[Lustre-discuss] OST balancing (1.6) question

[Andreas Dilger]

On Mar 04, 2008  09:18 +0000, Daire Byrne wrote:
> We have a mix of 1.4 and 1.6 clients and so when we recently expanded
> one of our filesystems...

> My question is if we have 1.6 clients will they try to balance OST space
> no matter what or do they have to mount the filesystem using the "mgs"
> (1.6) mount method to enable this feature? If they use the old (1.4) mount
> command format will they just round-robin writes like a 1.4 client would?

The space balancing is purely a feature of the MDS, the clients have
nothing to do with object allocation in 1.4 or 1.6, so you should be
fine if you are running any version of Lustre 1.6 on the MDS.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.