Compaq Parallel Database Cluster Model PDC/O1000 for Oracle8i and Windows 2000 Administrator Guide

2-14 Compaq Parallel Database Cluster Model PDC/O1000 for Oracle8i and Windows 2000 Administrator Guide

Compaq Confidential – Need to Know Required

Writer: John Blackburn Project: Compaq Parallel Database Cluster Model PDC/O1000 for Oracle8i and Windows 2000 Administrator Guide

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Part Number: 225083-002 File Name: c-ch2 Cluster Architecture.doc Last Saved On: 6/11/01 11:20 AM

Fibre Host Adapter-to-Fibre Channel SAN Switch

Paths

Figure 2-5 highlights the I/O data paths that run between the Fibre Host

Adapter in each cluster node and the Fibre Channel SAN Switch. There is one

I/O path for each Fibre Host Adapter.

Client LAN

Fibre

Host Adapters

Fibre

Host Adapters

ProLiant

Servers

RA4000/4100 Array

Fibre Channel

SAN Switch

Switch

(Cluster Interconnect)

ProLiant

Servers

Figure 2-5. Fibre Host Adapter-to-Fibre Channel SAN Switch I/O data paths

If one of these connections experiences a fault, the connections from the other

nodes ensure continued access to the database. The fault results in the eviction

of the cluster node with the failed connection. All network clients accessing

the database through that node must reconnect through another cluster node.

The effect of this failure is relatively minor. It affects only those users who are

connected to the database through the affected node. The duration of

downtime includes the time to detect the failure, the time to reconfigure from

the failure, and the time required for the network clients to reconnect to the

database through another node.

Note that Compaq Insight Manager

monitors the health of each

RA4000/RA4100 Array. If any part of the I/O data path disrupts a node’s

access to an RA4000/RA4100 Array, the status of the array controller in that

RA4000/RA4100 Array changes to “Failed” and the condition is red. The red

condition is reported to higher-level Insight Manager screens, and eventually

to the device list. Refer to the Compaq Insight Manager Guide for details.