Networker

Re: [Networker] SCSI bus resets rewind tape in SAN?

2004-11-12 14:38:07
Subject: Re: [Networker] SCSI bus resets rewind tape in SAN?
From: Teresa Biehler <tpbsys AT RIT DOT EDU>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Fri, 12 Nov 2004 14:37:13 -0500
You'll need to view details to see it.   Also, I believe this was added
in v7 or v7.1.

-Teresa


-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
On Behalf Of George Sinclair
Sent: Friday, November 12, 2004 12:09 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] SCSI bus resets rewind tape in SAN?

I don't see this option in our jukebox settings under the GUI. We're
running 6.1.1 for Unix. Just curious if this option was added later? Any
workarounds?

Another thing here, though, and that is what happens if the tape is
rewound -- maybe some kind of bus reset or other glitch -- but maybe not
all the way and NetWorker doesn't know about it? Seems to me in that
case the label would not be overwritten since it didn't go back that
far, but perhaps other data on the tape could be overwritten the next
time NetWorker writes to it if it's not aware that it was partially
rewound? Anyone seen this happen?

Couldn't one simply check the mountability off all tapes each week to
ensure the overwriting of the label has not occurred?

George

Teresa Biehler wrote:
>
> To check for this, enable the "Verify label on unload" setting on the
> jukebox definition.  It won't prevent the problem from happening, but
it
> will write messages to /nsr/logs/messages when a tape label is
> overwritten and cannot be read.  The messages are something like:
>
> NetWorker media: (info) expected volume '000002' got 'NULL'
>
> Depending on your configuration, this is still possible in the latest
> versions of Networker.
>
> -Teresa
>
> -----Original Message-----
> From: Legato NetWorker discussion
[mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
> On Behalf Of Terry Lemons
> Sent: Friday, November 12, 2004 8:33 AM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] SCSI bus resets rewind tape in SAN?
>
> Hi Robert
>
> Oh, yes.  I was burned by that one years ago.  Later versions of
> NetWorker,
> I believe, correctly detect and handle this problem.  Check out the
> Release
> Supplements.  I don't know if a patch was very made to the V6.1 stream
> for
> this problem.
>
> tl
>
> -----Original Message-----
> From: Legato NetWorker discussion
[mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
> On
> Behalf Of Robert Maiello
> Sent: Friday, November 12, 2004 8:21 AM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] SCSI bus resets rewind tape in SAN?
>
> 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?
>
> Thanks for any info.
>
> Robert Maiello
> Pioneer Data Systems
>
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Note: To sign off this list, send a "signoff networker" command via email
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http://listmail.temple.edu/archives/networker.html where you can
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should be sent to stan AT temple DOT edu
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