Re: Reattach/redetect allways connected umass device - is it possible ?

From: Bernd Walter (ticso_at_cicely12.cicely.de)
Date: 03/28/05

  • Next message: Bernd Walter: "Re: Reattach/redetect allways connected umass device - is it possible ?" 
    Date: Mon, 28 Mar 2005 16:38:02 +0200
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    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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