Status Tab Menu Actions
Included in the Status tab are several menu actions used in volume recovery. These options are enabled by selecting the virtual volume in the upper right pane of the Status tab, then selecting the Volume ID in Logical Volumes tab, and then selecting the option from the context menu (unless otherwise noted).
Enable Client Access to this Volume - Use this option if both the primary and secondary volumes in the virtual volume are inaccessible (refer to the Logical Volumes tab). Performing this action marks the selected volume to be the last known good and allows the application server access to the volume. The administrator can decide which is the preferred side from which to access this volume.
Failback to Primary Path – Used in a situation where AP Volumes are running on their alternate path to force them to switch back to the primary path. (Enable this option from the context menu after selecting the virtual volume in the upper-right pane.)
Start Recovery Using this Volume as Healthy Base – Use this option when both the primary and secondary volumes of a virtual volume display the state “double failure.” The “double failure” state indicates that the mirrored virtual volume (primary and secondary data) is no longer in synchronization due to simultaneous failures. If this condition should occur, normal automatic mirror recoveries do not occur. This condition may result in a data loss and may be indicated on the application server as data inconsistency depending on the failure conditions that occurred.
You may recover from this state by either restoring the data from a backup on to a newly created virtual volume OR by using the Start Recovery Using this Volume as Healthy Base option. Using this option marks the selected volume to be the last known good. This allows the application server access to this volume and will allow the mirror to start recovery from this volume as the healthy base.
If you are using NMVs: Check the allocated storage size on the NMVs before making the decision as to which storage server to force up. Sometimes it is not simply the last storage server to go down. Sometimes the storage server with the most SAUs allocated indicates which side you should use as a healthy base.
Warning: Recovering from the incorrect side of the mirror pair may result in additional data loss, so check the application server logs to determine which mirror component (primary/secondary) was actively servicing I/O requests at the time the failure occurred. If you are unsure as how to proceed, contact DataCore Technical Support for assistance.
Switch Dual Path access to this Volume – This option is applicable to Dual Path volumes only and allows path access changes. Enable this option to force the path access from Read Only to Read/Write. (The partner path will change from Read/Write to Read Only.) See Changing Read/Write Access on DP Pools.