[Ocfs2-users] OCFS2 Panic!

[Sunil Mushran]

What this means is that the hb thread was unable to complete an io
for 12 secs and was forced to fence the node.

One solution is to increase this threshold time by specifying
it in /etc/sysconfig/o2cb.

O2CB_HEARTBEAT_THRESHOLD = 14

The default value is 7 will results in 12 secs.
(O2CB_HEARTBEAT_THRESHOLD - 1) * 2 secs

Setting it to 14 will make it 26 secs.

Peter Sylvester wrote:

> System config:
>
> Dell PE2850 server
> (4) 36GB SCSI drives in (onboard) RAID-5
>
> RHEL4-U2
> Dell ATI Video Driver update 10/2005
>
> ocfs2-2.6.9-22.ELsmp-1.0.7-1.i686.rpm
> ocfs2-tools-1.0.2-1.i386.rpm
> ocfs2console-1.0.2-1.i386.rpm
>
> Note that this is a single node cluster, nothing else 
> installed/running except iozone.
>
> I was running some "iozone" tests on the OCFS2 volume for about a day, 
> and the system locked up completely.
> The following messages were transcribed from the console (nothing 
> written to /var/log/messages):
>
> usb4-2: device not accepting address 4, error -71
> (11,1): o2hb_write_timeout: 164 ERROR: heartbeat write timeout to 
> device sda6 after 12000 miliseconds
> (11,1): o2hb_stop_all_regions: 1724 ERROR: stopping heartbeat on all 
> active regeons
> Kernel Panic - not syncing: ocfs2 is very sorry to be fencing the 
> system by panicing
>
> Questions:
> What does all this mean?
> Why is nothing getting written to /var/log/messages?
> If this software really ready for prime time (honestly...)?
>
> thanks,
> Peter Sylvester
> MITRE Corp.
>
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