🚀 go-pugleaf

> 
> How can I control the compression on our tape drive? Can it be
> done with software? Any leads are helpful.  It's a Connor
> connected to a DEC5000/200 running Ultrix4.2A.  
> 

Thanks to all who replied.  There are at least 3 different places
were compression can be used.  One, you can compress "by hand" using
the unix compress command or gzip then create the tape archive.
Two, you can use  the device file.  For example, in Ultrix4.2A we
have rmt0h, rmt0m, rmt0l for high, medium, and low compression,
respectively.  I was not able to test if using a different device
file actually made a difference (it's suppose to).  Finally, the
tape drive itself may be capable of compressing the data.

In my case it was the hardware compression that was the problem. I
was trying to read tapes created on a 4Gig drive using a 2Gig drive.
When I replaced the 2Gig drive with a 4 I could read all the tapes
independent of which device file I used to create them.

Apologies for taking so long to summarize.

 - Roger

+------------------------------------------------------------+
|Roger B. Rouse                      + # # # .               |
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|Arizona State University        #       + +     #           |
|Dept. Physics & Astronomy           + +   + #     +         |
|Tempe, Az, 85287-1504               +       +     #         |
|                                  .     . @ .     .         |
|rouse@sevens.la.asu.edu           #     +       +           |
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|Work: (602) 925-7433                #     + +      .        |
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|                                        . # + # .      Rouse|
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