In a recent note, Robert Wright said:
> Date: Thu, 12 Oct 2006 16:33:07 -0400
>
> Lizette Koehler wrote on 10/12/2006 10:57:25 AM:
>
> > I was going to use TRSMAIN to pack some SMF Data from TAPE data set
> > to dasd for FTP process. However the documentation for TRSMAIN
> > states it cannot use tape.
> >
I know I saw that somewhere. But today I can't find it at:
Linkname: TRSMAIN
URL: http://techsupport.services.ibm.com/390/trsmain.html#using
... where do you see it now?
> > I do not understand why this is the case. What is special about
> > TRSMAIN and tape processing. I would have thought it would just be
> > simple BSAM writes of compacted data..... Can anyone shed some
> > light on why tape is not handled by TRSMAIN?????
>
> TRSMAIN tries to include a size of the target data set so that its UNPACK
> processing can do its job. That's feasible if it depends on format 1 and 3
> DSCBs for the input data set. Tape input is harder to handle with the same
> goal in mind.
>
OK. TRSMAIN can't handle tape as raw data sets; that's flatly
stated. But what I thought I saw earlier was that TRSMAIN can
not PACK directly to tape, but must PACK to a DASD data set which
can then be copied to tape.
In any case it doesn't make a whole lot of sense since:
o TRSMAIN is regularly used as an interchange vehicle between sites
with either tape or FTP as the transfer medium. Neither tape nor
FTP preserves format 1 and 3 DSCBs.
o When compression or uncompression is involved, the size of the
source data set hardly gives useful information about the size
required for the target data set.
o The only reliable way to transmit the size of the raw data set
is to include the information in a header in the PACKed file.
if this is done, it can be written to/read from tape as readily
as DASD.
-- gil
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