Host-Based Mirroring Failure Types And Responses - Novell BUSINESS CONTINUITY CLUSTERING 1.1 SP1 - 9-21-2010 ADMINISTRATION GUIDE FOR OPEN ENTERPRISE SERVER 1 SP2 LINUX Administration Manual

Primary SAN Fails but Primary Cluster Does Not
When the primary SAN fails, the primary cluster also fails. Bring the primary SAN back up and
follow your SAN vendor's instructions to remirror and, if necessary, promote the former primary
SAN back to primary. You might need to demote the LUNs and resources to secondary on the
primary SAN before bringing them back up. You can use the
command to change resource states to offline and secondary. Bring up the former primary cluster
servers and fail back the resources.
Secondary SAN Fails but Secondary Cluster Does Not
When the secondary SAN fails, the secondary cluster also fails. Bring the secondary SAN back up
and follow your SAN vendor's instructions to remirror. Then bring the secondary cluster back up.
When you bring the secondary SAN and cluster back up, resources are still in a secondary state.
Intersite SAN Connectivity Is Lost
Recover your SANs first, then remirror from the good side to the bad side.
Intersite LAN Connectivity Is Lost
Users might not be able to access servers in the primary cluster but can possibly access servers in the
secondary cluster. If both clusters are up, nothing additional is required. An error is displayed. Wait
for connectivity to resume.
If you have configured the auto-failover feature, see
page 85.

2.6.2 Host-based Mirroring Failure Types and Responses

Host-based mirroring failure types and responses are described in the following sections:

"Primary Cluster Fails but Primary SAN Does Not" on page 56

"Primary Cluster and Primary SAN Both Fail" on page 57

"Secondary Cluster Fails but Secondary SAN Does Not" on page 57

"Secondary Cluster and Secondary SAN Both Fail" on page 57

"Primary SAN Fails but Primary Cluster Does Not" on page 57

"Secondary SAN Fails but Secondary Cluster Does Not" on page 57

"Intersite SAN Connectivity is Lost" on page 57

"Intersite LAN Connectivity is Lost" on page 57
Primary Cluster Fails but Primary SAN Does Not
Response for this failure is the same as for SAN-based mirroring described in
but Primary SAN Does Not
on page 55. Do not disable MSAP (Multiple Server Activation Prevention), which is enabled by
default.
56 Novell Business Continuity Clustering 1.1 Administration Guide for Linux
Appendix B, "Setting Up Auto-Failover," on
in Section 2.6.1, "SAN-Based Mirroring Failure Types and Responses,"
cluster resetresources
Primary Cluster Fails
console