Date: Thu, 8 Aug 2013 05:56:21 +0200 From: Michael Schuh <michael.schuh@gmail.com> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: how to remove usb-storage devices without CAM errors Message-ID: <CADwRVEbVYEXm_FsBxwZvb7DSr=SevCRGpsJE=UsO3bRxZtw9Ew@mail.gmail.com>
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H i@list, i have a simple wuestion caused by a "device loss". is there a special routine for unplugging usb-storage devices? in the meaning: may be settle some commends before unplugging the device other than umount. according to the handbook there ist no special routine. unmounting should be enough and pull the USB-Devie out of the bus. i could not find anything related by the help of the big oracle. i have some usb-sticks that i need to write with prepared disk-images by using dd. two or more drives are already plugged in and da0 is already finished, da1 or da2 still at writing. unplugging da0 causes a CAM error and interrupts the ongoing write. i am not sure if all writes to each different device gets stopped. this is a reproduceable behaviour thats new to me. see the listing below. let me know if i can and what to do to help to further identify and investigate this error. iirc this happens for the first time this way. my last upgrade before this was feb./march. time of svn checkout was 2013-07-22 so its may be already fixed? many thanks in advance regards michael =============== ugen3.2: <Verbatim> at usbus3 umass0: <Verbatim STORE N GO, class 0/0, rev 2.10/1.10, addr 2> on usbus3 umass0: SCSI over Bulk-Only; quirks = 0x0100 umass0:8:0:-1: Attached to scbus8 da0 at umass-sim0 bus 0 scbus8 target 0 lun 0 da0: <Verbatim STORE N GO PMAP> Removable Direct Access SCSI-6 device da0: 40.000MB/s transfers da0: 7385MB (15124992 512 byte sectors: 255H 63S/T 941C) da0: quirks=0x2<NO_6_BYTE> ugen7.2: <Verbatim> at usbus7 umass1: <Verbatim STORE N GO, class 0/0, rev 2.10/1.10, addr 2> on usbus7 umass1: SCSI over Bulk-Only; quirks = 0x0100 umass1:9:1:-1: Attached to scbus9 da1 at umass-sim1 bus 1 scbus9 target 0 lun 0 da1: <Verbatim STORE N GO PMAP> Removable Direct Access SCSI-6 device da1: 40.000MB/s transfers da1: 7385MB (15124992 512 byte sectors: 255H 63S/T 941C) da1: quirks=0x2<NO_6_BYTE> (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 00 02 44 80 00 00 80 00 ugen3.2: <Verbatim> at usbus3 (disconnected) (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error umass0: (da0:at uhub3, port 3, addr 2 (disconnected) umass-sim0:0:0:0): Retrying command (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 00 02 44 80 00 00 80 00 (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error (da0:umass-sim0:0:0:0): Retrying command (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 00 02 44 80 00 00 80 00 (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error (da0:umass-sim0:0:0:0): Error 5, Retries exhausted (da0:umass-sim0:0:0:0): SYNCHRONIZE CACHE(10). CDB: 35 00 00 00 00 00 00 00 00 00 (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error (da0:umass-sim0:0:0:0): Retrying command (da0:umass-sim0:0:0:0): SYNCHRONIZE CACHE(10). CDB: 35 00 00 00 00 00 00 00 00 00 (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error (da0:umass-sim0:0:0:0): Error 5, Retries exhausted (da0:umass-sim0:0:0:0): got CAM status 0x44 (da0:umass-sim0:0:0:0): fatal error, failed to attach to device (da0:umass-sim0:0:0:0): lost device - 0 outstanding, 5 refs (da0:umass-sim0:0:0:0): removing device entry
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