RAID-1 read speeds...

[Sumanji]

Hey,

I've read in numerous articles that in RAID-1 there is a theoretical 100% speed boost for reads, as the data can be read from both drives simultaneously (as in RAID-0). However I have never seen actual hard benchmarks to prove this, on either onboard software RAID or dedicated hardware controllers. I have have however seen a few benches where there is no read speed increase at all!

Can anyone confirm or deny this popular myth?!

Cheers,

Su

 

[rpstewart]

The only read speed improvement I've heard of with RAID1 is if the controller supports split seeks so individual requests can go to one drive or the other. This speeds up random accesses but sustained transfers are still handled as a single request and hence are limited to the speed of a single drive.

 

[egnshane]

Theoretically yes you could implement RAID 1 and double your read speeds, but not on most of the RAID controllers. I think people using linux can benefit from it though (Not to sure)