High Availability; Reliability - HP StorageWorks 2/64 - Core Switch Installation Manual

High availability

The following features contribute to the Core Switch 2/64 and SAN Director 2/128
high-availability design:
• Redundant, hot-swappable components
• Redundant power and cooling subsystems
• Enhanced data integrity on all data paths
• Fabric Shortest Path First (FSPF) rerouting around failed links
• Integration with SNMP managers
• Automatic control processor failover
• Nondisruptive hot software code loads and activation
• Easy configuration, save, and restore
The high-availability software architecture of the Core Switch 2/64 and the SAN
Director 2/128 provides a common framework for all applications that reside on the system,
allowing global and local states to be maintained enough to manage any component failure.
High-availability elements consist of the High Availability Manager, the heartbeat, the
fault/health framework, the replicated database, initialization, and software upgrade.
The High Availability Manager controls access to the standby control processor, facilitates
software upgrades, prevents extraneous switchover activity, closes and flushes streams as
needed, provides flow control and message buffering, and supports a centralized active and
standby state.

Reliability

The Core Switch 2/64 and the SAN Director 2/128 use the following error detection and
correction mechanisms to ensure the reliability of all data inside the chassis:
• Power-on self test (POST)
• Error Detection and Fault Isolation (EDFI), such as cyclic redundancy checking (CRC), parity
checking, checksum, and illegal address checking
18 Overview