[Ocfs2-users] Ocfs2-users Digest, Vol 116, Issue 4

[Sridhar Avantsa]

Sridhar Avantsa

savantsa at gmail.com
 On Aug 7, 2013 3:02 PM, <ocfs2-users-request at oss.oracle.com> wrote:

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>    1. Re: OCFS2 tuning, fragmentation and localalloc option.
>       Cluster hanging during mix read+write workloads (Goldwyn Rodrigues)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 06 Aug 2013 20:21:19 -0500
> From: Goldwyn Rodrigues <rgoldwyn at suse.de>
> Subject: Re: [Ocfs2-users] OCFS2 tuning, fragmentation and localalloc
>         option. Cluster hanging during mix read+write workloads
> To: Gavin Jones <gjones at where2getit.com>
> Cc: ocfs2-users at oss.oracle.com
> Message-ID: <5201A10F.3050307 at suse.de>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Gavin,
>
> On 08/06/2013 04:51 PM, Gavin Jones wrote:
> > Hello Goldwyn,
> >
> > Thanks for taking a look at this.  So, then, it does seem to be DLM
> > related.  We were running fine for a few weeks and then it came up
> > again this morning and has been going on throughout the day.
> >
> > Regarding the DLM debugging, I allowed debugging for DLM_GLUE,
> > DLM_THREAD, DLM_MASTER and DLM_RECOVERY.  However, I don't see any DLM
> > logging output in dmesg or syslog --is there perhaps another way to
> > get at the actual DLM log?  I've searched around a bit but didn't find
> > anything that made it clear.
>
> Unfortunately CONFIG_OCFS2_DEBUG_MASKLOG is not enabled for opensuse
> kernels but for SLES kernels only. Sorry about that :(
>
> However, you can recompile the kernel with this enabled in the config file.
>
> >
> > As for OCFS2 and iSCSI communications, they use the same physical
> > network interface but different VLANs on that interface.  The
> > "connectionX:0" errors, then, seem to indicate an issue with the ISCSI
> > connection.  The system logs and monitoring software don't show any
> > warnings or errors about the interface going down, so the only thing I
> > can think of is the connection load balancing on the SAN, though
> > that's merely a hunch.  Maybe I should mail the list and see if anyone
> > has a similar setup.
>
> You will not have anything in the logs if the network issues are
> intermittent. Perhaps a simple ping when the issue is occurring is the
> best tool.
>
> My doubts on network issues keep getting stronger by the information you
> have given me so far. Also, as Sunil mentioned, you have a problem if
> the storage does not respond anyways.
>
> >
> > If you could please point me in the right direction to make use of the
> > DLM debugging via debugs.ocfs2, I would appreciate it.
> >
>
> <snipped>
>
> --
> Goldwyn
>
>
>
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> End of Ocfs2-users Digest, Vol 116, Issue 4
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