We have an active/active cluster on LUNs (with one named instance on each node and a total of an 100 DBs)
For DR purpose, LUNs will be replicated (with same drive letters) and attached to a standalone server with same configuration of SQL Server but not same Windows Server editions (enterprise vs standard, but i don't think it may be an issue), and the two same named instances pre-installed.
I proposed the Attach / Detach solution, with a script that auto-generate the attach / detach to simplify the tasks, and other scripts to copy Logins, jobs and so on.
Other DBA said a better option will be to rename the MASTER and MSDB databases from the pre-installed named instances on standalone server with _old, and to attach the MASTER / MSDB databases from Cluster node instance to both corresponding named instance in standalone instance.
He said it works and had tested it.
However, I've never heard of such a solution nor can i find any documentation of it.
I would like to hear some other opinions.
Thank you, Kukah