Appendix; Cluster Management And Recovery Scenarios; Cluster Quorum And Master Switch Election - Cisco MDS 9000 series Configuration Manual

S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

Cluster Management and Recovery Scenarios

This appendix includes information on cluster management and recovery procedures that are used when
one or more switches in a Cisco IOA cluster is offline or when you want to change the master switch
assignment from one switch to another switch.
The procedures in this appendix describe troubleshooting solutions that use the CLI.
Note
The Cisco IOA cluster configuration for an offline switch must be done using the CLI. Cisco IOA cluster
Note
configuration for an online switch can be done using Fabric Manager or the CLI.
This appendix includes the following sections;
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Cluster Quorum and Master Switch Election

This section describes the Cisco IOA cluster quorum and the process for electing the master switch in a
cluster.
Node ID
Every switch in a cluster has a node ID. Cisco IOA assigns a node ID to every new switch as it is added
to the cluster. The switch where the cluster is created is assigned the node ID of 1. This is the master
switch. When a new switch is added to the cluster, it is assigned the next available higher node ID. For
example, when a second switch is added to the cluster it gets the node ID of 2 and the third switch gets
the node ID of 3, and so on.
Cluster View
The cluster view is the set of switches that are part of the operational cluster.
OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Cluster Quorum and Master Switch Election, page B-1
In-Service Software Upgrade (ISSU) in a Two-Node Cluster, page B-4
Supported Topologies, page B-5
Cluster Recovery Scenarios, page B-5
A P P E N D I X
Cisco MDS 9000 Family I/O Accelerator Configuration Guide
B
B-1