HP3000-L Archives

May 2002, Week 3

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Subject:
Re: Tape Verification
From:
"Atwood, Tim (DVM)" <[log in to unmask]>
Reply To:
Atwood, Tim (DVM)
Date:
Wed, 15 May 2002 11:07:13 -0700
Content-Type:
text/plain
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text/plain (59 lines) 
What type of tape drive errors? LLIO errors?

Unexpected LLIO error, subsystem: 113, info: -33, ldev: 7
Unexpected LLIO error, subsystem: 111, info: 22, ldev: 7
STORE/RESTORE ENCOUNTERED A POWERFAIL ON LDEV 7

We just went through a very painful experience with LLIO errors reported on
a tape drive. Turned out after swapping the tape drive three times, the
combi-io board, the back-plane, the power supply, and every cable on the
SCSI channel, it was not the tape drive at all. It was a disc drive on the
same SCSI SE path.

Apparently this is a known, though not very well documented problem. There
seem to be competing theories on why this occurs. But the most prevalent
current theory I got seems to go something like this:

1. Certain classes of disc drive failures cause power fluctuations across
the SCSI channel. This may only be for older SCSI SE Seagate Drives, though
this is unclear.
2. DDS3 (and possibly other DDS) drives are significantly more sensitive to
the SCSI channel power fluctuations than the disc drive.
3. So the tape drive is the one to report an error, not the disc.

Even if this does not help you specifically, I wanted to document it for the
HP3000-L archives. Might save someone else a very painful several days.

Timothy Atwood
Holtenwood Computing
http://www.holtenwood.bc.ca/computing/
for Domtar Vancouver Mill
(Opinions expressed are mine and do not reflect Domtar)

-----Original Message-----
From: Ray Cotton [mailto:[log in to unmask]]
Sent: Wednesday, May 15, 2002 6:15 AM
To: [log in to unmask]
Subject: [HP3000-L] Tape Verification


Hi All,

I would like to run a test on my HP 3000 v 6.0.

Problem is tape errors, tape drive new 3 months ago, regularly cleaned.

So i would like to verify the media, without performing a backup or restore.

Any suggestions would be welcome.

TIA

Ray.....

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