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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 .
Configuring High Availability
The Cisco MDS 9500 Series of multilayer directors support application restartability and nondisruptive
supervisor switchability. The switches are protected from system failure by redundant hardware
components and a high availability software framework.
This chapter includes the following sections:
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About High Availability
The high availability (HA) software framework provides the following:
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OL-6973-03, Cisco MDS SAN-OS Release 2.x
About High Availability, page 8-1
Switchover Mechanisms, page 8-2
Switchover Guidelines, page 8-3
Process Restartability, page 8-4
Synchronizing Supervisor Modules, page 8-4
Copying Boot Variable Images to the Standby Supervisor, page 8-4
Displaying HA Information, page 8-5
Ensures nondisruptive software upgrade capability. See
Provides redundancy for supervisor module failure by using dual supervisor modules.
Performs nondisruptive restarts of a failed process on the same supervisor module. A service
running on the supervisor modules and on the switching module tracks the HA policy defined in the
configuration and takes action based on this policy. This feature is also available in switches in the
Cisco MDS 9100 Series and the Cisco MDS 9200 Series.
Protects against link failure using the PortChannel (port aggregation) feature. This feature is also
available in switches in the Cisco MDS 9200 Series and in the Cisco MDS 9100 Series. See
Chapter 13, "Configuring PortChannels."
C H A P T E R
Chapter 6, "Software Images."
Cisco MDS 9000 Family Configuration Guide
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8-1
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