Lustre discuss - Mar 2012 - Problem with 1.8 -> 2.1 migration and root_squash

Hello all,

We have been (happily) using a lustre 1.8 installation for some time 
now. However, due to a recent acquisition of some Interlagos client 
nodes, we have been forced to install ScientificLinux 6.2 (a clone of 
RHEL 6.2) in order to fully support the new features.

As we found some installation problems with the latest kernel, and 
didn''t seem to be a commitment to fully support this configuration, we 
chose to migrate all our infrastructure to newest lustre 2.1, which was 
supposed to be a clear migration path.

However, we found a problem im our MDS which prevented mounting it with 
the new version:


Mar  7 20:03:35 mds01 kernel: LustreError: 
6610:0:(obd_config.c:1140:class_process_proc_param()) home-MDT0000: 
unknown param rootsquash=99:99
Mar  7 20:03:35 mds01 kernel: LustreError: 
6610:0:(obd_config.c:1361:class_config_llog_handler()) Err -38 on cfg 
command:
Mar  7 20:03:35 mds01 kernel: Lustre:    cmd=cf00f 0:home-MDT0000  
1:mdt.rootsquash=99:99
Mar  7 20:03:35 mds01 kernel: LustreError: 15c-8: MGC172.16.4.3 at tcp: The 
configuration from log ''home-MDT0000'' failed (-38). This may
be the
result of communication errors between this node and the MGS, a bad 
configuration, or other errors. See the syslog for more information.
Mar  7 20:03:35 mds01 kernel: LustreError: 
6124:0:(obd_mount.c:1192:server_start_targets()) failed to start server 
home-MDT0000: -38
Mar  7 20:03:35 mds01 kernel: LustreError: 
6124:0:(obd_mount.c:1723:server_fill_super()) Unable to start targets: -38
Mar  7 20:03:35 mds01 kernel: Lustre: Failing over home-MDT0000

We were able to overcome this using tunefs.lustre --writeconf. However, 
when we try to enable root squash again, we still get errors (we also 
tried without the underscore, just in case, and the results are exactly 
the same):

[root at mds01 ~]# lctl conf_param home.mds.root_squash="99:99"
Make sure cfg_device is set first.
error: conf_param: Function not implemented

In the message logs we see:

Mar 12 13:07:28 mds01 kernel: Lustre: Ignoring unrecognized param 
''mds.root_squash=99:99''
Mar 12 13:07:28 mds01 kernel: LustreError: 
9959:0:(mgs_handler.c:970:mgs_iocontrol()) setparam err -38

Is it a bug in the way Lustre 2.1 handles old metadata? How should we 
re-enable root squash in our scenario?

Thanks in advance,

Joan


-- 
  --------------------------------------------------------------------------
Joan Josep Piles Contreras -  Analista de sistemas
I3A - Instituto de Investigaci?n en Ingenier?a de Arag?n
Tel: 976 76 10 00 (ext. 5454)
http://i3a.unizar.es -- jpiles at unizar.es
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On 12-03-12 08:04 AM, Joan J. Piles wrote:
> 
> [root at mds01 ~]# lctl conf_param home.mds.root_squash="99:99"
Looking at the code that tests that functionality, can you try replacing
"mds" in your "lctl conf_param" command with
"mdt"?  So:

# lctl conf_param home.mdt.root_squash="99:99"

Cheers,
b.

-- 
Brian J. Murrell
Senior Software Engineer
Whamcloud, Inc.

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It worked, thank you very much.

Perhaps it would be useful to update the manual:

http://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.html#dbdoclet.50438221_64726

Thanks,

Joan

El 12/03/12 13:56, Brian J. Murrell escribi?:
> On 12-03-12 08:04 AM, Joan J. Piles wrote:
>> [root at mds01 ~]# lctl conf_param
home.mds.root_squash="99:99"
> Looking at the code that tests that functionality, can you try replacing
> "mds" in your "lctl conf_param" command with
"mdt"?  So:
>
> # lctl conf_param home.mdt.root_squash="99:99"
>
> Cheers,
> b.
>
>
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss

-- 
--------------------------------------------------------------------------
Joan Josep Piles Contreras -  Analista de sistemas
I3A - Instituto de Investigaci?n en Ingenier?a de Arag?n
Tel: 976 76 10 00 (ext. 5454)
http://i3a.unizar.es -- jpiles at unizar.es
--------------------------------------------------------------------------

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On 12-03-12 09:42 AM, Joan J. Piles wrote:
> It worked, thank you very much.
Ahh.  Glad it worked.
> Perhaps it would be useful to update the manual:
Indeed.  Could you please file a ticket at bugs.whamcloud.com?

Thanks,
b.

-- 
Brian J. Murrell
Senior Software Engineer
Whamcloud, Inc.

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