so if i can ask further, im gonna make a new LUN, install exchange 2010 and use DAG. if i add a 2nd node to DAG it will automatically get the storage from DAG/Exchange without me having to worry about mapping that lun to the 2nd vm ?
In a DAG setup, each node will have a dedicated LUN of its own. So you'll have to make sure that the new node that is added has LUNs connected to it as dedicated disks. Note that DAG is somewhat similar to a CCR cluster setup so there is no need for shared disks.
Additionally, if you plan to use SME (SnapManager for Exchange) then the same drive letters/mount points should be used on each member server of the DAG.
That's why ideally I'd like Exchange virtualised, because in that case I can rely on following solution stack, not touching Microsoft clustering:
- SMVI for OS / binaries backup
- SME for Exchange mailstore backup
- VMware HA for unplanned hardware failures
- VMware VMotion for planned hardware maintenance
And all that with just single Exchange licence (for mailbox role), one OS to manage & patch and one copy of data!
When we throw SnapMirror into the mix (possibly with VMware SRM), we have site-level resiliency, still maintaining a single copy of Exchange binaries - fantastic simplicity comparing to native Exchange clustering!