You can provide both machine access to the luns, assuming you know which machine has control at all times..
But, I prefer it be included as part of the failover procedure as a safety to make sure the secondary doesn't try to mount the luns
In order to move placeholders to a new location you must use the FSA utility, examples are from the link below on page 101. A restore won't work.
ftp://exftpp.symantec.com/pub/support/products/Exchange_Mailbox_Archiving_Unit/351439.pdf
Agreed with previous comments.. Definitely run Performance counters against CPU, MEMORY, DISK to see what is causing this slowness.. Especially when RDP is having issue
Sure it does, that's how Veritas clustering achieve site to site failover, by clustering the application across the 2 physical sites along with block by block data replication.
Below is a link on how it's done with SQL, but its the same steps for Ex...