[Lustre-discuss] quota problems in lustre 1.8

[Giacinto Donvito]

Hi All,

I'm experiencing some problem in a test installation of lustre 1.8.0.X

The installation is composed by one server hosting the MDS, and two servers
hosting the OSTs.
One of the servers has 12x2.7TB devices and the other has 16x2.3TB devices.

All the devices were configured with:

"tunefs.lustre --ost --mgsnode=lustre01 at tcp0 --param ost.quota_type=ug
--writeconf /dev/sdxx"

on the admin node I issued the "lfs quotacheck -ug /lustre" (I see read
operation occurring on the both disk servers) that ends without error.

I was able to set-up quotas per user on the admin node and it seems
successfully registered by checking with: "lfs quota -u donvito /lustre"

The problem that I see is that it is possible for a user to overfill the
quota as the two server behave differently: one of the two deny writing
while the other not.

I tried with both lustre rpms and vanilla (2.6.22) patched kernel and the
result is the same. It is not related to the physical server as both of them
sometimes has the same behaviour (But only one of the server at the time). I
have tried with both 1.8.0 and 1.8.0.1 and the same behaviour is observed.

As you can see the system is correctly accounting the used space but the
server do not deny writing:

[root at lustre01 ~]# lfs quota -u donvito /lustre
Disk quotas for user donvito (uid 501):
     Filesystem  kbytes   quota   limit   grace   files   quota   limit
grace
        /lustre 124927244* 12000000 15000000              24     100
100

The "messages" log on the MDS and both the OSS servers are clean and nothing
strange is noticeable.

Do you have any ideas of where I can look in order to understand the
problem?

Do you have any other suggestion of tests that I can do?

Thank you very much.

Best Regards,
Giacinto

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Giacinto Donvito    LIBI -- EGEE2 SA1 INFN - Bari ITALY
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