> Jon Lewis wrote:
> >
> > On Thu, 3 Dec 1998, Richard Fish wrote:
> >
> > > Another test is to run a backup, turning off software and hardware
> > > compression with "mt -f /dev/st0 datcompression off". Your throughput
> > > to the drive should be ~366K/sec with DDS-II. With DDS1 you will get
> > > ~175K/sec.
> >
> > It doesn't seem to be that simple. Sony claims the 7000 can do 1.5MB/s.
> > In real life, I got 40MB/min, which is about twice the speed I used to get
> > from older Archive based DATs.
>
[...]
>
> A quick survey of DDS2 drive manufactures web sites indicates a wide
> range of claimed transfer rates -- from 366K/s native for a WangDAT up
> to the 788K/s for the Sony...
For what it is worth, I get transfer rates in excess of 1.3 MB/s to tape
with the unmodified st driver on a P2 with AH2940UW. That is data after
compression: measured by tape blocks/time on a tar transfer. This is an
NS20 drive rather than DAT, but shows that the scsi st thoughput is unlikely
to be the bottleneck? 2.0.36
ael
--
Adrian Lawrence.
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