We have a setup on SDW 6.1/FCP with DOT 7.3.x and planning to upgrade to the latest SDW version because of the upgrade of DOT 8.1 (new controller). Does upgrading SDW require downtime? I know that the service will need to be stopped and restarted, but the LUN themselves may still be available although SDW is not available. Is this correct, or is downtime absolutely necessary?
Also, the existing SDW is on an older version of MPIO (3.31) and possibly needs to be upgraded as well. Does this also require downtime for the upgrade?