Legato Legato Networker, Recovery Manual

Page: 132 / 194

Legato NetWorker, Release 7.0
Disaster Recovery Guide
7
Recovering Multiple Cluster Nodes
132
Recovering Multiple Cluster Nodes
This section provides general guidelines for performing a cluster recovery in
case both cluster nodes fail. In this scenario, the operating system is unusable
on each node. Therefore, this recovery procedure includes reinstallation of
Windows on each node, as well as NetWorker recovery of the cluster database.
Important:
Because cluster configurations vary, it is not possible to provide
cluster disaster recovery procedures for every situation. Depending on the
particular cluster configuration and the nature of the failure, it might be
necessary to vary some of the procedures described in this section.
How to Recover Multiple Cluster Nodes
To perform a complete cluster recovery in the event that both cluster nodes,
Node_A and Node_B, have failed:
1. Ensure that the system disk of each node is configured using the same
partitioning scheme and drive letter that was in use prior to the loss of the
node.
Note: On each cluster node, the repaired or replaced system disk must
have the same partitioning scheme, disk format, and drive letter
configuration that was in use prior to the node failure. However, drive
letter assignments of available volumes during Windows setup may cause
the system disk drive letter to change. Therefore, prior to reinstalling the
Windows operating system, disconnect the SCSI bus if the shared drives
are being enumerated before the local drives.
2. Format and verify the system disk on each node.
3. On each node, reinstall Windows to the partition it occupied before the
node failure. During Windows setup on each node, verify that the domain
controller is available and that each potential node is able to join.
4. Delete the MSCS folder on the quorum disk.
5. On the quorum disk, run the chkdsk command.