Path: utzoo!attcan!uunet!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!ncar!ico!dougp
From: dougp@ico.isc.com (Doug Pintar)
Newsgroups: comp.unix.i386
Subject: Re: Using DC6250's in an archive 2150S/E
Keywords: archive tape backup scsi qic02
Message-ID: <1990Aug2.191123.2555@ico.isc.com>
Date: 2 Aug 90 19:11:23 GMT
References: <3689@wb3ffv.ampr.org> <1990Jul31.013053.14163@nstar.uucp> <1700@mic.UUCP>
Reply-To: dougp@ico.ISC.COM (Doug Pintar)
Organization: Interactive Systems Corp., Boulder CO
Lines: 18


OK, I was stunned by all the speculation and no hard answers to the original
question, so I went out and bought a 6250 yesterday (~$31 US).  Tried it on my
Gateway 2000 25MHz (Micronics) box with Adaptec 1542A and Archive 2150S.  (Oh
yeah, running ISC Unix 2.2 with Adaptec set for 5.7 MB/sec [speed 4], bus-on 9
microsec, bus-off 6 microsec).  I wrote a little test program that just wrote
320KB buffers to the tape (/dev/ct c 41 8), checked return codes and added up
total transfer length.  The tape streamed continuously, and the numbers came
out as follows:  Total tape capacity 269138944 bytes (256.67 MB)

	Real time:  42:47.3  (~104800 Bytes/sec)
	User time:      0.2
	Sys time:       6.0

All in all, I'm pretty impressed!  150 MB was cutting what I needed to keep
track of daily pretty fine, but 250 should give me plenty of growth room.
Looks like a wiener, folx!
DLP