On 4/6/11 2:11 PM, "Andy" <angelflow@xxxxxxxxx> wrote: > >--- On Wed, 4/6/11, Scott Carey <scott@xxxxxxxxxxxxxxxxx> wrote: > > >> I could care less about the 'fast' sandforce drives. >> They fail at a high >> rate and the performance improvement is BECAUSE they are >> using a large, >> volatile write cache. > >The G1 and G2 Intel MLC also use volatile write cache, just like most >SandForce drives do. 1. People are complaining that the Intel G3's aren't as fast as the SandForce drives (they are faster than the 1st gen SandForce, but not the yet-to-be-released ones like Vertex 3). From a database perspective, this is complete BS. 2. 256K versus 64MB write cache. Power + time to flush a cache matters. 3. None of the performance benchmarks of drives are comparing the performance with the cache _disabled_ which is required when not power safe. If the SandForce drives are still that much faster with it disabled, I'd be shocked. Disabling a 256K write cache will affect performance less than disabling a 64MB one. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
