On 17.03.2012 01:00, /me wrote: > A system I manage, running openSUSE 11.4 x86_64 with vanilla kernel > 3.2.8, uses Bacula 5.0.2 for backing up to a Tandberg TS400 standalone > LTO-2 drive connected to an Adaptec 29160 SCSI Adapter, so far using > LTO-1 tape cartridges as the backup volume doesn't require LTO-2 ones yet. > > Recently I added the line > > Offline On Unmount = yes; > > to the Device resource in bacula-sd.conf since I read on this list that > this is supposed to work alright now. Since then, backups reaching the > end of a tape have reported > > --------8<--------8<--------8<--------8<--------8<--------8<--------8<-------- > 13-Mar 11:06 xenon-sd JobId 333: Error: block.c:577 Write error at > 19:34967 on d > evice "LTO-2" (/dev/nst0). ERR=Input/output error. > 13-Mar 11:06 xenon-sd JobId 333: Error: Error writing final EOF to tape. > This Volume may not be readable. > dev.c:1745 ioctl MTWEOF error on "LTO-2" (/dev/nst0). ERR=Input/output > error. > 13-Mar 11:06 xenon-sd JobId 333: End of medium on Volume "p042-1" > Bytes=59,254,594,560 Blocks=918,504 at 13-Mar-2012 11:06. > --------8<--------8<--------8<--------8<--------8<--------8<--------8<--------
I have now removed the Offline On Unmount option again, and the errors are gone. So there's something fishy with that option. The failure above was accompanied by these kernel messages: Mar 13 11:06:43 xenon kernel: [981814.742648] st0: Sense Key : Medium Error [current] Mar 13 11:06:43 xenon kernel: [981814.742677] Info fld=0xfc00 Mar 13 11:06:43 xenon kernel: [981814.742688] st0: Add. Sense: Excessive write errors Mar 13 11:06:43 xenon kernel: [981814.762965] st0: Sense Key : Medium Error [current] Mar 13 11:06:43 xenon kernel: [981814.762987] Info fld=0xfc00 Mar 13 11:06:43 xenon kernel: [981814.762997] st0: Add. Sense: Excessive write errors Mar 13 11:06:43 xenon kernel: [981814.783640] st0: Sense Key : Medium Error [current] Mar 13 11:06:43 xenon kernel: [981814.783662] Info fld=0xfc00 Mar 13 11:06:43 xenon kernel: [981814.783672] st0: Add. Sense: Excessive write errors Mar 13 11:06:43 xenon kernel: [981814.803884] st0: Sense Key : Medium Error [current] Mar 13 11:06:43 xenon kernel: [981814.803906] Info fld=0xfc00 Mar 13 11:06:43 xenon kernel: [981814.803916] st0: Add. Sense: Excessive write errors Mar 13 11:06:43 xenon kernel: [981814.864753] st0: Sense Key : Medium Error [current] Mar 13 11:06:43 xenon kernel: [981814.864778] Info fld=0x1 Mar 13 11:06:43 xenon kernel: [981814.864788] st0: Add. Sense: Excessive write errors Since I removed the Offline On Unmount option, there wasn't a single "st0: Sense Key" message anymore. Initially I suspected that things would go wrong once the end of a tape is reached, but the very tape "p042-1" that errored out at 59,254,594,560 bytes above has now accepted the exact same fileset with 62,892,490,752 bytes without an error. I am at a loss how to explain that. Why would Offline On Unmount affect write operations in such a way? Is the drive to be blamed? Or is it a bug in the storage daemon? -- Tilman Schmidt Phoenix Software GmbH Bonn, Germany
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