ISTR reading in the fine manual that "command activities (specifically migrate 
and backup)" are single threaded...IOW BAD
I believe command recall is  an exception to the above.

HTH,

<snip>
We've got a scenario where we should do a backup of some data to data sets and 
after succesful backup send the previous copy to ML2 (so we've got only the 
latest on DASD).

Since there are multiple backup jobs, we've tried to send a TSO command (via 
IKJEFT01 in the jobs) to HMIGRATE the old data sets, but as it turns out, HSM 
mounts only one tape per LPAR (if jobs are distributed to 2 LPARs => 2 parallel 
migrations).
Since that's a bit slow, we're looking how to get some more instances running.
</snip>

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