[Lustre-discuss] move ost in a new oss

[Brian J. Murrell]

On Mon, 2009-11-02 at 21:29 +0100, Antonio Concas wrote: 
> Hi all,

Hi,

> i'm using lustre 1.8.1.1 with 4 OSS each of which mounts 10 ost ,

Wow.  10 OSTs.  These OSSes have lots of memory, right?  With 10 OSTs,
you have 4G of memory being used just for journals.

> i'm trying to use 2 more OSS, and i'd like to move some ost already in 
> use in the new oss.

Are you actually relocating or just expanding?  (i.e. will the OSTs on
the existing OSSes remain?)  Or is your hope to reduce the per OSS OST
count by adding more OSSes and keeping the OST count the same and just
point LUNS at new OSSes?

If you are expanding, I'd just create the new OSTs and start doing some
"poor mans rebalanceing" to move files on to the new OSTs.

If you are doing the latter and just creating more OSSes for existing
OSTs, then you will need to follow the procedure in the manual for
changing a NID.

b.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: This is a digitally signed message part
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20091102/88f698ee/attachment.pgp>