Shawn Heisey [s...@elyograg.org]: > Performance testing would be required in order to make a proper > determination on whether SSD makes financial sense.
I fully agree. [Lack of TRIM with RAID] > then performance eventually suffers, and can become even worse than > a spinning hard disk. Do you have a source for that? > From what people have said here on this list, SSDs can do really really > amazing things for performance ... but IMHO they cannot eliminate the > cache requirement. They may reduce it drastically, of course. It would be exceedingly difficult to set up a machine that had no free memory for cache, so eliminating the need for cache does not really give us anything. What works is when the need for cache is reduced to be non-significant for a machine: When building a search server for a 200GB index, there is quite the difference between needing 200GB free memory for cache and needing 20GB. Even assuming that using a SSD only lowers the cache requirement by 50%, it would still be cheaper to use a 400GB SSD instead of installing the extra 100GB of RAM. (I'm setting the SSD-price to 1/5 of RAM here. YMMW) - Toke Eskildsen
