Importing a cluster dynamic disk group fails after 5 minutes with "An unexpected error occured" when using iSCSI devices and at least one device is missing at the time of the import
Article ID: 100004787
Updated On:
Description
Error Message
V-40-49408-1 An unexpected error occured
Cause
As part of the import process, Storage Foundation runs a SCSI reservation status check on the devices configured in a disk group. As soon as one iSCSI device is missing, this call is not returned by the iSCSI driver.
Resolution
An update is available for the iSCSI driver here:
https://support.microsoft.com/en-us/kb/982674
Issue/Introduction
In cluster configurations mirroring data between storage arrays, it can be necessary to import a disk group even when members of the disk group are reported as "Missing Disk". If only half or less than half of the members are present, Storage Foundation by default prevents the import and reports V-76-58645-585: Failed to reserve a majority of disks in cluster dynamic disk group.
If your cluster dynamic disk group is using iSCSI, the import of a degraded disk group can even completely "hang". This ends after five minutes reporting error "An unexpected error occured" without having imported the disk group.
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