[Lustre-discuss] Removing an OST
adilger at sun.com
Mon Jan 19 14:55:17 PST 2009
On Jan 19, 2009 10:18 +0100, Heiko Schroeter wrote:
> Is it possible to get these infos into the documentation as it may hit one or
> the other in the lustre community ?
Yes, we always welcome improvements to the documentation. As you can
imagine, I rarely need to reference the documentation myself, so I don't
know whether it is up-to-date or not, or if it explains a given topic
clearly enough or not.
> The manual only gives two 'general' approaches one of which is to 'deactivate
> the OST', the other one just says to remount the partition with "ext3" which
> didn't work for the lustre partitions here.
> Maybe something like (if it is correct):
> Removing/Replacing an OST with recreating the files into lustre:
> Deactivate the OST for the MDS only, using 'set_param' instead
> of 'config_param', so clients are able to read the data. i.e:
> > lctl set_param foo-OST000d-osc.active=0
This should be "lctl set_param osc.foo-OST000d-osc.active=0
> Copy the data on a client to a temp storage outside (does it has to be
> outside?) the lustre system and 'move' them back into lustre to create new
> inodes entries on the MDS.
Actually, it should NOT be on storage outside Lustre in this case.
> > cp .../dat.file .../dat.file.tmp
> > mv .../dat.file.tmp .../dat.file
> After moving all files the OST can be permantly set inactive with.i.e.:
> > lctl config_param foo-OST000d-osc.active=0
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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