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- From: lwatkins@jhunix.hcf.jhu.edu (Lee Watkins)
- Newsgroups: comp.sys.next.misc,comp.sys.next.sysadmin,comp.unix.questions
- Subject: HELP (please)! Errors trying to backup with dump to SCSI tape
- Summary: this should be pertinent to LOTS of NeXT users...
- Keywords: HELP dump backup tape SCSI
- Message-ID: <1992Jul31.160714.18334@jhunix.hcf.jhu.edu>
- Date: 31 Jul 92 16:07:14 GMT
- Followup-To: poster
- Distribution: na
- Organization: HAC - Johns Hopkins University, Baltimore
- Lines: 65
-
-
- I looked in NeXTanswers and FAQs and the Net & Sys Admin manual and NeXT man
- pages for st, mt, etc. and found little of real help when trying to do a
- backup to a SCSI tape device. This seems like a subject that would be of
- interest to almost every NeXT owner/user.
-
- Well, I thought I had it figured out. I borrowed a 1/4" SCSI tape drive from
- a SPARCstation IPC, a 150Mb drive (it's stamped inside the tape bay).
- Plugged it into my NeXTstation (OS 2.1) and rebooted and it came up as a
- ARCHIVE VIPER 150 21531 whatever that means. I can tar tapes to it just fine
- as /dev/rst0, even used the demo of enTar sucessfully.
-
- When I go to do a level 0 dump (which I've never done, so I need to...) I
- found that it estimated over 7 tapes, when I only have a little over 350Mb
- of files to backup. This does not make sense if the drive and the tapes
- are 150Mb (I am using Maxell MC-6150 cartridge tape).
-
- So I read the dump man page, and it explains how with various tape drives you
- have to tell dump to use the equivalent number of feet of tape that would be
- required if you were actually using the default 1600bpi 9-track tape. 1600bpi
- amounts to 19,200 bytes per foot, so to get 150Mb on a tape I should specify
- to dump that the tape is 8214 feet in length. So I tell it to use "almost" the
- whole tape, as shown in the man page for dump example for the Exabyte tape
- drive. Am I making sense?
-
- Anyway, it does not work, I get the following error:
- ----
- nextlee# mt -f /dev/rst0 status
- Generic SCSI tape drive, residual=0
- Sense Key = 0x05
- Sense Code = 0x00
- Sense Byte 0x13 = 0x00
- Sense Byte 0x14 = 0x00
- Sense Byte 0x15 = 0x00
- Sense Byte 0x16 = 0x00
-
- nextlee# dump 0usf 8000 /dev/rst0 /
- DUMP: Date of this level 0 dump: Fri Jul 31 11:17:47 1992
- DUMP: Date of last level 0 dump: the epoch
- DUMP: Dumping /dev/rsd0a (/) to /dev/rst0
- DUMP: mapping (Pass I) [regular files]
- DUMP: mapping (Pass II) [directories]
- DUMP: estimated 299194 tape blocks on 2.21 tape(s).
- DUMP: dumping (Pass III) [directories]
- DUMP: Tape write error 0 feet into tape 1
- DUMP: NEEDS ATTENTION: Do you want to restart?: ("yes" or "no")
- ----
- Notice that it now seems to want about the right number of tapes (I have
- three tapes sitting here ready to go). I try to restart, put in a different
- tape, I tried powering off/on the tape drive, rebooting my whole system,
- etc. I am now at an impasse. WHY DOES THIS HAVE TO BE SO OBSCURE?
-
- Other info: I did a fsck before doing dump, as it suggested in the Admin
- manual--no problems there. I booted in single user mode to do the the dump
- (although the above error was done in a shell window on root).
-
- Any help would be greatly appreciated. In fact, once I get this figured out
- I would be perfectly glad to write it up in excruciating detail for NeXT-
- Answers.
-
- Lee Watkins, Jr.
- JHU Homewood Academic Computing
-
- P.S.-I am not a UNIX guru, or a sysadmin, just a mid-level manager in a
- computing organization with a NeXT on my desk.
-