esx.problem.storage.iscsi.target.permanently.lost
Summary
iSCSI target is no longer presented to the host.
Causes
iSCSI target that is used as a storage device is unmapped or is unavailable by the storage system.
Resolutions
For information on troubleshooting steps, see this VMware KB article.
External
Refer to the VMware Online Documentation for more information on vCenter event messages and possible solutions.