[CentOS] 4 X 500 gb drives - best software raid config for a backup server?
John R Pierce
pierce at hogranch.com
Sat Feb 21 10:04:42 UTC 2009
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.
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