Any chance to test with more drives (e.g. 40 to match the Sun Thumper
setup) and over all interfaces?
Regards,
Mirko
Jody McIntyre schrieb:
Hi Mirko,
On Tue, Jan 02, 2007 at 08:42:34AM +0100, Mirko Benz wrote:
Please provide more details regarding the HW setup (e.g. disk drive
model and number of drives used, what kind of storage interface was
used, RAID configuration). I could not find it in the file.
The disks are 10x ST350064 in an 8+2 configuration. The storage
interface was 4 Gbit FC. No Special RAID configuration except a block
size of 4096 (which we recommend for all DDN+Lustre installations.)
Cheers,
Jody
Thanks,
Mirko
Jody McIntyre schrieb:
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.
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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