Re: Mirroring on 10.10

Steve Holdoway wrote:
>
> We have just taken delivery of a 5 processor T520, running HP-UX
> 10.10. The system is set up such that we have a 4 gig system disc on
> its own F/W controller, and 14 x 2 gig discs mirrored over 4 extra F/W
> controllers. This is being used mainly to access an Oracle 7.2.3
> database.
>
> Initial results indicate much less of a performance increase from the
> single processor D350 that is used for development. This machine is
> set up to use asynchronous IO and the kernel is configured as
> recommended by HP and Oracle.
>
> Using glance, the machine seems to have no bottlenecks anywhere, is
> just doesn't seem to be running at its full potential. I suspect that
> it is the disc mirroring that is the problem. Do I need to rejig the
> kernel for that as well?
>
> Any suggestions will be extremely gratefully received... explaining to
> out customer just why they need this machine when it doesn't work to
> its full potential could be very embarassing!
>
> TIA
>
> Steve.

I look after a four processor K410 supporting a *datawarehouse* of some 380 gig using 10 disk arrays.

I had the chance to compare the performance of a k210 with two processors configured much the same as yours. I got somewhat the same *surprise* until I kranked up the number of jobs so that the k210 was *overloaded* that is with both processors with no idle time. Then the difference began to show. There were other differences which were to do with the way the disk arrays were configured which showed a marked improvement over the k210 which had not been optimized in the same way. That is IO throughput was better on the k410. You probably got the T520 because the load was greater than could be managed by something less.

Good luck Received on Thu Jul 25 1996 - 00:00:00 CEST