On Wed, Feb 4, 2009 at 2:11 PM, Arjen van der Meijden <acmmailing@xxxxxxxxxxxx> wrote: > On 4-2-2009 21:09 Scott Marlowe wrote: >> >> I have little experience with the 6i. I do have experience with all >> the Percs from the 3i/3c series to the 5e series. My experience has >> taught me that a brand new, latest model $700 Dell RAID controller is >> about as good as a $150 LSI, Areca, or Escalade/3Ware controller. >> I.e. a four or five year old design. And that's being generous. > > Afaik the Perc 5/i and /e are more or less rebranded LSI-cards (they're not > identical in layout etc), so it would be a bit weird if they performed much > less than the similar LSI's wouldn't you think? > And as far as I can remember, our Perc 5/e actually performed similar to a > LSI with similar specs (external sas, 256MB ram, etc) we had at the time of > testing. > Areca may be the fastest around right now, but if you'd like to get it all > from one supplier, its not too bad to be stuck with Dell's perc 5 or 6 > series. We purhcased the Perc 5E, which dell wanted $728 for last fall with 8 SATA disks in an MD-1000 and the performance is just terrible. No matter what we do the best throughput on any RAID setup was about 30 megs/second write and 60 Megs/second read. I can get that from a mirror set of the same drives under linux kernel software RAID. This was with battery backed cache enabled. Could be an interaction issue with the MD-1000, or something, but the numbers are just awful. We have a Perc 6(i or e not sure) on a 6 disk SAS array and it's a little better, getting into the hundred meg/second range, but nothing spectacular. They're stable, which is more than I can say for a lot of older PERCs and the servers they came in (x600 series with Perc 3i for instance). -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
