[Ocfs2-devel] [Ocfs2-users] How long for an fsck?

[Tao Ma]

Hi Josep,
	sorry, I don't subscribed to ocfs2-users after I left Oracle.
On 04/23/2011 08:22 AM, Sunil Mushran wrote:
> On 04/22/2011 03:24 PM, Josep Guerrero wrote:
>>> How long did the debugfs output take?
>> I think about 30 minutes. No more than 50 for sure (just by looking at the
>> times of the mails).
>>
>>> Did fsck eventually finish?
>> No. I had to cancel it after it stayed 24 hours in the same state, showing the
>> same message. It never moved beyond "Pass 0a", and always was using 100% CPU
>> in one core. I don't know if it would have finished on its own.
>>
>>> BTW, you said one of the cores was at 100%. What does top show?
>>> Is fsck the main contributor or is some other process spinning?
>> It was fsck (I kept a top opened the whole time, and fsck always was around
>> 99% CPU usage).
>>
>>> I have a theory as to why it is slow. But I would like some confirmation.
>>> My theory had fsck have high wait%. I seem to be missing something.
>> I didn't look at the wait%, but I checked the physical disk load with iotop
>> and it was very low, so it didn't look like fsck was being slow because of the
>> disk. In the filesystem I successfully "fscked" before (the 3 TB one that took
>> less than 60 minutes), it started doing something similar (very high CPU
>> usage, low disk load) but after several minutes (when the rest of the messages
>> after "Pass 0a" appeared), it did just the opposite: low CPU use, high disk
>> load. Both filesystems are physically on the same set of disks (the 16TB
>> logical volume is an striped LVM volume that fills about 75% of the 21 physical
>> disks and the 3TB is another striped LVM volume filling the remaining space of
>> the same disks) so I don't think it's a problem with the physical devices (of
>> course, I could be wrong).
> 
> File a bz. This will need some investigation.
> 
> BTW, how much memory does your box have?
So what is your version of fsck? I have met with some issue like that
when fsck is allocating a large number of memories and it stucks for
quite a long time of because of the swapping.

Regards,
Tao