Date: Tue, 27 Oct 1998 23:28:07 -0500 (EST) From: Mike Andrews <mandrews@termfrost.org> To: freebsd-hardware@FreeBSD.ORG Subject: Sony SDT-5000 hardware compression? Message-ID: <Pine.BSF.4.05.9810272322520.20447-100000@mindcrime.termfrost.org>
next in thread | raw e-mail | index | archive | help
I'm having problems making hardware compression work on a Sony SDT-5000 tape drive, which is supposed to be a DDS-2 drive. 90 meter tapes are filling up at the 2 gig mark -- I should be able to get at least 3 or so per tape, since the data I'm backing up is pretty compressible. I've tried the obvious: tarkus# uname -a FreeBSD tarkus.dcr.net 2.2.7-STABLE FreeBSD 2.2.7-STABLE #0: Tue Oct 13 07:52:09 EDT 1998 mandrews@dusty.dcr.net:/usr/src/sys/compile/TARKUS i386 tarkus# dmesg | grep ncr0:3:0 (ncr0:3:0): "SONY SDT-5000 3.30" type 1 removable SCSI 2 st0(ncr0:3:0): Sequential-Access st0(ncr0:3:0): 5.0 MB/s (200 ns, offset 8) tarkus# mt status Present Mode: Density = X3B5/88-185A Blocksize variable Comp 0 ---------available modes--------- Mode 0: Density = 0x00 Blocksize variable Mode 1: Density = X3.136-1986 Blocksize = 512 bytes Mode 2: Density = X3.39-1986 Blocksize variable Mode 3: Density = X3.54-1986 Blocksize variable tarkus# mt comp 1 mt: /dev/nrst0: comp: Invalid argument tarkus# mt density 0x8c mt: /dev/nrst0: density: Invalid argument (the latter is the density code on an Exabyte 8500C, supposedly... it was kind a shot in the dark) I'm beginning to wonder if this version of the drive doesn't have compression -- it's labeled SDT-5010 on the case, but comes up as a SDT-5000 when the system boots. There is a jumper on the back that is labeled "DC Disable" on Sony's spec sheet, and I've tried it in both the Enable and Disable position. (DC Disable Disable is a confusing double negative, so I'm not 100% sure which way it's supposed to go. :) This has to be something simple; this kind of thing doesn't usually stump me, and I'll probably be embarassed when someone points it out... Thanks! Mike Andrews (MA12) icq 6602506 -------------- mandrews@termfrost.org VP 'n' Systems/Network Administrator --------------- mandrews@dcr.net Digital Crescent, Frankfort, KY ----------- http://www.termfrost.org/ # view;touch;unzip;finger;mount;mv;mv;mv;yes;mv;yes;mv;yes;umount;sleep To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.05.9810272322520.20447-100000>