I'm looking into methods for HSM for my company.

One of the requirements I have is that restores must use the maximum speed we 
can achieve.

I have looked at several TSM pages, but couldn't find something that explicitly 
explains how parallel restores (the NQR option) are going to be performed.

My specific question is: Do all copies have to go over the server or can they 
go over different paths?

For example:
2 files (F1,F2) are to be restored to two different primary systems (P1,P2) 
from 2 different secondary storage systems (S1,S2). Does TSM support a physical 
connection like the one shown bellow in a) or does it have to be a connection 
such as the one shown in b)
a)
P1 <----- F1 ------ S1
P2 <----- F2 ------ S2

b)
P1 <--F1---\                            /---F1---- S1
                    ----- Server ------
P2 <--F2---/                            \---F2---- S2

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