Re: TRSMAIN question

In a recent note, McKown, John said:

Date: Tue, 30 Jan 2007 15:35:07 -0600

Is there any documentation on the compression algorithm used by TRSMAIN?
Or how effective it is? I.e. if I have 21 MEDIA2 (3490E) tapes worth of
printable data, can I estimate how many compressed tapes that will take?
And is there anyway to ftp that to an ASCII based server and uncompress
it? Yes - this relates to my previous question about RACF IRRADU00
reformatted records.

The documentation on TRSMAIN is, well, terse. Many years ago, I
did a comparison and some flavor of Terse was the best compressor
I found; better than zip, better than UNIX compress. I didn't
compare it to bzip2; for all I know Terse may be similar to bzip2.

On an ASCII platform you'd have better chance of finding uncompress
or gunzip.

It's a shame TRSMAIN refuses to write to a POSIX pipe which could
eliminate the need for intermediate storage on z/OS. How does one
submit a Requirement against TRSMAIN?

If you can mount the the USB drive on an FTP server, I'd suggest:

MEDIA2 -> IEBGENER | compress | FTP //DD: -> network -> USB

with no intermediate storage on z/OS. This should work if IBM
has fixed the various APARs I've started against FTP.

Your report size appears to be growing exponentially.

-- gil
--
StorageTek
INFORMATION made POWERFUL

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