[Linux-cluster] GFS + DRBD Problems

[Bryn M. Reeves]

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gordan at bobich.net wrote:
> On Mon, 3 Mar 2008, gordan at bobich.net wrote:
> 
>> I have a 2-node cluster with Open Shared Root on GFS on DRBD. A single
>> node mounts GFS OK and works, but after a while seems to just block
>> for disk.
> [...]
> State:  D (disk sleep)
> SleepAVG:       97%
> [...]

You can find out what it's sleeping on either by via a sysrq or by
getting ps to display the wchan field of the stat data, e.g.:

ps ac -opid,comm,wchan

And see what symbol appears in the 3rd field.

For sysrq, just echo t > /proc/sysrq-trigger

Then look in dmesg & find the stacktrace for the process you're
interested in.

Regards,
Bryn.

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