On Mon, 15 Sep 1997, Richard B. Johnson wrote:
> Date: Mon, 15 Sep 1997 10:33:34 -0400 (EDT)
> From: Richard B. Johnson <root@chaos.analogic.com>
> To: Linux kernel <linux-kernel@vger.rutgers.edu>
> Subject: SCSI Tape driver
>
>
> To the maintainer of the SCSI Tape Driver, greetings!
> I have noticed a problem starting with kernels this early Spring. If
> there are any SCSI Tape errors, the errors seem to persist until the
> machine is rebooted.
>
> For instance:
>
> # cp /dev/zero /dev/st0
> cp: /dev/st0: I/O error
> cp: /dev/st0: I/O error ! This fails after a few minutes.
> # mt status
> SCSI 2 tape drive: ! This doesn't show any errors
> File number=0, block number=0, partition=0.
> Tape block size 512 bytes. Density code 0x45 (unknown).
> Soft error count since last status=0
> General status bits on (41010000):
> BOT ONLINE IM_REP_EN
> # ! Cleaned drive, inserted brand-new tape.
> # cp /dev/zero /dev/st0 ! Instantly fails without even attempting to
> cp: /dev/st0: I/O error ! access the physical device.
> cp: /dev/st0: I/O error
> # cp /dev/zero /dev/st0
> cp: /dev/st0: I/O error
> cp: /dev/st0: I/O error
> # mt retension ! mt commands go to /dev/st3, they work.
> # mt retension
> # cp /dev/zero /dev/st0 ! /dev/st0 commands instantly error out
> cp: /dev/st0: I/O error ! without even trying to access the physical
> cp: /dev/st0: I/O error ! device.
> # exit
>
> It appears as though the driver "remembers" that there was a previous
> command-completion failure and refuses to attempt the command again.
> Actually, it's not the driver that remembers, it's the controller. The
> driver seems to get sense data before each command rather than after,
> and refuses to execute the new command because of bad sense data. This bad
> sense data was from a previous command.
>
> Sep 15 10:10:32 chaos kernel: st0: Error with sense data:
> Current error st09:00: sns = f0 3
> Sep 15 10:10:32 chaos kernel: ASC=31 ASCQ= 0
> Sep 15 10:10:32 chaos kernel: Raw sense data:
> 0xf0 0x00 0x03 0x00 0x00 0x02 0xec 0x0a 0x00 0x00
> 0x00 0x00 0x31 0x00 0x00 0x00
> Sep 15 10:10:32 chaos kernel: st0: Error with sense data:
> Current error st09:00: sns = f0 3
> Sep 15 10:10:32 chaos kernel: ASC=31 ASCQ= 0
> Sep 15 10:10:32 chaos kernel: Raw sense data:
> 0xf0 0x00 0x03 0x00 0x00 0x00 0x01 0x0a 0x00 0x00
> 0x00 0x00 0x31 0x00 0x00 0x00
> Sep 15 10:10:32 chaos kernel: st0: Error on write filemark.
>
>
> CONFIG_MODULES=y
> CONFIG_NET=y
> CONFIG_PCI=y
> CONFIG_SYSVIPC=y
> CONFIG_SYSCTL=y
> CONFIG_BINFMT_AOUT=y
> CONFIG_BINFMT_ELF=y
> CONFIG_M586=y
> CONFIG_VIDEO_SELECT=y
> CONFIG_PNP=y
> CONFIG_BLK_DEV_FD=y
> CONFIG_NET_ALIAS=y
> CONFIG_INET=y
> CONFIG_PATH_MTU_DISCOVERY=y
> CONFIG_IP_NOSR=y
> CONFIG_SKB_LARGE=y
> CONFIG_SCSI=y
> CONFIG_BLK_DEV_SD=y
> CONFIG_CHR_DEV_ST=y
> CONFIG_BLK_DEV_SR=y
> CONFIG_SCSI_BUSLOGIC=y
> CONFIG_SCSI_OMIT_FLASHPOINT=y
> CONFIG_NETDEVICES=y
> CONFIG_DUMMY=y
> CONFIG_NET_ETHERNET=y
> CONFIG_NET_ISA=y
> CONFIG_NE2000=y
> CONFIG_PPP=y
> CONFIG_EXT2_FS=y
> CONFIG_FAT_FS=y
> CONFIG_MSDOS_FS=y
> CONFIG_VFAT_FS=y
> CONFIG_PROC_FS=y
> CONFIG_NFS_FS=y
> CONFIG_NFSD=y
> CONFIG_SUNRPC=y
> CONFIG_LOCKD=y
> CONFIG_ISO9660_FS=y
> CONFIG_VT=y
> CONFIG_VT_CONSOLE=y
> CONFIG_SERIAL=y
>
>
> Cheers,
> DJ
> Richard B. Johnson
> Analogic Corporation
> Penguin : Linux version 2.1.54 on an i586 machine (66.15 BogoMips).
> Warning : It's hard to stay on the trailing edge of technology.
> Linux : Engineering tool
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> Win-NT : Child's computer interface rewritten in C.
>
>
>