Clay Claiborne wrote:
>
> For what its worth, we recently built an 8 ide drive 280GB raid5 system.
> Benchmarking with HDBENCH we got 35.7MB/sec read and 29.87MB/sec write. With
> DBENCH and 1 client we got 44.5 MB/sec with 3 clients it dropped down to about
> 43MB/sec.
> The system is a 600Mhz P-3 on a ASUS P3C2000 with 256MB of ram, the raid drives
> are 40GB Maxtor DMA66, 7200 RPM, and each is run as master on its own channel.
>
> Turning on DMA seems to be the key. Benchmarking the individual drives with
> HDBENCH we got numbers like 2.57MB/sec read and 3.27MB/sec write with DMA off
> and it jumped up to 24.7MB/sec read and 24.2MB/sec write with it on.
>
> That, and enough processing power to see that paritity calc is not a
> bottleneck.
>
Can you use your raid system with DMA turned on or do you get irq
timouts like me ?
