2009/11/13 Laszlo Nagy <gandalf@xxxxxxxxxxxx>: > Hello, > > I'm about to buy SSD drive(s) for a database. For decision making, I used > this tech report: > > http://techreport.com/articles.x/16255/9 > http://techreport.com/articles.x/16255/10 > > Here are my concerns: > > * I need at least 32GB disk space. So DRAM based SSD is not a real > option. I would have to buy 8x4GB memory, costs a fortune. And > then it would still not have redundancy. > * I could buy two X25-E drives and have 32GB disk space, and some > redundancy. This would cost about $1600, not counting the RAID > controller. It is on the edge. I'm not sure a RAID controller brings much of anything to the table with SSDs. > * I could also buy many cheaper MLC SSD drives. They cost about > $140. So even with 10 drives, I'm at $1400. I could put them in > RAID6, have much more disk space (256GB), high redundancy and I think RAID6 is gonna reduce the throughput due to overhead to something far less than what a software RAID-10 would achieve. > POSSIBLY good read/write speed. Of course then I need to buy a > good RAID controller. I'm guessing that if you spent whatever money you were gonna spend on more SSDs you'd come out ahead, assuming you had somewhere to put them. > My question is about the last option. Are there any good RAID cards that are > optimized (or can be optimized) for SSD drives? Do any of you have > experience in using many cheaper SSD drives? Is it a bad idea? This I don't know. Some quick googling shows the Areca 1680ix and Adaptec 5 Series to be able to handle Samsun SSDs. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
