> I would be suspicious of having the db on XIV. Do you have any FC
> or SAS Disk you could try putting the DB on?  I know XIV has lots
> of CPU & cache, but underneath it all is still SATA. I've heard
> Marketing types rave about how fast XIV is, even with SATA,
> because I/O can be spread across many spindles, but I'm not
> entirely convinced it's as good as 15k FC or SAS.

This is _exactly_ what IBM has not, and seems unwilling, to explain.

Soon after IBM finalized the purchase of XIV, they had a series
of seminars around the country (usa) about the box. This wasn't some
little out of the way seminar . . . Moshe (inventor of the box)
was there and gave much of the presentation.   I attended one - Lets
just say it was strange!!!   They hammered on "high performance", over
and over.  They threw up one graph where they claimed 25k iops at
3ms response time for a "cache miss" workload.  Lets see, cache miss
means having to go to the spindle to do the I/O.  SATA drives come
no where close to this response time.  The workload was either
not cache miss, or, they effectively short-stroked the drive such
that the heads never moved.  When I questioned this claim I
got nowhere - just run-around.

Rick



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