Fujitsu IRF-1D series, User Manual

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Chapter 2 - Topologies and Operating Modes
Duplex Mode
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Duplex Mode
The duplex operating mode is a dual RAID controller solution providing a
redundant controller or an active-active RAID storage solution. Beginning with a
minimum level redundancy solution it can be configured to provide the most
robust redundant RAID storage solution. This operating mode supports the
Multiple Port Mirrored topology.
In a Multi-Port topology, all ports are active and provide transparent hardware
failover and failback operations. It provides for higher host bandwidth
capabilities with each port connected to an individual fibre loop.
During controller failure, internal HUB circuitry on the Host I/O cards
automatically detect a failure and connects the incoming Fibre loops together so
that the surviving controller immediately starts processing host commands.
There are essentially five supported topologies available for the Duplex mode:
■
“Multi-Port Mirrored Single Host-Single Connection” on page 27.
■
“Multi-Port Mirrored Single Host-Dual Connection” on page 28.
■
“Multi-Port Mirrored Dual Host System-Quad Connection” on page 31.
■
“Multi-Port Mirrored SAN Attach Single Switch Connection” on page 32.
■
“Multi-Port Mirrored SAN Attach Dual Switch Connection” on page 33.
NOTE:
Some Operating Systems, such as HP-UX, when connected to a fabric
require that you set the Controller Parameter option “Host Different
Node Name” to enabled. This will cause the controller to present a
different Configuration WWN for each controller port. Otherwise if the
same WWN is reported on both ports, one port would be blocked by the
OS. Refer to the VT-100 or StorView Software Guide for specific
information on this option.
imageRAID.book Page 26 Tuesday, September 23, 2003 4:08 PM