claudio,

If you want to start more processes for the migration you have to look at
two things:

first is the migpr parameter, this is what I use:

UPD STG ARCHIVEPOOL LOWMIG=0 HIGHMIG=0 MIGPR=3

Second in your device class there is a parameter called mountlimit this
should be put to for example three.

UPD DEVCLASS ONSITE MOUNL=3

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met vriendelijke groeten, regards et salutations,
met vriendelijke groeten, regards et salutations,
Finn Leijnse
ISES/31 - Central Data Storage Management
Shell Services International bv.
Leidschendam
email: Finn.F.Leijnse AT IS.shell DOT com