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- Newsgroups: comp.sys.next.sysadmin
- Path: sparky!uunet!decwrl!access.usask.ca!kakwa.ucs.ualberta.ca!news
- From: sherwood@fenris.space.ualberta.ca (Sherwood Botsford)
- Subject: Re: ioctl for DAT compression
- Message-ID: <1992Aug21.183100.16649@kakwa.ucs.ualberta.ca>
- Sender: news@kakwa.ucs.ualberta.ca
- Nntp-Posting-Host: fenris.space.ualberta.ca
- Organization: University Of Alberta, Edmonton Canada
- References: <15080@umd5.umd.edu>
- Date: Fri, 21 Aug 1992 18:31:00 GMT
- Lines: 38
-
- Mike Matthews writes
- >
- > Also, is there a way to determine if a tape is in the
- drive and ready to go?
- > I tried mt -f /dev/nrst0 status but it never gave
- consistent errors (returned
- > 06, then 02, then 00 without me doing anything -- and
- this was after the
- > ready light came back on too).
-
- 6 means that the device has been reset or there has been a
- change of cartridge.
-
- 2 means that the device is not ready.
-
- 0 means everything is ok.
-
- 80 means that there is a tape loaded, and its at a
- filemark.
-
- 40 means that there is a tape loaded and its at Logical
- Beginning of tape.
-
- Status remains set until the drive receives a command.
- Thus you could have changed the tape 10 minutes ago, and mt
- status will return 6.
-
- Get TarChive.tar.Z if you want to see some samples of how
- to check status and decide what to do from there. (On
- sonata.)
-
- I think you could modify the mtsense command in that same
- file to set compression on.
-
- CAVEAT: Using compression on a Tape drive is not a good
- plan. If you have a glitch, the remainder of the
- compressed archive is usually undecipherable. Don't do
- this unless you can't fit what you want on a single tape.
-