[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.