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- Newsgroups: comp.os.linux
- Path: sparky!uunet!stanford.edu!snorkelwacker.mit.edu!bloom-picayune.mit.edu!daemon
- From: tytso@ATHENA.MIT.EDU (Theodore Ts'o)
- Subject: Re: QIC 40 / QIC 80 ?
- Message-ID: <1992Sep4.035614.4455@athena.mit.edu>
- Sender: daemon@athena.mit.edu (Mr Background)
- Reply-To: tytso@ATHENA.MIT.EDU (Theodore Ts'o)
- Organization: The Internet
- Date: Fri, 4 Sep 1992 03:56:14 GMT
- Lines: 21
-
- From: billp@jupiter.cse.utoledo.edu (Bill Parquet)
- Date: 3 Sep 92 17:49:18 EST
-
- I've seen a lot of discussion about this. The people who were working on
- that for 386bsd complained that the timing requirements were extremely tight
- for running qic 40/80... At least too tight for a multitasking environment.
-
- If it were really necessary, I'd much rather have a tape backup program that
- ran in some sort of exclusive mode than nothing at all.
-
- This reminds me of the mini-cassette tape on VAX 750's that were
- typically used to bootstrap a 750 before an OS had been loaded on its
- hard disks. That tape drive didn't have DMA, nor any buffering, so you
- got an interrupt for each byte that you wanted to write to the tape. If
- you wanted to write a new bootstrap tape, the only way it would work is
- if you did it in single user mode, with no other processes running.
- Even running the /etc/update daemon would cause the write to fail.
- Fortunately, you very rarely (if ever) needed to write a new bootstrap
- tape; but when you did, it was a very painful process. :-)
-
- - Ted
-