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  2. MIDRANGE-L
  3. November 2018

RE: P7 V7R3 to P9 V7R3 migration recommendations / suggestions

Performance has five things involved: disk, memory, processor and tape
and the fifth being the cabling, SAN, I/O port going to the tape. Let's
assume that one saves access paths, it's been changed to the default many
releases ago.
In a restore the biggest constraint will be tape, then disk. It takes an
awful lot to stress the connection speed to the tape library. Memory and
processor concerns follow behind.
We're talking about tape libraries with multiple drives in them. One at a
time or four at once should not matter to the tape library, since you have
multiple drives.

The biggest reason for the semi restricted state is that you don't want
users on it trying to do stuff during a full system restore. Not really
to speed up the restore, but it probably helps.


Rob Berendt

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