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.
This feature is available only if the client operates as a data
mover for IBM Storage Protect for Virtual Environments: Data Protection for VMware.
Procedure
- Examine the ESX server Task and Event log for an All Paths
Down (APD) error.
It can take time for this error to display
in the logs, but it must be present before you continue to the next
steps. If you do not wait for the error before you attempt more troubleshooting,
you might bring the ESX server down.
- Power off
the virtual machine.
- Rescan the HBA.
Rescanning the HBA on the ESX
server might reactivate the failed device. If VMware kernel locks
prevent you from rescanning the HBA, perform the following steps:
- In the vCenter interface, select the ESX host.
- Click Configuration.
- Right click iSCSI Software Adapter and
select Properties.
- Click Static Discovery.
- Delete any static addresses and click Close.
- Rescan the HBA.
