Originally posted by: j.gann

Hi,

I am new to GPFS and wonder if there is a general performance penalty for i/o on a gpfs filesystem compared to i/o on a local filesystem. Both being based on the same storage technology (say DS8000). Am I right to expect a somewhat lower i/o bandwidth on gpfs because of the remote mirroring?

thanks in advance
joachim
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Originally posted by: esv

> j.gann wrote:
> Hi,
>
> I am new to GPFS and wonder if there is a general performance penalty for i/o on a gpfs filesystem compared to i/o on a local filesystem. Both being based on the same storage technology (say DS8000). Am I right to expect a somewhat lower i/o bandwidth on gpfs because of the remote mirroring?
>
> thanks in advance
> joachim

first, there is a dedicated GPFS forum, you might find more help there (http://www.ibm.com/developerworks/forums/forum.jspa?forumID=479&start=0)

Now, why would you like to mirror an already protected data (Ds8000 formats disk packs into RAID5 or RAID10 groups before creating the LUNs?

I've read that some people migrate to GPFS on a single node because it is faster than JFS2, I don't have references but you could check with the IBM GPFS Competency group.

For more information, you can check the GPFS Section on the HPC Wiki at :
http://www.ibm.com/developerworks/wikis/display/hpccentral/General+Parallel+File+System+(GPFS)

and the GPFS FAQ:
http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp?topic=/com.ibm.cluster.gpfs.doc/gpfsbooks.html

best regards,
esv.
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Originally posted by: j.gann

thanks for your pointers, will check them.

s/remote mirroring/concurrent access/ in my original post.

regards
Joachim
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