Had an issue over the weekend, one of our mailbox servers kept bluescreening. This particular VM has the C: and D: on storage iSCSI SAN.
Tried running checkdisk on C: and it bluescreened as well. HyperV manager shows the error “Cannot connect to virtual machine configuration storage”
The D: drive is showing uninitialized in disk management, and gives an error when trying to initialize.
Started getting “Windows – Delayed Write Failed” messages. Compression is not turned on on the HyperV servers local storage.
The iSCSI connections are provided by HP Lefthand SAN, 2 node cluster. One of the SAN nodes went down yesterday.
HP Lefthand Support Phone Number
putty into SAN node : port 16022
2 Lefthand SAN nodes
Each has a single 100mbit link….
When we brought SAN2 back online state, issue was resolved
My assumption is that the SAN couldn’t replicate fast enough with the load they have with Exchange on them, plus replicate the changes to the other SAN node, so they were out of sync when the 1 SAN node went down thus causing issues.