On a Saturday of my choosing, our HW service provider is going to take our
System i 520 from 2 8-drive RAID 5 sets to 2 8-drive RAID 6 sets w/hot
spare. Yes I'm taking a SAVE21 before.

Building the RAID 6 will be time-consuming. My question is this: Is the
amount of time it will take based on the size of the *drives*? Or on the
amount of *data* on the drives?

I'm asking because we have a virtual tape drive (TAPVRT01) that is taking
up 123GB. If I understand virtual tape correctly, it cannot be "shrunk."
I could remove that device (or whatever "piece" of the image catalog
structure) beforehand and recreate it afterward. I could also do other
cleanup, like old job logs, etc.

But only if it actually saves time. If the RAID 6 build time is tied to
drive size to where a cleanup won't make a difference, then I won't bother.


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