Hello!
On Wed, Nov 22, 2006 at 02:33:23PM -0500, pauln wrote:
> >>So for meaningful comparison we should compare 10k clients file per
> >>process
> >>with 5k cleints shared file. This "only" gives us 2x difference which is
> >>still
> >>better than 4x.
> >>Also stipe size is not specified, what was it set to?
> Oleg, I'm not sure I entirely agree here. If every OSS was used in the
> single file test then from the io hardware perspective they are
> functionally equivalent. They run 2 OSTs on each OSS (which is probably
> done for capacity reasons due to the small lun limitation of ext3) so a
> test which only uses half of the OSTs could still use every OSS
> processor, interconnect link, and fiber channel link.
I have no such information. My assumption was every OST had its own disk
backend, but even if not, we have no idea in what order OSTs were created.
If they were created like on oss0 we have ost0 & ost1 and so on, what I describe
is still correct too.
If somehow number of physical disk backends & osses used in both cases are same
other things might have come into play too, like less spindles used by
underlying disk backend due to partitioning?
Bye,
Oleg
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