[Lustre-discuss] mgt backup

[Cliff White]

John White wrote:
> I just wanted to confirm that the backup/restore procedure for MDTs apply equally to MGTs.  Can someone please confirm?

Actually, the only things kept on a dedicated MGT are config logs.
Should be a trivial task to backup. mount as ldiskfs and make a quick 
tarball. You don't have to stop the filesystem to umount MGT.

# ls -Rl /mnt/mgs
/mnt/mgs:
total 20
drwxrwxrwx 2 root root  4096 Mar 18 10:46 CONFIGS
drwx------ 2 root root 16384 Mar 17 11:08 lost+found

/mnt/mgs/CONFIGS:
total 60
-rw-r--r-- 1 root root 12288 Mar 17 11:08 mountdata
-rw-r--r-- 1 root root 11688 Mar 17 11:10 test1-client
-rw-r--r-- 1 root root 12144 Mar 17 11:10 test1-MDT0000
-rw-r--r-- 1 root root  8880 Mar 18 10:46 test1-OST0000
-rw-r--r-- 1 root root  8880 Mar 18 10:46 test1-OST0001


If it's at combined MGT/MDT, then use the MDT procedure.
cliffw


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> John White
> High Performance Computing Services (HPCS)
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> Lawrence Berkeley National Lab
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