sg04@gte.com (Steven Gutfreund) (03/21/90)
Can anyone out there explain how SUN OS 4.0.3 handles scsi tapes? I have a WANGTEK 5500 (150 Meg) tape drive on by SS1. 1. MT says my tape is a QIC-150 : What do the QIC numbers REALLY mean. 2. Sun admin guide says if I call it /dev/rst0 I write in QIC-11 format and /dev/rst8 in QIC-24 format. Really? what do the device numbers mean and why does scsi-probe say there are 8 units there? 3. What bpi should I use in dump? 4. I have a DAT at scsi address 5, what /rst? should it have, and what should I tell dump. Basically, I'm asking some generous person to put a short tutorial on scsi tapes out on the net. Yechezkal Shimon Gutfreund sgutfreund@gte.com GTE Laboratories, Waltham MA harvard!bunny!sgutfreund
adam@uunet.uu.net (At these prices, I can't NAME names) (03/22/90)
In article <5942@brazos.Rice.edu> sg04@gte.com (Steven Gutfreund) writes: >X-Sun-Spots-Digest: Volume 9, Issue 90, message 7 >I have a WANGTEK 5500 (150 Meg) tape drive on by SS1. > >1. MT says my tape is a QIC-150 : What do the QIC numbers REALLY mean. QIC stands for Quarter Inch Committee. This was a committee formed to establish, I believe, an ANSI standard on tape formats. The number after the QIC is the standard number. Generally, the higher the number the higher the density. QIC-11 is a 45 MB format. QIC-24 is a 60 MB format. QIC-150 is a 150 MB format. >2. Sun admin guide says if I call it /dev/rst0 I write in QIC-11 format > and /dev/rst8 in QIC-24 format. Really? yes, by adding 8 to the "base" device number you can alternately access the QIC-11 or the QIC-24 tape drivers. /dev/rst0 drives tape 0 (usually scsi id 4, but see below) with QIC-11 format whereas, /dev/rst8 drives tape 0 with QIC-24 format I don't think this applies for your 5500, I believe you are limited to QIC-150, but I could be wrong. > what do the device numbers mean and why does scsi-probe say > there are 8 units there? I am not familiar with scsi-probe. I would guess that you have created /dev/st[0-7] and "scsi-probe" is finding those nodes out in /dev >4. I have a DAT at scsi address 5, what /rst? should it have, and what > should I tell dump. This is completely user configurable. Look in the kernel config file for your system. SCSI ID 4 is usually assigned to /dev/{rst,st}0 while SCSI ID 5 is usually assigned to /dev/{rst,st}1 hope this helps, adam margulies metaware incorporated INTERNET: adam@metaware.com UUCP: uunet!metaware!adam ATT: (408)429-META x3016