On Thu, Dec 9, 2010 at 04:28, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > On Wed, Dec 8, 2010 at 5:03 PM, Benjamin Krajmalnik <kraj@xxxxxxxxxxxxx> wrote: >> My biggest concern with SSD drives is their life expectancy, > > Generally that's not a big issue, especially as the SSDs get larger. > Being able to survive a power loss without corruption is more of an > issue, so if you go SSD get ones with a supercapacitor that can write > out the data before power down. I agree with Benjamin here. Even if you put multiple SSD drives into a RAID array, all the drives get approximately the same write load and thus will likely wear out and fail at the same time! > As for the Areca controllers, I haven't tested them with the latest > drivers or firmware, but we would routinely get 180 to 460 days of > uptime between lockups That sucks! But does a BBU even help with SSDs? The flash eraseblock is larger than the RAID cache unit size anyway, so as far as I can tell, it might not save you in the case of a power loss. Any thoughts whether software RAID on SSD is a good idea? Regards, Marti -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
