Re: Perfomance Tuning

On Wed, 2003-08-13 at 09:37, Tom Lane wrote:
> Jeff <threshar(at)torgo(dot)978(dot)org> writes:
> > On Tue, 12 Aug 2003, Christopher Browne wrote:
> >> Are you _certain_ that's still true? Have you a metric that shows
> >> Informix being 10x faster on a modern system? That would be quite
> >> surprising...
>
> > We were forced (for budget reason) to switch from raw disk to cooked files
> > on our informix db. We took a huge hit - about 5-6x slower.
> > [snip]
> > The raw disks were on a hitachi fibre array and the cooked files
> > were on a raid5 (scsi). Forget how many spindles in the raid.
> > There were 20 raw disks)
>
> Seems like you can't know how much of the performance hit was due to the
> filesystem change and how much to the hardware change. But I'd bet 20
> disks on fibre array have way more net throughput than a single RAID
> array on scsi.

I wouldn't be surprised either if the fiber array had more cache
than the SCSI controller.

Was/is the Hitachi device a SAN?

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