Date: Thu, 8 Aug 2013 17:46:56 +0200 From: Michael Schuh <michael.schuh@gmail.com> To: Alban Hertroys <haramrae@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: how to remove usb-storage devices without CAM errors Message-ID: <CADwRVEa75x0Rs%2BwPqoVy41viWHNSuisjjiORfxy6tUPJwZCYUw@mail.gmail.com> In-Reply-To: <CAF-3MvPRuCdC53VGyPkVFAsKDbVtvdY5JtNwAimRwGvyyNoXog@mail.gmail.com> References: <CADwRVEbVYEXm_FsBxwZvb7DSr=SevCRGpsJE=UsO3bRxZtw9Ew@mail.gmail.com> <CAF-3MvPRuCdC53VGyPkVFAsKDbVtvdY5JtNwAimRwGvyyNoXog@mail.gmail.com>
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2013/8/8 Alban Hertroys <haramrae@gmail.com> > On 8 August 2013 05:56, Michael Schuh <michael.schuh@gmail.com> wrote: > >> 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 >> > > I'm mostly guessing, but what I suspect that happens is that after you > successfully remove da0, the former da1 becomes da0 and any operations on > da1 (or da2 that now became da1) get aborted. > > That you just happen to have exactly identical USB sticks in this case > does not help diagnosing whether that's the case though. > > I'm really hoping this isn't actually what happens here, but it would > explain what you're seeing. > > No. That is not a valid explanation. This happens too if i change the order of the USB-Sticks and pull da2 or da1 instead of da0. The log snippet is exactly from the try and error of your thought.
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