Question: Why did I lose my datastore?
The environment is (2) esxi hosts (5.0.1, and 5.1) with iSCSI (Synology software iSCSI)
In the process of shutting down and moving hardware (no changes) , the iSCSI datastore was not found after startup by either host. iSCSI LUN was found and all paths checked out, however it was unable to mount datastore.
The only way I was able to mount datastore was to re-signature datastore with new UUID. This datastore is only used for backup, and we were able to make necessary changes. Just need to understand what happened.