When you mean swap cache cards, do you mean something like upgrading cards slots to higher cache capacity?
What Symmetrix model are you working with on this upgrade?

This will help us give you a better baseline on the answer.

Thnx.

PSE Chris

I have done numerous upgardes on DMX3.
Each upgrade will require 3 scripts to be run.
Lets say you are doing a 32GB to 64Gb upgrade.
First 2 scripts will swap out the 32GB cards.
Although you have the new 64GB cards in the system the code is not aware of the new cache yet.
3rd script is to upgrade cache.
This takes around 40 minutes in total to run all 3 scripts.
The repalce srcipts take less than 10 mins each the upgarde script is a little slower.
Allow another 10 mins each side for the CE to run Keys 2 SCS.
If you are upgarding 2,3 or 4 memory pairs then you would not run the upgrade script till you have all the new boards in.
Hope this helps.