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Cisco MDS 9000 Fabric Manager Switch Configuration Guide
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Configuring High Availability
This chapter provides details on the high availability feature that is available on switches with two
supervisor modules.
This chapter contains the following topics:
•
About High Availability, page 7-1
•
Switchover Mechanisms, page 7-2
•
Process Restartability, page 7-2
•
Synchronizing Supervisor Modules, page 7-2
•
HA Redundancy States, page 7-2
About 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. The high availability (HA) software framework
provides for the following:
•
Ensures nondisruptive software upgrade capability.
•
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 Cisco MDS 9216
switches and in the Cisco MDS 9100 Series.
•
Protects against link failure using the PortChannel (port aggregation) feature. This feature is also
available in Cisco MDS 9216 switches and in the Cisco MDS 9100 Series.
•
Provides management redundancy using Virtual Router Redundancy Protocol (VRRP). This feature
is also available in Cisco MDS 9216 switches and in the Cisco MDS 9100 Series.
•
Switchability--When the active supervisor fails, the standby supervisor, if present, takes over
without disrupting storage or host traffic.
Directors in the Cisco MDS 9500 Series have two supervisor modules in the two center slots (sup-1 and
sup-2). When the switch powers up and both supervisor modules are present, the supervisor module that
comes up first enters the active mode and the supervisor module that comes up second enters the standby
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