is vdump compressing data even when I don't ask it to?

From: speakmaj@mskcc.org
Date: Thu Nov 21 2002 - 09:21:46 EST

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     Hi all
     
     I find I can vdump a 108 GB fileset onto a TL891 library with a
     40/80GB TZ89 drive and it will stick the whole lot on one tape without
     asking for a new tape.
     
     This is okay, even gratifying, as long as it's all really there. But
     I don't specify compression (-C) , or a blocking factor (-b) , on the
     vdump, and most of the data in this fileset is compressed or gzipped
     already. Is vdump just doing some compression for me anyway?
     
     The 'man vdump' says:
     
     "Under normal usage, the vdump command uses a small amount of
     additional space on the storage device, typically less than 1 percent,
     when a fileset is backed up."
     
     But clearly this is not my experience...
     
     I am doing a 'vdump -D' on 4.0E. Will summarize.
     
     Thanks
     
     John Speakman
     Memorial Sloan-Kettering Cancer Center

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