Re: 1x 3ware controllers vs. 2x 3ware controllers
From: Jon Lewis <hidden>
Date: 2004-07-31 14:24:13
On Sat, 31 Jul 2004, Mikael Abrahamsson wrote:
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).
Hardware RAID5 or software RAID5? My experience has been that even the higher end hardware RAID5 cards I've dealt with give nowhere near the performace you get with software RAID5. HW RAID5 is a good way to make an IO intensive system turn into a slug.
I learnt this the hard way running a nntp (news) server.
The only RAID I'd do / have done with nntp servers is RAID1 for the system and RAID0 for the spool...but with modern software you don't even need RAID0 for the spool...you just keep telling it to use more drives for spools. ---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________