OK, my summary of this and all previous posts:
It seems you are being misled by the comment "/* 10 DUMP COPIES PER TAPE
*/". It should read "/* 10 VOLUMES PER TAPE */"
For each DUMP CYCLE/DUMP CLASS combination, at least 1 new volume will be
used.... guaranteed.
i.e. Each DUMP CYCLE will use (a minimum of) N volumes where N is the number of
unique DUMP CLASSES processed during this DUMP CYCLE.
Each DUMP CLASS processed will use as many physical tapes as required
(subject to stack(nn)) to hold the data.
If the volumes being dumped do not fit on a physical tape, an additional
physical tape will be requested to hold the additional data and logically
concatenated.
For the purposes of discussion, if STACK(10) is specified, and 11 volumes are
being dumped, this *would* be considered as "another DUMP CLASS" and require
another tape; i.e. N=2
2 dump tasks would be used, 1 for volumes 1-10 (1 or more tapes), and another
for volume 11 (1 or more tapes). Each dump task creates a "logical dataset"
that may span multiple volumes if required.
There will be 2 "logical datasets" created in the scenario above.
STACK(NN) is the *maximum* number of unique volumes that dfHSM will place on
this "logical dataset".
The "logical dataset" may (or may not) live on multiple physical volumes.
BTW STACK(10) is very low considering the high density media you are proposing.
The upper limit of STACK(nn) is 99 prior to z/OS 1.12. z/OS 1.12 and later have
a limit of 255.
AFAIK, there is no way to "reuse" a dump volume until it has been released.
i.e. 16 days after creation (or HSEND DELVOL command. See the Fine Manuals.)
ALSO, AFAIK, there is no way to combine multiple dump classes on a single
physical tape.
HTH,
<snip>
DEFINE DUMPCLASS(MIGDMP /* FOR CLASS MIGDMP */ -
UNIT(ATL90) /* USE ATL90 DEVICES */ -
RETPD(16) /* KEEP DUMP COPIES FOR 16 DAYS */ -
AUTOREUSE /* MAKE VOLUMES AVAIL FOR REUSE */ -
NORESET /* DO NOT RESET CHANGE BIT */ -
STACK(10) /* 10 DUMP COPIES PER TAPE */ -
NODSRESTORE /* NO SINGLE DATASET RESTORES */ -
FREQUENCY(5) /* MIN DAYS FROM LAST VOL DUMP */ -
VTOCCOPIES(1)) /* KEEP 1 VTOC COPY DATASET */
/* THIS DUMP CLASS IS FOR */
/* THE WEEKLY DUMPING OF ML1 */
/* VOLUMES */
/*
</snip>
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