> 1. I have long suspected that IBM is mature in the utilization of computer
> resources, such that 94% compression possible on a PC is more an indication
> that PC objects waste space than a problem with compression algorithms.

I am sorry if I wasn't clear. What I compressed 94% was a SAVLIB
from an AS/400. It wasn't a file originating on a PC. I captured
the SAVLIB through my tape emulator. It was written without
compression to the tape interface by IBM's SAVLIB command.

I compressed another library only 60%, this was program sources
and object code.

And yes I know that there is no error in my process - because I
unzipped them and restored them through the same interface. I've
done this dozens of times.

It's the PC object (the zip file) that is not wasting space.

I was tryin to figure how much AS/400 data would fit on a PC 100
GB hard drive. At least 300 GB of AS/400 libraries will fit on a
PC 100 GB hard drive, and as much as 1,600 GB ( 1.6 TB) is

And it means that between 1.8 Gb and 10.8 GB of AS/400 data will
fit on a single CD-R. I just bought a 24X CD-r writer. Suppose
you get compression somewhere in the middle - say 5 GB per
CD-ROM. Back up your 20 gb of AS/400  data nonstop to the VTS
system, then write out all the data in about ten minutes.

Of course, IFS files backuped to tape will not compress that
well, because most images, zips, and many modern word documents
are well compressed also.

Brad Jensen

Lasrvault Report Archiving

Brad Jensen
Electronic Storage Corporation Tulsa OK USA

LaserVault Report Retrieval & Data Mining - Add distance learning to
your site with easy course preparation

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