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Rob,

There's nothing inherent to stream files that would make them less
compressible. It would really depend on the stream file itself. Binary
files, such as .EXE or .DLL are usually not very compressible. Other
files, such as .JPG or .JAR are already compressed.

Charles


On Mon, Jun 10, 2013 at 8:30 AM, <rob@xxxxxxxxx> wrote:

I am noticing that DB2 or 'traditional' stuff really compresses when
saving to tape but stream file stuff doesn't.
I have one system that is primarily 'traditional' stuff and PRTERRLOG
TYPE(*VOLSTAT) VOLTYPE(3590) after a full system save says it fit
3,087,925 on one LTO4 tape and that got everything.
I have another system that's primarily stream file stuff and it only fit
1,024,936 on one tape and 689,570 on the second.
Full system saves, identical control groups. Saved with BRMS.
Perhaps stream file are generally more compressed while DB2 stuff keeps
all that non variable length data all filled with blanks and stuff.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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