[Lustre-discuss] Migrating MDT volume to a new location

Ashley Pittman apittman at ddn.com
Wed Feb 2 11:02:14 PST 2011


On 2 Feb 2011, at 17:15, Bob Ball wrote:

> Is there a recommended way to migrate an MDT (MGS is separate) volume 
> from one location to another on the same server?  This uses iSCSI volumes.
> 
> Lustre 1.8.4

If using LVM it's possible to do this entirely at the LVM layer without interrupting the filesystem, I wouldn't recommend it without first taking a backup though.

The commands used for this are pvcreate, vgextend, pvmove, vgreduce and pvremove.

If using tar make sure you do a test run first, we've found several bugs with tar recently that lead to errors.

https://bugzilla.redhat.com/show_bug.cgi?id=656834

Ashley.


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