[5285] in linux-scsi channel archive
Re: DAT trouble
daemon@ATHENA.MIT.EDU (Richard Fish)
Fri Dec 4 15:25:47 1998
Date: Fri, 04 Dec 1998 08:32:00 -0700
From: Richard Fish <rjf@estinc.com>
To: Jon Lewis <jlewis@inorganic5.fdt.net>, linux-scsi@vger.rutgers.edu
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.
DOH!
My apologies -- there doesn't appear to be a standard for DDS2
performance. :<
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...
But what I said about 120m==DDS2 is still valid...
--
Richard Fish Enhanced Software Technologies, Inc.
Software Developer 4014 E Broadway Rd Suite 405
rjf@estinc.com Phoenix, AZ 85040
(602) 470-1115 http://www.estinc.com
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