[Lustre-discuss] Questions concerning quotacheck.

[Theodoros Stylianos Kondylis]

Thank you for your answer,

About the results quotacheck gives.

In our production system we are using v1.8.4 and we have enabled the quotas
per user and group. So I tried the following commands for a specific group
and its users ::

# lfs quota -g group_name /lustre/
Disk quotas for group group_name (gid 8863):
     Filesystem  kbytes              quota                limit
     grace   files        quota      limit         grace
     /lustre/        44291610536  104857600000 104910028800 -
 176573  2000000 2200000  -

# lfs quota -u user5 /lustre/
Disk quotas for user user5 (uid 7511):
     Filesystem  kbytes                  quota   limit   grace   files
 quota  limit   grace
     /lustre/        32131767752       0         0        -          65139
  0        0       -

# lfs quota -u user2 /lustre/
Disk quotas for user user2 (uid 8874):
     Filesystem  kbytes                  quota limit   grace   files
quota limit   grace
     /lustre/        12159883112       0       0       -           112054 0
       0       -

# lfs quota -u user3 /lustre/
Disk quotas for user user3 (uid 8875):
     Filesystem  kbytes  quota limit   grace files quota  limit   grace
     /lustre/        152       0       0       -         5     0         0
      -

# lfs quota -u user1 /lustre/
Disk quotas for user user1 (uid 8873):
     Filesystem kbytes quota limit grace files quota limit grace
     /lustre/       68       0        0      -        5     0        0
 -

# lfs quota -u user0 /lustre/
Disk quotas for user user0 (uid 8864):
     Filesystem kbytes quota limit grace files quota limit grace
     /lustre/       4          0        0     -        1     0         0
  -

# lfs quota -u user4 /lustre/
Disk quotas for user user4 (uid 8890):
     Filesystem kbytes quota limit grace files quota limit grace
     /lustre/       4          0        0     -        1     0         0
  -

# lfs quota -u user6 /lustre/
Disk quotas for user user6 (uid 8037):
     Filesystem kbytes quota limit grace files quota limit grace
     /lustre/       4          0        0     -        1     0         0
  -

# lfs quota -u user7 /lustre/
Disk quotas for user user7 (uid 9319):
     Filesystem kbytes quota limit grace files quota  limit grace
     /lustre/       4          0       0      -        1     0         0
   -


But when I accumulated all the users amount of files that was larger of the
group's amount of files ::

176573 -(65139 +112054 +5 +5 +1 +1 +1 +1) = -634

Respectively there was a difference on the amount of kB.

Shouldn't the accumulated quotas be the same for the group and its users?

Does this mean that the quotas are not coherent and I have to run
quotacheck again?

Thank you in advance for any reply/guidance,
Stelios.


On Wed, Jan 23, 2013 at 8:10 AM, Adrian Ulrich <adrian at blinkenlights.ch>wrote:

> Hi,
>
>
> > But apart from that, when else is quotaceck required? For example is
> there
> > any case where the quotas will not be coherent? And have to run
> quotacheck
> > again in order to recheck them?
>
> Lustre versions prior to 1.6.5 required you to run quotacheck after server
> crashes.
> Recent versions (1.8, 2.x) use journaled quotas and will survive crashes
> just fine.
>
> We are running Lustre 1.8 and 2.2 servers and i never had to re-run
> quotacheck on them.
>
>
>
> > Secondly, inside the operations manual v1.8.4 section 9.1.2 it states
> that
> > the required time for quotacheck to complete its task, is proportional to
> > amount of files in the fs. So is there a practical way to get an
> indication
> > of the amount of time quotacheck will need?
>
> I can't give you exact timings (or a formula) but it's pretty fast:
>
> We enabled quotas on our 1.8.x system while about 100TB were already used.
> (Medium sized files). The initial `quotacheck' run finished within 30
> minutes.
>
>
>
> Regards,
>  Adrian
>
>
> --
>  RFC 1925:
>    (11) Every old idea will be proposed again with a different name and
>         a different presentation, regardless of whether it works.
>
>
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