Russel,
        can you clarify something for me please?
Your sig states that you support CA-1, and in your post you say that folks 
running a tape management system (including CA-1) are safe, but you go on 
to say that you have 2 clients (by deduction CA-1 customers?) who have 
lost data as a result of this issue.
How did this occur?

I took a look at our SMS managed tape setup and see that we don't pass a 
management class to tape datasets, and in fact the ACS routines set 
management class to NULL so I guess we are safe anyhow.
Incidentally, the IBM Redbook Enterprise Tape A Practical Guide I have 
says :

Since no management class attributes are available for tape cartridges, 
defining management classes is optional and not recommended.

Regards,
         Steve O.

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