That's really helpful.

The FC for the source and target devices are on different channels via a
SAN Director. But I suppose all the data has to go into the IBI (Power 6
V7.1) box before being written to the tape.

Those numbers are really helpful. I had planned on 5-6 tapes with normal
compression and 40 hours is in the target range of what I had estimated.

Thanks

On Fri, Nov 26, 2021 at 1:36 PM Steinmetz, Paul via MIDRANGE-L <
midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

What is the speed of your FC?
Will the same FC be used for both the source and target of the DUPMEDBRM,
if so, that will lengthen the time required.
Here are some performance numbers from 2016 of my LTO5 to LTO7 migration,
using 8gb FC on a P7.

A full LTO5, 3tb compressed, 280mb/sec.
A full LTO6, 6.25tb compressed, 400mb/sec
A full LTO7, 15 tb compressed, 700mb/sec

DUPTAP of a full LTO5 to LTO5 volume previously was 10 hours.
DUPTAP of a full LTO5 to LTO7 volume is 4 hours 45 minutes.
DUPTAP of a full LTO7 to LTO7 volume is 18 hours.

Your process should take 4 to 5 LTO6 volumes, each volume about 10 hours,
so about 40 hours total.




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