--- On Sat, 22/11/08, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > You really have two choices. First is to try and use it as > a plain > SCSI card, maybe with caching turned on, and do the raid in > software. > Second is to cut it into pieces and make jewelry out of it. Haha, I'm not really into jewelry, although I had thought of smacking it into a pile of dust with a lump hammer, that's much more my thing. > Anything > before the Perc 6 series is seriously brain damaged, and > the Perc6 > brings the dell raid array line squarly in line with a 5 > year old LSI > megaraid, give or take. And that's being generous. > Well this card thinks it's a 5 year old lsi megaraid. I've got a pile of perc5i megaraid paperweights on my desk at work, so this was kinda expected really. > > I've tried writeback and write through modes, > tried changing cache flush times, disabled and enabled > multiple PCI delayed transactions, all seem to have little > effect. > > Yeah, it's like trying to performance tune a yugo. > Did I mention I drive a yugo? > > Finally I decided to wave goodbye to Dell's > firmware. LSI has it down as a MegaRAID 493 elite 1600, so I > flashed it with their latest firmware. Doesn't seem to > have helped either though. > > Does it have a battery backup module? Often you can't > really turn on > write-back without one. That would certainly slow things > down. But > you should certainly expect > 20 M/s on a modern RAID > controller > writing out to a 4 disk RAID10 > Yeah the battery's on it, that and the 128Mb is really the only reason I thought I'd give it a whirl. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
