> From: Polytropon <free...@edvax.de> > Subject: Re: Odd behavior after installing a tape drive > To: "Tim Judd" <taj...@gmail.com> > Cc: mahle...@yahoo.com, freebsd-questions@freebsd.org > Date: Monday, July 20, 2009, 12:22 AM > On Sun, 19 Jul 2009 21:43:29 -0600, > Tim Judd <taj...@gmail.com> > wrote: > > I'm no expert on tape drives either, but I was sure > that "losing a > > SCSI device" is a bad thing for SCSI -- think of it as > an IDE drive. > > you don't just go pulling power or data from a > running, booted > > computer. > > With SCSI, "hot plug" is usually not that problematic as > with > "modern" ATA and SATA on the PC. Anyway, using > > # camcontrol stop <unit> > > before switching off or detaching a SCSI component is often > a > good idea. > > > > > All the devices in a computer are on, stays on, until > the system shuts down. > > SCSI allows you to have "internal devices" outside the > computer, > connected with a cable. In principle, it doesn't even > matter if > a hard disk is inside the computer or outside, same for > optical > disc drives, tape drives, and even scanners. "Hot plug" has > always > been a nice feature of SCSI, even 10 or more years ago, > where > you couldn't imagine something similar in the PC world. > > > > > The PTY/SCSI subject of your email should be > unrelated, but a abruptly > > missing device is never a positive outcome for an > OS. Think about the > > old "removing a mounted USB drive = panic" issue we've > dealt with for > > years. > > Or /dev/mem: device disappeared. :-) > > > > > I am questioning your reasoning behind turning off a > tape drive on a > > live system. I would never recommend that. > > As I said, if you do it "the SCSI way", it's completely > unproblematic. > > > > > -- > Polytropon > From Magdeburg, Germany > Happy FreeBSD user since 4.0 > Andra moi ennepe, Mousa, ... >
Thanks! I'll do that in the future - I was getting the idea that since camcontrol *includes* a "stop" command I should have done that before pulling the power anyway. :) I still don't know if the two items were related in any way, but I'm not really that worried about it unless it happens again - or at least more than once in a blue moon. I'll have a bit of time this week to test taking it down and back up a few times the "correct" way and see if it exhibits any of the same behavior. Thanks again! -Rich _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
