Hello,   Yes, you can move them live.  The logout/login is required since you have moved the data to a different member.  This is handled as part of the iSCSI spec.  It's called ASYNC logout and Login redirect.   The array will instruct the initiator to logout a specific session.   When it goes back to the discovery address it's redirected to the new physical port.   All logins to an EQL array are handled this way.  FYI: If there are many volumes on Tier1, you can Merge Tier1 and Tier3 in one step.  Then move one 3900 member  to a temp pool, which will leave all the data on that member behind.  Then you can delete that member and repeate for the last 3900.    It's fewer steps this way and you can start it at night and let it run overnight.  The Merge process will be near instaneous.  Since no page movement starts right away.  So merge, then select a member to move to an empty pool.  This will save time restriping the data across the now three member pool.  Either way works fine. Regards, 
Hello, I want to move some volume across storage pools this weekend but am starting to wonder about something. I have 3 storage pools all in the same group. Tier1  (2 ps3900xv's) Tier2  (1 ps4000e and 1 ps4100e) Tier3  (1 ps6100xv)  We are going to retire the 2 3900's because they are EOL. I have 4 volumes I want to move from Tier1 to Tier3. 3 of the volumes are my Exchange 2010 database and the 4th volume is my SQL databases. What I am wondering is can I move these volumes with Exchange DB's and SQL DB's live? From what I have been reading is Dell claims you can. The part that concerns me is I moved a test volume and noticed that the iSCSI connections terminate (log out and back in) for a split second and I don't want that affecting the databases.  Thanks for any advise! 
Equallogic Storage Pools - Moving Volumes