MSCP SCSI controller speed

9000 VAX vax9000 at gmail.com
Wed Nov 9 21:06:06 CST 2005


On 11/9/05, 9000 VAX <vax9000 at gmail.com> wrote:
> >
> >         dd if=syssrc.tar of=/dev/null bs=16k count=1000
> 16384000 bytes transferred in 21 secs (780190 bytes/sec)
> >         dd if=/dev/zero of=blah.null bs=16k count=1000
> 16384000 bytes transferred in 35 secs (468114 bytes/sec)
> >
> > I suspect the write will be faster, and reflect the true speed of the i/o.
> It is the opposite. strange.

OK, maybe you are right. The write operation should be faster. The OS
latency there is smaller. It was my controller that slowed down the
write operation. I need to take a look to find out why.

vax, 9000




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