Fibre Channel San Switch - Compaq 112726-001 - ProLiant - 6500 Administrator's Manual

it would to any SCSI device. An array controller port receives the I/O requests
from a host adapter in a cluster node and directs them to the shared storage
disks to which it has been configured.
Because the array controller processes the I/O requests, the cluster nodes are
not burdened with the I/O processing tasks associated with reading and writing
data to multiple shared storage devices.
Each HSG80 Array Controller port combines all of the logical disk drives that
have been configured to it into a single, high-performance storage unit called a
storageset. RAID technology ensures that every unpartitioned storageset,
whether it uses 12 disks or 14 disks, looks like a single storage unit to the
cluster nodes.
Both ports on each of the two HSG80 Array Controllers in the controller
enclosure are simultaneously active, and access to a specific logical unit
number (LUN) is distributed among and shared by these ports. This provides
redundant access to the same LUNs if one port or array controller fails. If an
HSG80 Array Controller in an MA8000/EMA12000 Storage Subsystem fails,
Secure Path failover software detects the failure and automatically transfers all
I/O activity to the defined backup path.
To further ensure redundancy, connect the two ports on each HSG80 Array
Controller by Fibre Channel cables to different Fibre Channel SAN Switches
or Storage Hubs.
For further information, refer to the Compaq StorageWorks documentation
provided with the array controllers.

Fibre Channel SAN Switch

IMPORTANT: For detailed information about cascading two Fibre Channel SAN Switches,
refer to the latest Compaq StorageWorks documentation. This guide does not document
cascaded configurations for the Fibre Channel SAN Switch.
Fibre Channel SAN Switches are installed between cluster nodes and shared
storage subsystems in clusters to create redundant Fibre Channel Fabrics.
An 8-port Fibre Channel SAN Switch and 16-port Fibre Channel SAN Switch
are supported. From two to four Fibre Channel SAN Switches can be used in
each redundant Fibre Channel Fabric.
Fibre Channel SAN Switches provide full 100 MBps bandwidth on every port.
Adding new devices to Fibre Channel SAN Switch ports increases the
aggregate bandwidth.
Cluster Architecture 2-5