SRFERGU%ERENJ@PUCC.PRINCETON.EDU (Scott Ferguson) (08/17/90)
Sorry to be such a bonehead, but I didn't pay much attention to people when they talked about working an Exabyte drive off an SR10.2 DN4500 Has anyone gotten one to work without picking up proprietary garbage? I'd like to be able to just do cpio/tar functions and direct output to a raw SCSI tape device file, the way most systems handle it. I know, it's very different on Apollos, but this type of raw device support really works on other systems, I'd make it a priority if I were directing things... Thanks. Scott
krowitz@RICHTER.MIT.EDU (David Krowitz) (08/17/90)
At SR10.2, there are some SCSI tape device files included in /dev as part of the standard release. These do work with an Exabyte, although you may have toset your SCSI unit ID on your tape drive to match those used by Apollo ... I don't how their device driver deals with multiple tape drives (say a SCSI internal cartridge and an external Exabyte). The SR10.2 release has a /dev/rmts9 and /dev/rmts13 set of device files in addition to the /dev/rmts8 and /dev/rmts12 files. Maybe the first set are for SCSI unit 1, and the others are for unit 0? -- David Krowitz krowitz@richter.mit.edu (18.83.0.109) krowitz%richter.mit.edu@eddie.mit.edu krowitz%richter.mit.edu@mitvma.bitnet (in order of decreasing preference)
thompson@PAN.SSEC.HONEYWELL.COM (John Thompson) (08/18/90)
> At SR10.2, there are some SCSI tape device files included in > /dev as part of the standard release. These do work with an > Exabyte, although you may have toset your SCSI unit ID on > your tape drive to match those used by Apollo ... We had no problems (plug and play). > I don't how their device driver deals with multiple tape drives > (say a SCSI internal cartridge and an external Exabyte). Seems to handle it ok. Note below for SCSI terminator info. > The SR10.2 release has a /dev/rmts9 and /dev/rmts13 set > of device files in addition to the /dev/rmts8 and /dev/rmts12 > files. Maybe the first set are for SCSI unit 1, and the > others are for unit 0? The SCSI cartridge tape is still /dev/rct8 (12), unless I'm sorely mistaken. The cartridge tape is SCSI device 0. The 8mm tape drives are (should be) devices 1 and 2. The /dev device files for these are /dev/rmts8 unit 1, rewinding /dev/rmts9 unit 2, rewinding /dev/rmts12 unit 1, non-rewind /dev/rmts13 unit 2, non-rewind As I understand it, there are 3 places that terminators can exist from the WDC-7000 controller. They are on the cartridge drive, on the controller next to the cartridge cable, and on the last unit in the external SCSI chain. If memory serves me, you should have exactly 2 terminators in place. In other words, you should take the controller's terminators OFF if you have both a cartridge drive and an external SCSI chain. (This is from the Apollo Technical Bulletin ATB-03-65A, which states that "both (the PAIR on the controller) terminators will always be in unless the system has both an internal SCSI C-tape and an external SCSI device." Incidentally, I read from somebody here (4 months ago?) that you can set up more than 2 SCSI 8mm drives. If you check the Omniback installation, it appears that 'unit X rewind' is minor device number '4X' and 'unit X non-rewind' is minor device number 32+4X. I haven't tried setting up more than 2 8mm drives on a node, and so don't know if this'll work or kill the node or something in-between. John Thompson (jt) Honeywell, SSEC Plymouth, MN 55441 thompson@pan.ssec.honeywell.com As ever, my opinions do not necessarily agree with Honeywell's or reality's. (Honeywell's do not necessarily agree with mine or reality's, either)