On Tue, Dec 9, 2008 at 1:11 PM, Joshua D. Drake <jd@xxxxxxxxxxxxxxxxx> wrote: > Hard drives work, their cheap and fast. I can get 25 spindles, 15k in a > 3U with controller and battery backed cache for <$10k. While I agree with your general sentiments about early adoption, etc (the intel ssd products are the first flash drives that appear to have real promise in the enterprise), the numbers tell a different story. A *single* X25-E will give similar sustained write IOPS as your tray for far less price and a much better worst case read latency. All this without the 25 sets of whizzing ball bearings, painful spin-up times, fanning, RAID controller firmware, and various other sundry technologies to make the whole thing work. The main issue that I see with flash SSD is if the promised wear lifetimes are believable in high load environments and the mechanism of failure (slowly degrade into read only) is accurate. So, at least in relative terms, 15k sas drives are not 'fast'. They are terribly, awfully, painfully slow. They are also not cheap in terms of $/IOPS. The end is near. merlin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
