bug1 wrote:
>
> 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 ?
gonna jump on the bandwagon here...:-)
How often do you get them?? On all the disks, or just
some of them. In all the modes or just with ultra66???
i get some every couple of days, normally resulting in
the dma getting disabled for the specific drive...:-(
but the filesystems seem to be ok...
remo
