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these distances can be increased to 10 kilometers (and a total of 25 kilometers on the Fibre
Channel loop).
NOTE: The maximum distance between a single server and the Fibre Channel Storage Hub is 10
kilometers. A NetWare connection or dedicated direct link will need to connect each cluster node.
Connecting the nodes over long distances will require a combined use of Ethernet network devices, such as
hubs, switches, or repeaters.
The Compaq RAID Array 4000 storage system consists of four primary components:
•
Fibre Channel Array
•
Fibre Channel Storage Hub
•
Fibre Channel Array Controller
•
Fibre Channel Host Controller
When planning your Compaq RAID Array 4000 storage system, remember to include any
necessary cabling. Also, the Fibre Channel Array Controller is not a separate component; rather,
the array controller is an integral part of the Fibre Channel Array.
Compaq Fibre Channel Array
The Compaq Fibre Channel Array is the storage chassis that contains the disk drives, power
supply, and Fibre Channel Array Controller. The Fibre Channel Array can hold twelve 1-inch or
eight 1.6-inch Wide-Ultra SCSI-3 drives. The Compaq Fibre Channel Array comes in both a rack
and a tower model.
Each ProLiant Cluster for NetWare 4.2 must have at least one Compaq RAID Array 4000 storage
system as external shared storage. As many as five Compaq RA4000s can be attached to the Fibre
Channel Storage Hub 7 and, with the Fibre Channel Storage Hub 12, up to ten Compaq RA4000s
are supported. In both cases, two ports on the hubs are used by the server connections. With the
Compaq RA4000 connected to both servers through the Fibre Channel Storage Hub, you can
independently manage volumes on the servers in the cluster as needed by your application and
environment.
Compaq Fibre Channel Storage Hub
The Fibre Channel Storage Hub creates the data path that allows one or more Compaq RAID
Array 4000 storage systems to communicate with one or more ProLiant servers. The Compaq
ProLiant Cluster for NetWare 4.2 requires at least one Fibre Channel Storage Hub; both servers
and all shared storage for the cluster must connect to this hub.
As the names imply, the Fibre Channel Storage Hub 7 and the Fibre Channel Storage Hub 12
contain seven and twelve ports, respectively. As mentioned, using the hubs in a cluster
environment will consume two ports for server connections, allowing five Compaq RAID Array
4000 storage systems on the Fibre Channel Storage Hub 7 and 10 arrays on the Fibre Channel
Storage Hub 12.
For higher availability, two Fibre Channel Storage Hubs can be configured as a redundant pair.
When used in combination with redundant Fibre Channel Array Controllers and redundant Fibre
Channel Host Controllers, a complete backup data path can be configured between the cluster
servers and the Compaq RAID Array 4000, as described below under “Redundant Fibre Channel
Loop for Increased Availability.”
