Lustre discuss - May 2006 - how to add new OST to current runing cluster?

Gentoo wrote:
> Hi all
> I have a running lustre cluster which has 1 OST, 1 MDS, 10 client. I am 
> going to add more OST into it, but I have no idea
> about how to add ost without impaction to current cluster.
> 
> thanks for your help.
Hopefully, you have built your configuration with a script.
-Add the new OST _after the first OST.
-Recreate your XML file
- unmount clients
-Stop Lustre
- On the MDS, ''# lconf --write_conf <XML file>''
- On the new (and _only the new) OST run ''# lconf --reformat <XML
file>''
- Restart Lustre.
- mount clients

These no way to do this currently without stopping Lustre.
cliffw
> 
> -- 
> Life is hard
> 
> 
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On May 14, 2006  21:19 -0700, Cliff White wrote:
> Gentoo wrote:
> >Hi all
> >I have a running lustre cluster which has 1 OST, 1 MDS, 10 client. I am
> >going to add more OST into it, but I have no idea
> >about how to add ost without impaction to current cluster.
> >
> >thanks for your help.
> 
> Hopefully, you have built your configuration with a script.
> -Add the new OST _after the first OST.
> -Recreate your XML file
> - unmount clients
> -Stop Lustre
> - On the MDS, ''# lconf --write_conf <XML file>''
> - On the new (and _only the new) OST run ''# lconf --reformat
<XML file>''
Note that if the two OSTs are on the same node you will need to be very
careful here.  You can use "lconf --reformat --service {name of OST}
{xml}"
to limit this operation to the specified service.  Alternately, you can
format the OST disk by hand:

	mke2fs -j -J size=400 -O dir_index -I 256 -i 65536 /dev/whatever

"-i 65536" reduces the number of inodes on the OST, 65536 is bytes and
relates to the average file size, can be higher if you have large files.
> - Restart Lustre.
> - mount clients
> 
> These no way to do this currently without stopping Lustre.
FYI - in lustre 1.6 this will be possible while the filesystem is mounted.

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

Hi all
I have a running lustre cluster which has 1 OST, 1 MDS, 10 client. I am
going to add more OST into it, but I have no idea
about how to add ost without impaction to current cluster.

thanks for your help.

-- 
Life is hard
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