RE: CD mastering via tape using compression

["Andy Nolen-Parkhouse" <aparkhouse@xxxxxxxxx>]

Peter,

Does your tape device support compaction?  If you specify *YES for
compression and *DEV (the default) for compaction, the system will both
compress and compact your data.  If I recall correctly, compaction is
handled exclusively by the tape device and would not translate to a CD
drive.  If your device supports compaction, specify *NO for the compact
parameter and see if it works.

Regards,
Andy Nolen-Parkhouse

> On Behalf Of Peter Dow
> Subject: CD mastering via tape using compression
>
> I've written a little command and program based on IBM's example at
>
> http://www-1.ibm.com/servers/eserver/iseries/optical/cdrom/restore.htm
>
> which is basically:
>
>     -use API QlpHandleCdState to turn on the CD mastering mode
>     -SAVLIB with DTACPR(*YES)
>     -use API QlpHandleCdState to turn off the CD mastering mode
>     -CRTPF tempfile with record length 28672
>     -CPYFRMTAP to tempfile with blocklength and recordlength 28672
>     -FTP tempfile to a PC
>
> At this point, using Nero software, I burned tempfile onto a CD, stuck
it
> in
> the AS400 CD drive, and tried to do a RSTLIB.  After listing each
object
> in
> the saved library and stating that it couldn't restore it, it gives
> message
>
> Message . . . . :   Error decompressing file /tempfile.
>
> Cause . . . . . :   An error occurred while trying to decompress data
read
>   from a tape, diskette, or optical volume.  The data should have been
>   compressed when it was written to the file.  The error occurred
while
>   processing file *N in library *N on device OPT02.
> Recovery  . . . :   If the data writing operation did not complete
> normally,
>   create the input file again. Verify that the correct set of volumes
is
>   available.  Try the request again. If the problem continues, report
the
>   problem (ANZPRB command).
> Technical description . . . . . . . . :   Conditions that can cause
this
> error
>   include: 1. Mounting an incorrect continuation volume for a
multi-volume
>   file. 2. Using a volume which did not compress properly because the
> output
>   operation did not complete normally.
>
> Now, this same process, with DTACPR(*NO) on the SAVLIB command, works
just
> fine.  More interesting stuff -- a DSPTAP DEV(TAP01) DATA(*LABELS)
> OUTPUT(*PRINT) of the tape file for both the compressed and
non-compressed
> versions shows a record length of zero, and a block length of 32760.
This
> is odd, because the documentation at the URL noted above says use
28672.
>
> So I tried 32760 instead, and the RSTLIB got an MCH0601 error, clearly
not
> the solution to my problem.  IBM's documentation has a rather large
> paragraph talking about using CPROBJ instead of DTACPR(*YES), but ends
up
> saying use one or the other, but not both.  Since CPROBJ does not work
on
> data files, I would like to be able to use DTACPR(*YES), but it
clearly
> doesn't work, in spite of the documentation implying otherwise
(although
> their example has DTACPR(*NO)). Am I stuck using 3-4 times the number
of
> CD's I would need if DTACPR(*YES) worked?  Or does anyone know what
the
> problem is?  An associate of mine suggests that it's something wrong
when
> writing to the CD.
>
> tia,
> Peter Dow