Deleting a VSS Snapshot Occasionally Results in an Error Condition in the Group Manager Due to iSCSI Log Off Failure
Occasionally, when the Microsoft Volume shadow Copy Service (VSS) receives a request to delete a VSS snapshot from the EqualLogic VSS Provider, a
Requested target not found error is displayed in the Group Manager, even though the snapshot has been deleted. You will most likely see this error message after running backups using third party backup software.
In normal operations, the EqualLogic VSS Provider first logs off the iSCSI session for the snapshot, then offlines and deletes the snapshot. However, when the iSCSI log off fails, VSS continues to delete the snapshot because the iSCSI session log off failure is regarded as insignificant and is ignored.
When an iSCSI logoff session fails, the iSCSI initiator attempts to reconnect to the target. When this occurs, a
Requested target not found error is displayed in the Group Manager, as shown in the following figure.
Figure 1. Error Message in Group Manager Event Log
Information about this error also appears in the HIT/ME error log file. For example:
23-Sep-16 15:31:37.843|VSS|2016|8040||INFO|CEqlVssProvider::OnLunEmpty|645|@@@@
IVssHardwareSnapshotProvider::OnLunEmpty, DebugFlag 0x8 @@@@
23-Sep-16 15:31:37.843|VSS|2016|8040||INFO|CEqlVssProvider::OnLunEmpty|645|Logging Out
from targetName \\?\mpio#disk&ven_eqlogic&prod_100e-00&rev_8.0_#....
23-Sep-16 15:32:07.421|VSS|2016|8040||ERROR|CEqlVssProvider::OnLunEmpty|672|Error
0xEFFF0040 logging out from \\?\mpio#disk&ven_eqlogic&prod_100e-00&rev_8.0_#....
Because this error does not impact the functionality of the storage system, regard the
Requested target not found error as informational only. No further action is required.
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