On Fri, 2005-04-08 at 15:41, Vivek Khera wrote: > On Apr 8, 2005, at 4:35 PM, Bob Henkel wrote: > > > desktop SATA drive with no RAID? I'm by any means as knowledgeable > > about I/O > > setup as many of you are but my 2 cents wonders if the Dell RAID is > > really > > that much slower than a competitively priced/speced alternative? Would > > Joel's problems just fade away if he wasn't using a Dell RAID? > > > > "Dell RAID" is not one thing. They sell "altered" RAID cards from > Adaptec and LSI. Whatever alteration they do to them tends to make > them run not so fast. > > I have a Dell SATA RAID (adaptec based) on the office server and it is > OK, though not something I'd buy again. > > I have various PERC 3 and PERC 4 RAID controllers on my servers (SCSI > based) and they suck under heavy I/O load. > > I wonder why the name-brand LSI cards work so much faster... perhaps it > is the motherboard? I don't know, and I don't care... :-) For me, > high performance DB and Dell servers are mutually exclusive.
It would be nice to be able to put a stock ami megaraid in one and see. Do you run your 2650s with hyperthreading on? I found that slowed mine down under load, but we never had more than a couple dozen users hitting the db at once, so we may well have had a different load profile than what you're seeing. ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
