LUN config for virtualized Exchange server

Hi All,
What would be the preferred LUN congfiguration for a virtualized Exchange server. It will be a 2 server multi-role configuration on a 3 node hyper-v cluster. 1 LUN per database. Exchange servers will not be configured to be highly available. Failover on
application level.
1. Present the LUN as an iscsi target to the hyper-v host and create a VHD on it for the Exchange server.
Benefit: VHDX is flexible
Drawback: No snapshotting of database via backup app etc.
2. Present the LUN as a pass-through disk to the Exchange server via the Hyper-v host
Benefit: no hyper-v overhead?
Drawback: not flexible
3. Add a vnic to the Exchange server and configure the iscsi initiator on the exchange server.
Benefit: no hyper-v overhead 
Drawback: Little more complex configuration
Which one is best? I would prefer option 2, but I might miss something?
Je suis er even nie

Honestly, it's tough to say which one is the best option, b\c it really depends on you and your environment.  I typically do deployments on Vmware and not Hyper-v as alot of the clients I work with already have VMWare entrentched in their environment,
but it's really the same concept.  Typically we use option 1, where we let Vmware handle the iSCSI connections to the SAN and we present the storage to the VM as vmdk file.  Option 1 eliminates the complexity and is usually the easiest to configure
for people and allows for easy administration.  
Since you mentioned backup snapshots, I would stay away from option 2.  Depending on the method and application you are using for backup passthrough disks can cause issue.  If you were initiating the hardware snapshot from inside the VM I believe
that would fail with a passthrough disk as well since the guest is not communicating directly to the SAN.
Option 3 would allow you to take hardware snapshots of the drives that the database reside on and you would do all the management of the device from the SAN level.  This would be the most complicated to set up since you have to zone it out and make
sure the guest can communicate with the SAN.
If it was me, I would probably deploy option 1 since that usually seems to be the easiest to manage and configure and in my experience, the less complex you make something, the easier it is to manage.
 

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