[Ocfs2-users] Catatonic nodes under SLES10

[Sunil Mushran]

Patches are welcome. :)

Alexei_Roudnev wrote:
> If I know, that FS was not active for the last (for example) 30 seconds, and
> all buffers are written back more than 30 secoinds ago, I DO KNOW that there
> is not any IO in the pipelines.
>
> At least it can be configurable. 30 seconds - ok, may be default is 2
> minutes - some timeout is more then enough. Each scsi system have it's own
> time, after which you can say for sure that iut have not any IO in the
> pipeline. On the other hand, system reboot dont prevent ALL possible IO
> pending as well.
>
>
>
>
> ----- Original Message ----- 
> From: "Joel Becker" <Joel.Becker at oracle.com>
> To: "Eckenfels. Bernd" <B.Eckenfels at seeburger.de>
> Cc: <ocfs2-users at oss.oracle.com>
> Sent: Tuesday, April 10, 2007 10:19 AM
> Subject: Re: [Ocfs2-users] Catatonic nodes under SLES10
>
>
>   
>> On Tue, Apr 10, 2007 at 07:06:02PM +0200, Eckenfels. Bernd wrote:
>>     
>>>> It's not at all about what your past activitiy was like. We fence to
>>>>         
>>> prevent future activity.
>>>
>>> There is a lot you can do instead, including SCSI plugging the device o
>>> just setting a RO flag in the filesystem (remount-ro-on-error style).
>>> There might be times when it is needed to shoot the node in the head,
>>> but those are not handled by the self-panic anyway...
>>>       
>> By the time you determine you need a node to fence, you do not
>> know what I/O it has in its pipeline.  Any I/O that is below the request
>> queue can't reliably be stopped in Linux.  If that I/O goes out after
>> other nodes have decided the node is gone, it is corruption.  This is
>> why fencing has to be absolute.
>>
>> Joel
>>
>> -- 
>>
>> "War doesn't determine who's right; war determines who's left."
>>
>> Joel Becker
>> Principal Software Developer
>> Oracle
>> E-mail: joel.becker at oracle.com
>> Phone: (650) 506-8127
>>
>> _______________________________________________
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>>
>>     
>
>
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