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.