On Fri, 13 Feb 2004 [EMAIL PROTECTED] wrote: > > Josh, the disks in the new system should be substantially faster than > > the old. Both are Ultra160 SCSI RAID 5 arrays, but the new system has > > 15k RPM disks, as opposed to the 10k RPM disks in the old system. > > Spindle speed does not correlate with 'throughput' in any easy way. What > controllers are you using for these disks?
This is doubly so with a good RAID card with battery backed cache. I'd bet that 10k rpm drives on a cached array card will beat an otherwise equal setup with 15k rpm disks and no cache. I know that losing the cache slows my system down to a crawl (i.e. set it to write thru instead of write back.) comparitively speaking. ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html