[Lustre-discuss] Random OST Numbers chosen in a stripe

[Johann Lombardi]

On Fri, Jul 29, 2011 at 04:49:28PM -0400, Roger Spellman wrote:
> For a different file:
> 
>    obdidx           objid          objid            group
>      13            6884         0x1ae4                0
>      28            6880         0x1ae0                0
>      44            6880         0x1ae0                0
>      27            6880         0x1ae0                0
> 
> Why is this?
> 
> How can I control it to always be sequential?

It depends on the OST usage imbalance and you can tune the stripe allocation policy with qos_threshold_rr. For more information, please refer to the lustre manual:
http://wiki.lustre.org/manual/LustreManual20_HTML/LustreProc.html#50438271_pgfId-1296529

Cheers,
Johann
-- 
Johann Lombardi
Whamcloud, Inc.
www.whamcloud.com