Re: [CentOS] 4 X 500 gb drives - best software raid config for a backup server?

Kay Diederichs wrote:

hdparm -tT tests one type of disk access, other tools test other aspects. I gave the hdparm numbers because everyone can reproduce them. For RAID0 with two disks you do see - using e.g. hdparm - the doubling of performance from two disks. If you take the time to read (or do) RAID benchmarks you'll discover that Linux software RAID1 is about as fast as a single disk (and RAID0 with two disks is about twice the speed). It's as simple as that.

maybe with a simple single threaded application. if there are concurrent read requests pending it will dispatch them to both drives.