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

2-16 Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide
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: c-ch2 Cluster Architecture.doc Last Saved On: 6/13/01 10:21 AM
In every redundant Fibre Channel Fabric, at least two Fibre Host Adapters
must be installed in each node (one adapter for each Fibre Channel SAN
Switch in that redundant Fibre Channel Fabric).
In the active/standby configuration, only one of the two Fibre Host Adapters in
each node is active at any one time; the other Fibre Host Adapter is in the
standby state. The active Fibre Host Adapter is connected to the first Fibre
Channel SAN Switch, which is connected to the active array controller in each
RA4000/RA4100 Array. The standby Fibre Host Adapter is connected to the
second Fibre Channel SAN Switch, which is connected to the standby array
controller in each RA4000/RA4100 Array. The standby Fibre Host Adapter
remains in the standby state unless a failover from the active I/O path occurs.
In the active/standby configuration, the failure of any component along an
active I/O path (Fibre Host Adapter, Fibre Channel SAN Switch, active array
controller, or Fibre Channel cable) causes Secure Path to implement a
complete failover to the components on the standby I/O path.
In the active/active configuration, both Fibre Host Adapters in each node are
simultaneously active. Both are active because each Fibre Host Adapter is
connected to a Fibre Channel SAN Switch that, in turn, is connected to an
active array controller in each RA4000/RA4100 Array. Because each Fibre
Host Adapter and Fibre Channel SAN Switch must connect to at least one
active array controller, at least two RA4000/RA4100 Arrays must be present
in an active/active configuration.
See “Active/Standby Configuration Examples for Redundant Fibre Channel
Fabrics” in this chapter for a detailed description of active/standby
configuration examples with from one to five RA4000/RA4100 Arrays. See
“Active/Active Configuration Examples for Redundant Fibre Channel
Fabrics” for a detailed description of active/active configuration examples
when two to five RA4000/RA4100 Arrays are present.