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@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@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
--
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Joan Josep Piles Contreras - Analista de sistemas
I3A - Instituto de Investigación en Ingeniería de Aragón
Tel: 976 76 10 00 (ext. 5454)
http://i3a.unizar.es -- [email protected]
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