We moved from emc to NetApp last week which involved migrating the data between SANs via some device. We had two options around DTC and quorum:

1. we could create a new disk on NetApp for each and then change the resources in the cluster. This would have involved several steps for each as we wanted to keep the current drive letter - so would have had to use a temporary letter on NetApp, change dtc and quorum to the temporary disk, drop the original disk from emc and then recreate the original drive letter on NetApp, basically rebuilding the quroum and DTC.

2. We could sync the LUNs, take the quorum and DTC offline, switch the disk to NetApp and then bring the quorum and DTC back online.

We chose option 2. There was no downtime of the cluster and no configuration changes of resources in the cluster as it was all done at the SAN level