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
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