Thank you everybody for the detailed answers, the help is well appreciated.
A couple of follow-up questions: - Is the supercap + flash memory considered superior to the BBU in practice? Is that type of system well tested? - Is the linux support of the LSI and Adaptec cards comparable? -Dan On Wed, Feb 2, 2011 at 10:15 PM, Greg Smith <g...@2ndquadrant.com> wrote: > Scott Marlowe wrote: > > On Wed, Feb 2, 2011 at 10:46 PM, Greg Smith <g...@2ndquadrant.com> > <g...@2ndquadrant.com> wrote: > > > example. Scott Marlowe was griping recently about a similar issue in some > of the LSI models, too. I suspect it's a problem impacting several of the > larger RAID cards that use the big Intel IOP processors for their RAID > computations, given that's the part with the heatsink on it. > > > Specifically the LSI 8888 in a case that gave very low amounts of air > flow over the RAID card. The case right above the card was quite hot, > and the multilane cable was warm enough to almost burn my fingers whe > > > Interesting...that shoots down my theory. Now that I check, the LSI 8888 > uses their SAS1078 controller, which is based on a PowerPC 440 > processor--it's not one of the Intel IOP processors at all. The 8308 Dan > has as an option is using the very popular Intel IOP333 instead, which is > also used in some Areca 1200 series cards (1220/1230/1260). > > The Adaptec 5405 and 5805 cards both use the Intel IOP348, as does the > Areca 1680. Areca puts a fan right on it; Adaptec does not. I suspect > the only reason the 5805 cards have gotten more reports of overheating than > the 5405 ones is just because having more drives typically connected > increases their actual workload. I don't think there's actually any > difference between the cooling situation between the two otherwise. > > > -- > Greg Smith 2ndQuadrant US g...@2ndquadrant.com Baltimore, MD > PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us > "PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books > >
