> I'm interested in this too, since I've got a similar situation.
> (Qualstar Library / Linux / Networker 7.0) AIT-2 media performs
> erratically in the AIT-3 and seems to vary with the tape.
Matthew,
The symptom of our problem sounds like what you are experiencing. The
amount of data written to our AIT-2 tapes varied widely, and there didn't
appear to be any specific pattern. Sometimes a tape would be marked full
after, say, 25 Gbyte of data, and when the same tape was recycled and used
again, it would be marked full after, say, 40 Gbyte, and so on. It was a
mystery as to why the capacity of our tapes weren't higher, and why tape
capacity wasn't at least consistent.
Here is a snapshot of the amount of data that some of our tapes were able to
hold during two tape rotation cycles:
Rotation Cycle #1 Rotation
Cycle #2
Tape Data written (Gbyte) Data written (Gbyte)
----------------------------------------------------------------------------
--------------
C75733 18 0.47
C75734 30 33
C75735 9.07 31
C75736 27 46
C75737 19 16
C75738 16 12
C75739 20 18
C75740 1.69 34
C75741 45 39
C75742 42 40
C75743 24 25
C75744 26 45
C75745 26 29
The next 4 tape rotation cycles for the above tapes were just as sporadic as
shown above.
After upgrading our firmware on our AIT-3 tape drives, we got 49 Gbyte of
data (compressed, about 105 Gbyte uncompressed) on each of the above tapes.
--
Craig Ruefenacht
UNIX Systems Administrator
USANA Health Sciences, Inc.
(801) 954-7559
> mht
>
>
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