Thanks terry, darren..

Would a drive losing power bewteen writing cause this to happen?

To look for over high utulization seems like a good check.  Still, how
does one know their drives aren't getting rewound without checking all
tapes??


Robert Maiello
Pioneer Data Systems

On Fri, 12 Nov 2004 08:43:51 -0800, Darren Dunham <ddunham AT TAOS DOT COM> 
wrote:

>> Setup is Solaris 8, LTO1 drives connected via JNI HBAs,  Networker 6.1.3.
>>
>> Has anyone had a problem where a scsi bus reset rewound the drive without
>> Networker's knowledge?   Any logs or ways to trace this?
>
>I have no evidence that "scsi bus resets" or anything else in particular
>was the cause, but I have seen tape corruption of older versions of
>networker that appeared to be caused by unexpected rewinds.
>
>If I had tapes that appeared to be much higher utilization than normal
>(say over 100GB on a DLT 7000), then I'd run a quick 'scanner -inv' on
>the tape.
>
>Some of them would report that the first file on tape was file 87 (or
>so) instead of 2.  That means that tape files 2 - 86 were written to the
>tape, the tape was (somehow) rewound, then Networker began writing to
>the tape again.
>
>Note that this sequence of events did not cause Networker to overwrite
>the label at the beginning of the tape, just the contents.  I never
>found any logs that suggested such an event had occurred.  Just some
>tapes that started getting beyond phenomenal compression.
>
>I have not personally seen this on 6.1.2, but I have seen it on older
>versions (It may have been 5.5 even).
>
>--
>Darren Dunham                                           ddunham AT taos DOT com
>Senior Technical Consultant         TAOS            http://www.taos.com/
>Got some Dr Pepper?                           San Francisco, CA bay area
>         < This line left intentionally blank to confuse you. >
>
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--
Note: To sign off this list, send a "signoff networker" command via email
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