[Pvfs2-developers] Changing the number of I/O servers

[Phil Carns]

Hi Christina,

Thanks for trying out those test cases.  That narrowed down the problem 
quite a bit.

I think the attached patch fixes the problem.  This has also been 
committed to cvs head.

thanks,
-Phil

Christina Patrick wrote:
> Hi Rob,
> 
> Thank you very much for your help,
> 
> Regards,
> Christina.
> 
> On Wed, Jul 15, 2009 at 3:31 PM, Christina
> Patrick<christina.subscribes at gmail.com> wrote:
>> Hi,
>>
>> I tried the pvfs2-cp command and here are the results:
>> ----------------------------------------
>> $ pvfs2-cp -n 1 /home/mdl/patrick/pvfs2/oneserver /home/mdl/patrick/pvfs2/s1
>> $ pvfs2-viewdist -f /home/mdl/patrick/pvfs2/s1
>> dist_name = simple_stripe
>> dist_params:
>> strip_size:65536
>>
>> Metadataserver: tcp://aum14:7000
>> Number of datafiles/servers = 3
>> Datafile 0 - tcp://aum14:7000, handle: 6917529027641081849
>> (5ffffffffffffff9.bstream)
>> Datafile 1 - tcp://aum15:7000, handle: 9223372036854775300
>> (7ffffffffffffe04.bstream)
>> Datafile 2 - tcp://aum13:7000, handle: 4611686018427387652
>> (3fffffffffffff04.bstream)
>> ----------------------------------------
>> $ pvfs2-cp -n 2 /home/mdl/patrick/pvfs2/oneserver /home/mdl/patrick/pvfs2/s2
>> $ pvfs2-viewdist -f /home/mdl/patrick/pvfs2/s2
>> dist_name = simple_stripe
>> dist_params:
>> strip_size:65536
>>
>> Metadataserver: tcp://aum14:7000
>> Number of datafiles/servers = 2
>> Datafile 0 - tcp://aum14:7000, handle: 6917529027641081848
>> (5ffffffffffffff8.bstream)
>> Datafile 1 - tcp://aum13:7000, handle: 4611686018427387397
>> (3ffffffffffffe05.bstream)
>> ----------------------------------------
>>
>> It seems that the striping does not work only when we specify *one*
>> server as input (but apparently works if you specify anything other
>> than one).
>> Since I have only 3 I/O servers configured currently, this is all I could try.
>> I also tried my program with 2 I/O servers and it worked as shown above.
>>
>> Thanks and Regards,
>> Christina.
>>
>> On Wed, Jul 15, 2009 at 2:42 PM, Rob Latham<robl at mcs.anl.gov> wrote:
>>> On Wed, Jul 15, 2009 at 02:26:07PM -0400, Christina Patrick wrote:
>>>> Hi Rob,
>>>>
>>>> I am willing to try it out. However, I don't know how to do so using pvfs2-cp.
>>>> Sorry to trouble you, but could you please tell me how to do it.
>>> No problem.   Find some large-ish file (about 1MB should do) and copy
>>> it to your pvfs volume like so:
>>>
>>> /usr/local/pvfs2/bin/pvfs2-cp -n 1 <src> /pvfs/mountpoint/dir/<dest>
>>>
>>> and try that also with a few different values of -n
>>>
>>> ==rob
>>> --
>>> Rob Latham
>>> Mathematics and Computer Science Division
>>> Argonne National Lab, IL USA
>>>
> 
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