On Fri, 30 Jul 2004, Jim Buttafuoco wrote: > I have a dual XEON 3.2 Ghz system 12 G of ram with a 3ware 8506-8 in it > (8 250 G drives). The hard raid performance was very bad. with the > load avg going over 40. I then switched over to JBOD and software raid. > The IO wait times are really high and the performance sucks. Very hard > to explain to my boss where the $20k went. The system is a database > server (postgres). I tried both kernel 2.4 and 2.6 with the same > problem. I am now in the process of testing the adaptec raid > controller. You should never ever ever use raid5 with something that is write intensive, such as a database server. Raid5 is a cost compromise that is a little of everything, if you want protection and speed at the same time, you should use raid1 (and possible raid0 the raid1:s). I learnt this the hard way running a nntp (news) server. -- Mikael Abrahamsson email: swmike@xxxxxxxxx - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
