HP StorageWorks HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide (AA-RV1RA-TE, March 2005)

FC Configuration Procedures
159HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide
Note: This chapter does not attempt to answer questions of loading or performance.
Storage
The term Storage, as used in this chapter, is a RAID Array that is supported by the
HSG80 controller. This controller supports all of the standard RAID set
configurations in a loop or fabric environment. These configuration elements are
discussed in the following sections.
Active-Passive vs. Active-Active Controller Pairs
In dual controller systems, most controller pairs are configured for redundancy,
which means that the controllers are bound together in a such a way that if one
controller fails, the second controller will automatically service the I/O stream,
protecting data integrity. Typically, this redundancy is created for failover
protection. Failover can be implemented as either Active-Passive or
Active-Active.
In Case 1(shown in Table 15), all I/O is loaded on a single controller, Controller
A. In the event of a failure, the passive channel would handle the I/O from the
failed controller. Having the load on a single controller is a drawback to the
processing power of the controller pair.
Table 15: Case 1: Active-Passive (Describes the controller pair)
Channel 1 - Active Channel 2 - Active Controller A Primary Ch 1,
Primary Ch 2
Channel 1 -
Passive
Channel 2 -
Passive
Controller B Standby Ch 1,
Standby Ch 2