Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/05000 for Ora - Page 78

Planning Shared Storage Components for Redundant Fibre Channel Arbitrated Loops

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4-4 Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide To determine which Fibre Channel SAN Switch model is appropriate for a redundant Fibre Channel Fabric in your cluster, you need to know the following: I Whether you are implementing dual redundancy or quad redundancy in the redundant Fibre Channel Fabric. Dual redundancy requires two host adapters per node and two Fibre Channel SAN Switches. Quad redundancy requires four host adapters per node and four Fibre Channel SAN Switches. I Total number of host adapters in all nodes I Total number of array controller ports in all of the storage subsystems in the redundant Fibre Channel Fabric You will need enough switch ports to accommodate the connections from the host adapters to the Fibre Channel SAN Switches and from the Fibre Channel SAN Switches to the array controllers. The number of storage subsystems and shared disk drives used in a redundant Fibre Channel Fabric PDC/O5000 depends on the amount of shared storage space required by the database, the hardware RAID levels used on the shared storage disks, and the number and storage capacity of disk drives installed in the enclosures. Refer to "Raw Data Storage and Database Size" in this chapter for more details. NOTE: For improved I/O performance and cluster integrity, as you increase the number of nodes in a PDC/O5000, you should also increase the aggregate bandwidth of the shared storage subsystem by adding more or higher-capacity disk drives. Planning Shared Storage Components for Redundant Fibre Channel Arbitrated Loops Several key components make up the shared storage subsystem for the PDC/O5000. Each redundant Fibre Channel Arbitrated Loop (FC-AL) in a PDC/O5000 uses the following hardware components: I Two or more host adapters in each node. I Two or more Compaq StorageWorks Fibre Channel Storage Hubs (Storage Hubs), each of which connects all of the cluster nodes to both array controllers in each storage subsystem.

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4-4
Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide
To determine which Fibre Channel SAN Switch model is appropriate for a
redundant Fibre Channel Fabric in your cluster, you need to know the
following:
■
Whether you are implementing dual redundancy or quad redundancy in
the redundant Fibre Channel Fabric. Dual redundancy requires two host
adapters per node and two Fibre Channel SAN Switches. Quad
redundancy requires four host adapters per node and four Fibre Channel
SAN Switches.
■
Total number of host adapters in all nodes
■
Total number of array controller ports in all of the storage subsystems in
the redundant Fibre Channel Fabric
You will need enough switch ports to accommodate the connections from the
host adapters to the Fibre Channel SAN Switches and from the Fibre Channel
SAN Switches to the array controllers.
The number of storage subsystems and shared disk drives used in a redundant
Fibre Channel Fabric PDC/O5000 depends on the amount of shared storage
space required by the database, the hardware RAID levels used on the shared
storage disks, and the number and storage capacity of disk drives installed in
the enclosures. Refer to “Raw Data Storage and Database Size” in this chapter
for more details.
NOTE:
For improved I/O performance and cluster integrity, as you increase the number of
nodes in a PDC/O5000, you should also increase the aggregate bandwidth of the shared
storage subsystem by adding more or higher-capacity disk drives.
Planning Shared Storage Components for
Redundant Fibre Channel Arbitrated Loops
Several key components make up the shared storage subsystem for the
PDC/O5000. Each redundant Fibre Channel Arbitrated Loop (FC-AL) in a
PDC/O5000 uses the following hardware components:
■
Two or more host adapters in each node.
■
Two or more Compaq StorageWorks Fibre Channel Storage Hubs
(Storage Hubs), each of which connects all of the cluster nodes to both
array controllers in each storage subsystem.