[Ocfs2-users] OCFS2 Panic!

[Peter Sylvester]

Sunil,

Can you expand upon this explanation a bit?
What kind of I/O (disk, network, etc) are we talking about here, and 
under what conditions could it possibly take 12 seconds?
Disk I/O service time should be around 10ms for these (10K RPM SCSI) drives.
Remember that this is a single note cluster, managing locally attached 
disk, so it should only be talking to itself.

thanks,
Peter Sylvester

Sunil Mushran wrote:
> 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.
>>
>> _______________________________________________
>> Ocfs2-users mailing list
>> Ocfs2-users at oss.oracle.com
>> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>