Date: Tue, 20 Dec 2005 12:49:29 -0800 From: Matthew Jacob <lydianconcepts@gmail.com> To: Kern Sibbald <kern@sibbald.com> Cc: freebsd-scsi@freebsd.org Subject: Re: Tape drive handling on FreeBSD Message-ID: <7579f7fb0512201249k595e2eai62467a0c0e670451@mail.gmail.com> In-Reply-To: <200512201018.07905.kern@sibbald.com> References: <200512151122.34949.kern@sibbald.com> <200512192306.31821.kern@sibbald.com> <7579f7fb0512191520t484add63p40d81e2754897028@mail.gmail.com> <200512201018.07905.kern@sibbald.com>
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> The only problem I can imagine is if someone already uses O_NONBLOCK on an > open() call and expects it to fail if there is no tape in the drive. This > seems a bit unlikely, but a bit of documentation can avoid most problems. *cough* Documentation didn't help you :-). I'll try and do a bit of work on it over the next week or so but I can't test until I get home and hook up a tape drive (and find a frickin' piece of DTL media for it). Poke me periodically at my private address. > Is the problem here that you *don't* want to do 'space to EOD' when EOM is > > issued? That is, you don't want to lose your actual relative tape > position > > information when seeking to append? > > Yes, exactly. Since Bacula maintains the file/block positions of > jobs/data in > a catalog, it will refuse to append to a tape if the actual EOM of the > tape > does not agree with the catalog. A discrepency can easily occur if, while > writing a tape, the OS crashes (a power loss of course) ... Can't use use block location stuff? Again- let's move this discussion to my private mail address unless anyone else on freebsd-scsi wants to join in.home | help
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