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.


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Laurence Chiu
Sent: Thursday, November 25, 2021 4:02 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: How long would it take to write a LTO 6 tape or how long is a piece of string?

There's probably no answer to this question but I thought I'd try it out anyway. We have 24 terabytes of data sitting in a Protectier VTL.

This need to be migrated off and moved to another data center. Because of geographic constraints it's going to be done using LTO 6 tape. The LTO 6 tape drive will be fiber channel connected to the same SAN fabric as the power server and Protectier VTL.

In case anybody asks why we are using LTO 6 because it will be a one-off operation and once the data is copied off the drive will no longer be required and in the target location we only have an LTO6 tape drive attached to the server.

We will probably use the command DUPMEDBRM to copy the data off the tape.
As part of assessing the amount of time it's going to take and therefore how long our service provider needs to be engaged I need to come up with some sort of number for how long it's going to take to dump the data. So far they haven't come up with any numbers.

I don't really know how to come up with that metric but perhaps somebody with experience in this can provide some guidance?

The server is a Power 6 server and will not be running any other application so it can be fully dedicated to the backup.

Any ideas appreciated.

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