Re: Current 7 U320 transfer rate only 3.300 MB/s

Dan Nelson wrote:
In the last episode (May 30), Rod Person said:

I have and LSI u320 SCSI controller on a TYAN Thunder K8WE board with
and nvidia4 chipset. My boot message displays the following

da0 at mpt0 bus 0 target 0 lun 0
da0 <FUJITSU MAP3735NP 5605> FIXED Direct Access SCSI-3 device
da0 3.300MB/s tranfers, Tagged Queueing Enabled

Why is my transfer rate so low? Anyone have an idea how I can correct
this?


That may just be a display bug. Does "diskinfo -t da0" report
reasonable speeds? If not, check your bios to see if you are forcing a
slow speed, or try running "camcontrol negotiate da0 -R 160" to force
320MB speeds (160 Mhz * 16 bit bus = 320MB).


It's a bug in the MPT driver, though it usually only manifests itself
with 4 or more drives.

Scott

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