Problems with iSCSI devices can prevent you from performing
an instant access or instant restore operation.
About this task
When an ESX server cannot access a datastore on an iSCSI
disk, a VMware message is issued to indicate that a "permanent device
loss" error occurred. You should be offered an option to either cancel
or retry the iSCSI connection attempt. Choose the option to try the
operation again to see whether the error is transient and if recovery
is possible. If the retry is not successful, try the following troubleshooting
steps. If they are successful, then try the instant restore or instant
access operation again.