On Fri, Jul 30, 1999 at 10:38:07PM -0500, D. Carlos Knowlton wrote:
> Hey guys,
>
> I have been trying for the past several months to get the full throughput
> that I'm supposed to be getting from my UDMA-66 hard drives, but - try as I
> might - I can only get sustained reads of 19MB/s max. I am using a promise
19MB/s is probably all you will get from those disks. What does their specs say ?
What did you expect ? Not 66MB/s hopefully... Because my U2W disks can do
80MB/s burst bus transfers, there's no way in h*ll I'm gonna get that kind
of sustained speed from the platters.
...
>
> /dev/hda
> setting xfermode to 20 (singleword DMA mode4)
> hda: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
> hda: drive_cmd: error=0x04 { DriveStatusError }
> HDIO_DRIVE_CMD failed: I/O error
>
> I get the same message when I try to set any of the DMA modes. What am I
> doing wrong? Does Linux even support UDMA-66 yet?
I don't know (and I don't care :) If you can get almost 20 MB/s from disks today
that's really good. Very few commodity disks will give you more. Be it UDMA
or not.
>
> P.S. For what it's worth, RAID5 came up great! (thanks to all your help! =)
>
Was 19MB/s from a RAID ?
If so, how many disks ? What RAID configuration ? How did you measure it ?
Regards,
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