Hi, Tomislav,
there are two ways to do this with only Storage Foundation mechanisms.
The first one would be to make on the primary side an additional mirror to your existing volumes living on the new storage device. After syncing to the "new primary side raid system" you can delete the mirror pieces on the "old primary side raid system". Quite simple. No Volume is changing name and the storage landscape is not altering in logical way.
The second possible solution is to make an additional secondary site for the Volume Replicator on the new raid system. Unfortunately to do this you need an additional server for the time of migration as well. Ah, and yes, an additional license for Storage Foundation, at least temporary. When this additional secondary site is synced you can promote this to the new primary and after a time of checking and testing you can eliminate the former original site what is now a secondary.
The problem of both of these scenarios is that you have to provide two raidsystems for a certain time. So an "in place change" of the raidsystem is not that easy. There are more than one stage of mounting and syncing and consuming energy and fibrechannel controllers ... And, much worse, is is certainly not to be done in one day (or night).
Maybe all this effort can be avoided with a short downtime (some hours, when all steps are very good planned and prepared). Taking the replication to a paused state, making a backup of the original data space, shutting down the old raidsystem, bringing the new one in place and providing the LUN's, restoring the data and taking care for the Volume Manager volumes are online again (thank there is this logical layer volume) and restarting the replication is a quite usable way, depending of the amount of data we talk about.
Whith all those ways you have advantages and misadvantages. But they all have one thing in common: you cannot change the number of volumes (so you cannot consolidate to a smaller number of LUN's) and therefore your logical structure of the storage keeps the same.
Ah, another thing they also have in common: planning is essential!
Hope those little thougts are helpful.
Roger
