SnapDrive snap-in is the software module that integrates with the Microsoft Management Console (MMC) to provide a graphical interface for managing virtual disks on the filer. If the iSCSI management is not seen, try increasing the paging space by following these steps:
After increasing the maximum paging file size, click OK.
If the problem persists, try the re-installation procedure of the iSCSI initiator found in 2011913: The SnapDrive service fails to start with Error 6: This handle is invalid. Also refer to the Release Note.
This may also happen if the SnapDrive service loads before the Microsoft iSCSI Initiator service loads. To fix that problem, set the SnapDrive service to be dependant on the iSCSI service.