On Wed, 16 Jun 2004, Jack Howarth wrote:
If it is true that the Promise RAID 1 does in fact
read partially from each drive to increase the throughput,
does software RAID-1 do the same?
Jack
Raid 1 is mirroring only. For data integrity reasons I can't see how they could read from any but the master mirror.
I suspect your friend is confusing with 1+0, which as you say would require four drives to implement.
I doubr software raid would act any differently (but I'm willing to be corrected here :)
I can say that the promise read performance with a two disk stripe was substanstially better than a single disk.
I suspsct that some of this is due to the onboard cache on the card, but I couldn't be too sure.
I'm not a huge fan of the promise cards, 3Ware seemto be more reliable from what I've found.
Cheers,
Al
