On Wed, 2003-08-13 at 09:37, Tom Lane wrote: > Jeff <[EMAIL PROTECTED]> 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.
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I wouldn't be surprised either if the fiber array had more cache than the SCSI controller. Was/is the Hitachi device a SAN? -- +---------------------------------------------------------------+ | Ron Johnson, Jr. Home: [EMAIL PROTECTED] | | Jefferson, LA USA | | | | "Man, I'm pretty. Hoo Hah!" | | Johnny Bravo | +---------------------------------------------------------------+ ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
