Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide

Cluster Planning 4-15
Compaq Confidential – Need to Know Required
Writer: John Blackburn Project: Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide Comments:
Part Number: 225082-002 File Name: e-ch4 Cluster Planning.doc Last Saved On: 6/13/01 10:25 AM
In a PDC/O2000 cluster, each node is connected to shared storage disk drives
housed in RA4000/RA4100 Arrays. When planning the amount of shared
storage for your cluster, you must consider the following:
■ The maximum allowable number of shared storage arrays in one cluster.
This maximum depends on several factors, including limits on the
number of RA4000/RA4100 Arrays you can install in each redundant
Fibre Channel Fabric or redundant FC-AL and how many redundant
Fibre Channel Fabrics or redundant FC-ALs you plan to install in the
cluster.
■ The number of redundant Fibre Channel Fabrics or redundant FC-ALs
allowed in a cluster, in turn, depends upon the maximum number of
Fibre Host Adapters that can be installed in the ProLiant server model
you will be using. Refer to the server documentation for this
information.
■ The appropriate number of shared storage arrays in a cluster is
determined by the performance requirements of your cluster.
Refer to “Planning Shared Storage Components for Redundant Fibre Channel
Fabrics” and “Planning Shared Storage Components for Redundant Fibre
Channel Arbitrated Loops” in this chapter for more information.
The PDC/O2000 implements RAID at the hardware level, which is faster than
software RAID. When you implement RAID on shared storage arrays, you use
the hardware RAID to perform such functions as making copies of the data or
calculating checksums. Use the Compaq Array Configuration Utility to
implement RAID on your logical disks.
NOTE: Do not use the software RAID offered by the operating system to configure your
shared storage disks.