Hi,
today I have tried the lssu on a dedicated server running nilfs and here
I had the following result:
fr ~ # lssu -a /dev/sda2 | grep -e "2009-" | grep -v -e "-d-"
2558 2009-03-23 16:59:05 --- 2048
4967 2009-03-28 09:07:10 ad- 1928
so I suppose corruption will soon occur here.
Is there something I can do to manually mark it as dirty or should I go
the backup/restore route ?
Thanks in advance
Bye,
David Arendt
Ryusuke Konishi wrote:
> Hi David,
> On Fri, 27 Mar 2009 15:20:05 +0900 (JST), Ryusuke Konishi wrote:
>
>> Hi,
>> On Fri, 27 Mar 2009 06:55:56 +0100, David Arendt <[email protected]> wrote:
>>
>>> Hi,
>>>
>>> one thing I forgot to mention, in /etc/nilfs_cleanerd.conf I changed
>>> n_segments_per clean to 20 in order to clean faster when running the
>>> cleaner manually. Could this have any influence ?
>>>
>> Yes, maybe. It raises memory pressure then may induce unusual path of
>> execution like cache invalidation. It may even increase the chance of
>> revealing underlying problems in relocation of on-disk blocks.
>>
>> Decreasing cleaning_interval is safer in general. We'll try the
>> condition.
>>
>> Regards,
>> Ryusuke
>>
>
> I examined the case of nsegments_per_clean = 20 and met an
> inconsistent state as follows:
>
> # lssu -a
> SEGNUM DATE TIME STAT NBLOCKS
> ...
> 7418 2009-03-27 18:41:33 -d- 2048
> 7419 2009-03-27 18:41:48 -d- 2048
> 7420 2009-03-27 18:42:08 -d- 2048
> 7421 2009-03-27 18:42:28 -d- 2048
> 7422 2009-03-27 18:42:48 --- 2048
> 7423 2009-03-27 18:43:03 --- 2048
> 7424 2009-03-27 18:43:23 -d- 2048
> 7425 2009-03-27 18:43:33 ad- 1166
> 7426 ---------- --:--:-- ad- 0
> 7427 ---------- --:--:-- --- 0
> ...
>
> Here, the segment 7422 and 7423 are in-use but not dirty.
>
> This is crucial because these segments will be reallocated and
> overridden later. I suspect there is a bug of error handling
> somewhere, and it evaporates the dirty flag and causes the crash.
>
> If you have a (not broken) nilfs partition made under heavy stress,
> could you try ``lssu -a'' likewise ?
>
> I'll dig into this from now.
>
> Regards,
> Ryusuke Konishi
>
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