Lustre discuss - Mar 2007 - Transferring data from one OST to another

Hi all,
I have a one active MDS and 6 OSS(each serving one OST) with no failover
support.
Everything was working fine but now one of the OSS node is having machine
failures very often and hence lustre fs
gets offline.What I want is to shift the data from failing OSS''s OST to
another machine who will then serve as the new replaced OSS
without disturbing the previous data.So can I copy the data from the OST
device(say /dev/sda7 ) in raw mode to another machines some partition and
change the configuration in the xml file and start serving.
Is it possible


-- 
Regards--
Rishi Pathak
National PARAM Supercomputing Facility
Center for Development of Advanced Computing(C-DAC)
Pune University Campus,Ganesh Khind Road
Pune-Maharastra
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On Mar 06, 2007  17:18 +0530, rishi pathak wrote:
> I have a one active MDS and 6 OSS(each serving one OST) with no failover
> support.
> Everything was working fine but now one of the OSS node is having machine
> failures very often and hence lustre fs
> gets offline.What I want is to shift the data from failing OSS''s
OST to
> another machine who will then serve as the new replaced OSS
> without disturbing the previous data.So can I copy the data from the OST
> device(say /dev/sda7 ) in raw mode to another machines some partition and
> change the configuration in the xml file and start serving.
Yes.  There is a KB entry in bugzilla that describes this.  Search for
"backup".  If you are moving the OST to another machine you also need
to run "lconf --write-conf {config}.xml" on the mds.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.