Configuring High Availability; About High Availability - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

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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-17256-03, Cisco MDS NX-OS Release 4.x
About High Availability, page 17-1
Switchover Mechanisms, page 17-2
Switchover Guidelines, page 17-3
Process Restartability, page 17-3
Synchronizing Supervisor Modules, page 17-3
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 9200 Series and the Cisco MDS 9100 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 23, "Configuring PortChannels."
Provides management redundancy using the Virtual Router Redundancy Protocol (VRRP). This
feature is also available in switches in the Cisco MDS 9200 Series and in the Cisco MDS 9100
Series.
See the "Virtual Router Redundancy Protocol" section on page 51-8
Provides switchovers if 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 (sup-1 and sup-2) in slots 5
and 6 (Cisco MDS 9509 and 9506 Switches) or slots 7 and 8 (Cisco MDS 9513 Switch). 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 mode. If
C H A P T E R
Chapter 15, "Software Images."
Cisco MDS 9000 Family Fabric Manager Configuration Guide
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17-1