Date: Sat, 3 Jan 2004 11:04:28 +0000 From: Scott Mitchell <scott+freebsd@tuatara.fishballoon.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: questions@freebsd.org Subject: Re: swapping external hard drives Message-ID: <20040103110428.GB14806@tuatara.fishballoon.org> In-Reply-To: <20040102205547.GC88798@dan.emsphone.com> References: <200401022045.i02KjnrM023470@lv.raad.tartu.ee> <20040102205547.GC88798@dan.emsphone.com>
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On Fri, Jan 02, 2004 at 02:55:47PM -0600, Dan Nelson wrote: > In the last episode (Jan 02), Toomas Aas said: > > However, when I umount /backup and remove the drive, the da0 device > > somehow remains active (can be seen with 'camcontrol devlist'). When > > I then plug in the second drive, it becomes da1, which spoils all my > > beautiful backup plans. I would prefer that when I remove one drive > > and plug in the other, it becomes da0 again. So I need to get the > > 'old' da0 entry to go away when unplugging the drive. How can I do > > that? > > > > I tried 'camcontrol rescan 0:0:0' after disconnecting the drive, but > > it just hangs until I plug the drive back in. I tried 'camcontrol > > reset 0', but this returned error 0x6 (IIRC). > > Try just "camcontrol rescan 0" to rescan the entire FW bus. I don't > know if scanning just a single LUN will allow the whole device to > disappear. I think it was more intended for SCSI/FC RAIDs, so you > could add/remove/resize volumes. Just guessing here, though. You probably also want to do 'fwcontrol -r' a few times after unplugging the drive (three seems to work for me...) See sbp(4) for reasons why this is necessary. Also note the warning about tagged queueing on that page - hopefully you lucked out and your drives are OK with this; I had serious file corruption issues until I turned off tagged queueing. You might want to verify that the data on the backup is really what it should be :-( Scott -- =========================================================================== Scott Mitchell | PGP Key ID | "Eagles may soar, but weasels Cambridge, England | 0x54B171B9 | don't get sucked into jet engines" scott at fishballoon.org | 0xAA775B8B | -- Anon
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