[Pvfs2-users] Is there a way to prevent MPI-ROMIO access?

[Sam Lang]

On Aug 31, 2007, at 11:55 AM, Bill Wichser wrote:

> Murali,
>
> Thanks, that's the right command.  Now that I see it I even  
> remember using it in the past, wrapped around the pvfs2-fsck!
>
> We actually have a system reservation set for Monday morning so  
> once the jobs in the queue trickle down, we'll be able to start the  
> fsck.

pvfs2-fsck sets the admin mode before running, and puts it back to  
normal mode once its done.
-sam

>
> Bill
>
> Murali Vilayannur wrote:
>> Hi Bill,
>> One way to do this is to switch the server to admin mode. I think you
>> can do that using pvfs2-set-mode in src/apps/admin.
>> After that the server won't take regular requests I think..
>> I don't know if the fsck app already does that..You will of course
>> need to switch the mode back after the fsck finishes...
>> It has been a while since I looked at that code.. so I could be  
>> wrong.. :)
>> It would be best if you ask all users to kill their jobs before  
>> running fsck..
>> Online fsck is probably going to cause a lot of grief if users are
>> actively using
>> the volume...
>> thanks,
>> Murali
>> On 8/31/07, Bill Wichser <bill at princeton.edu> wrote:
>>> We'd finally like to run an fsck to try and clean up our pvfs2
>>> filesystem (see my previous post about kernel crashes) but are  
>>> concerned
>>> about users' jobs still accessing the filesystem while we are  
>>> running
>>> these checks.
>>>
>>>  From the kernel interface, this is easy, we simply disable the  
>>> kernel
>>> module.  The other method though, direct access via the API/MPI- 
>>> ROMIO,
>>> remains an issue.  Is there some method we can use to disable access
>>> through this interface?  Or can we just run the fsck without  
>>> worrying
>>> about this?
>>>
>>> Thanks,
>>> Bill
>>> _______________________________________________
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>>> Pvfs2-users at beowulf-underground.org
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>>>
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