On Fri, 2006-11-17 at 18:22 +0100, Sven Rudolph wrote: > Something I forgot to mention: I became aware of the problem when I > tried to read from (or write to (?)) three disks in parallel and the > sum of the transfer speeds was a bit below 40 MBytes/second when I ran > two disks and it was the nearly the same with three disks. The first > disk was the fastest in the three-disk test run, and the third was the > slowest. I suppose this is due to SCSI priority by SCSI ID. So I'm > quite sure that the bus really only runs in FAST-40 mode. OK ... I think there's something unusual about your actual card. I checked the specs and FAST-40 should be LVD. The DV information indicates that the device is also Narrow not wide, which implies either it refused wide negotiation, or that the card wasn't able to set the correct parameters. You can try to set it manually with echo 1 > /sys/class/spi_transport/target1:0:3/width then you have to do I/O to force the renegotiation (fdisk is good for this) and then try and cat back the parameter. You can also try to force it up to FAST-160 with echo 6.25 > /sys/class/spi_transport/target1:0:3/period and again force I/O with fdisk then cat the parameter back to see if it took. James - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
