[Lustre-discuss] [Fwd: Re: erroneous ENOSPC -28]

Christian Becker christian.becker at math.tu-dortmund.de
Mon Apr 23 08:57:01 PDT 2012

Kevin Van Maren wrote:
> There is information in that bug; have you looked at the tot_granted
> and compared it to the sum on the cur_grant_bytes?
> The workaround, until you upgrade, was to restart the OSTs to reset the grant.
> Kevin

Our vendor gave us a workaround for this bug to increase the time in
which the client will shrink the granted space. The default value is 20
minutes, to prevent the grant space from going out of sync again you can
increase this value to a higher one via the following command (on mgs
server for every OST):

lctl conf_param $FSNAME-OST0000.osc.grant_shrink_interval=63072000
(replace FSNAME with the name of your filesystem)

First you have to reboot at least all clients and (better) all servers.
This workaround works well for us.

best regards,

> On Apr 23, 2012, at 9:18 AM, Gretchen Zwart wrote:
>> Hi,
>> Debian 5.0
>> 2.6.26-2-amd64 SMP (SLES 11)
>> Lustre
>> Lustre clients are getting ENOSPC -28 error messages but 'lfs df'
>> results indicate that OSTs are no more than 50% full. This looks like
>> it could be related to Bug 22755.
>> What is the best way to nail down if this is the cause? I'm in the
>> upgrade process, but I'd also like to know what is the fastest/best
>> method to restore lustre functionality should I encounter this again.
>> Regards,
>> -- 
>> Gretchen Zwart
>> UMass Astronomy Dept. 619E Lederle
>> 710 North Pleasant ST
>> Amherst,MA 01003
>> (413) 577-2108
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
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