On 01/28/2005-05:57PM, Alex Turner wrote: > > > > Your system A has the absolute worst case Raid 5, 3 drives. The more > > drives you add to Raid 5 the better it gets but it will never beat Raid > > 10. On top of it being the worst case, pg_xlog is not on a separate > > spindle. > > > > True for writes, but not for reads. >
Good point. > > My main point is that you can spend $7k on a server and believe you > have a fast system. The person who bought the original system was > under the delusion that it would make a good DB server. For the same > $7k a different configuration can yield a vastly different performance > output. This means that it's not quite apples to snow shovels. That point is definatly made. I primarily wanted to point out that the controlers involved were not the only difference. In my experience with SQL servers of various flavors fast disks and getting things onto a separate spindles is more important than just about anything else. Depending on the size of your 'hot' dataset RAM could be more important and CPU never is. ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
