client startup logs from the MDT to the
MGS, renaming them as needed. There is a script that helps automate this
process—lustre_up14.sh
mdt1# lustre_up14 /dev/hda4 lustre
debugfs 1.35 (28-Feb-2004)
/dev/hda4: catastrophic mode - not reading inode or group bitmaps
Copying log 'mds-1' to 'lustre-MDT0000'. Okay [y/n]?y
Copying log 'client' to 'lustre-client'. Okay [y/n]?y
ls -l /tmp/logs
total 24
-rw-r--r-- 1 root root 9448 Oct 22 17:46 lustre-client
-rw-r--r-- 1 root root 9080 Oct 22 17:46 lustre-MDT0000
mdt1# cp /tmp/logs/lustre-* /mnt/tmp/CONFIGS/
cp: overwrite `/mnt/tmp/CONFIGS/lustre-client'? y
cp: overwrite `/mnt/tmp/CONFIGS/lustre-MDT0000'? y
4. Unmount the MGS ldiskfs mount.
mgsnode# umount /mnt/mgs
5. Start the MGS.
mgsnode# mount -t lustre /dev/hda4 /mnt/mgs
6. Shut down one of the old MDTs.
mdt1# lconf --failover --cleanup config.xml
Chapter 13 Upgrading Lustre 13-7