Jody McIntyre wrote:
Hi all,
Here is a completely new set of sgpdd-survey results from a DDN S2A
9550. After much investigation, it seems there were several problems
with the surveys I posted earlier, mainly a minor hardware issue (which
DDN spotted and fixed almost immediately) and a misconfiguration of
sgpdd-survey itself (which we will address in a future release of the
tool.) I also no longer have access to the hardware used for the first
set of surevys, so I discarded all these results and started again.
You can see that with the right settings (4 MB IOs, no prefetch,
maxcmds=16, and sgpdd-survey using the correct block size of 4096), read
performance now "plateaus" nicely as with an S2A 8500. However, it does
so at a relatively low number for region counts above 16. I expect we
can improve these numbers even furthur and will work with DDN on this,
so don't take these graphs as "final" in any way.
Jody,
Is it expected that the prime settings for a single port will be
relevant when all ports are in use? Is there any way to run this suite
across all the 9500 interfaces simultaneously?
paul
Thanks to Oak Ridge National Laboratory for access to the system used to
perform the first set of surveys, to Indiana University for access to
the system used for this set of surveys, and to DDN for their help so
far in tuning the systems.
Cheers,
Jody
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