Date: Mon, 28 Mar 2005 16:38:02 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: ticso@cicely.de Subject: Re: Reattach/redetect allways connected umass device - is it possible ? Message-ID: <20050328143801.GH14532@cicely12.cicely.de> In-Reply-To: <32733.1112019870@critter.freebsd.dk> References: <20050328134856.GF14532@cicely12.cicely.de> <32733.1112019870@critter.freebsd.dk>
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On Mon, Mar 28, 2005 at 04:24:30PM +0200, Poul-Henning Kamp wrote: > In message <20050328134856.GF14532@cicely12.cicely.de>, Bernd Walter writes: > > >> Driver support for this is not really meaterialized and therefore > >> the model now is that when the media is ejected the geom device > >> is removed and a new one created right away, even if a new media > >> is not inserted right away. > > > >Do you get eject notifications from any device type? > > Right now I belive floppy disks DTRT. Interesting. > >One of my problems is that it is possible with SCSI MO drives to > >eject the media, reinsert a new one and errously continue to work > >with the old GEOM layout. > >I already trashed the data on one media by forgetting to trigger > >a reprobe - since then I use a mount script. > > Well, I have no idea how to pull the information out of the CAM/SCSI > code, but I'm sure there is _some_ way it can be done. There is the test unit ready command. Either it returns OK, or you may get usefull sense data. Here is an example: No media in the drive: [60]cicely13# camcontrol tur -n da -u 0 -v Unit is not ready (pass0:ahc0:0:1:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass0:ahc0:0:1:0): CAM Status: SCSI Status Error (pass0:ahc0:0:1:0): SCSI Status: Check Condition (pass0:ahc0:0:1:0): NOT READY asc:3a,0 (pass0:ahc0:0:1:0): Medium not present Exit 1 Media just inserted and give the drive some time to spin up: [61]cicely13# camcontrol tur -n da -u 0 -v Unit is not ready (pass0:ahc0:0:1:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass0:ahc0:0:1:0): CAM Status: SCSI Status Error (pass0:ahc0:0:1:0): SCSI Status: Check Condition (pass0:ahc0:0:1:0): UNIT ATTENTION asc:28,0 (pass0:ahc0:0:1:0): Not ready to ready change, medium may have changed Exit 1 Just retry TUR command: [62]cicely13# camcontrol tur -n da -u 0 -v Unit is ready Media ejected: [63]cicely13# camcontrol tur -n da -u 0 -v Unit is not ready (pass0:ahc0:0:1:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass0:ahc0:0:1:0): CAM Status: SCSI Status Error (pass0:ahc0:0:1:0): SCSI Status: Check Condition (pass0:ahc0:0:1:0): NOT READY asc:3a,0 (pass0:ahc0:0:1:0): Medium not present Exit 1 Media reinserted without waiting the drive to spin up: [64]cicely13# camcontrol tur -n da -u 0 -v Unit is not ready (pass0:ahc0:0:1:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass0:ahc0:0:1:0): CAM Status: SCSI Status Error (pass0:ahc0:0:1:0): SCSI Status: Check Condition (pass0:ahc0:0:1:0): NOT READY asc:98,0 (pass0:ahc0:0:1:0): Vendor Specific ASC Exit 1 After the drive spun up: [65]cicely13# camcontrol tur -n da -u 0 -v Unit is not ready (pass0:ahc0:0:1:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass0:ahc0:0:1:0): CAM Status: SCSI Status Error (pass0:ahc0:0:1:0): SCSI Status: Check Condition (pass0:ahc0:0:1:0): UNIT ATTENTION asc:28,0 (pass0:ahc0:0:1:0): Not ready to ready change, medium may have changed Exit 1 Retry TUR: [66]cicely13# camcontrol tur -n da -u 0 -v Unit is ready -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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