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

2-68 Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide
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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
Table 2-9 identifies possible I/O path failure events in redundant FC-ALs for
active/active configurations with two or more RA4000/RA4100 Arrays and
the failover response, if any, implemented by Secure Path for each failure.
Table 2-9
I/O Path Failure and Failover Scenarios in Redundant FC-ALs for Active/Active
Configurations With Two or More RA4000/RA4100 Arrays
Description of Failure Failover Response
The active array controller in one
RA4000/RA4100 Array fails.
Secure Path makes the standby array controller in the
RA4000/RA4100 Array active and reroutes I/O activity to that array
controller. The Storage Hub or FC-AL Switch that is connected to
the new active array controller becomes the active I/O path to this
RA4000/RA4100 Array. In each node, I/O activity between the Fibre
Host Adapter that is connected to the failed array controller is
rerouted to the second Fibre Host Adapter in the pair, but only along
the I/O path to the affected RA4000/RA4100 Array. The first Fibre
Host Adapter in each node continues to be the active I/O path for
active array controllers in other RA4000/RA4100 Arrays to which it
is connected.
The standby array controller in one
RA4000/RA4100 Array fails.
None
The Fibre Channel cable
connection between the active
array controller in one
RA4000/RA4100 Array and its
Storage Hub or FC-AL Switch is
broken.
Secure Path makes the active array controller to which the failed
cable is connected inactive. The standby array controller in the
RA4000/RA4100 Array becomes active. I/O activity is routed
through the Fibre Channel cable installed to the new active array
controller and the other Storage Hub or FC-AL Switch. In each
node, I/O activity between the Fibre Host Adapter that is connected
to the failed array controller is rerouted to the second Fibre Host
Adapter in the pair, but only along the I/O path to the affected
RA4000/RA4100 Array. The first Fibre Host Adapter in each node
continues to be the active I/O path for active array controllers in
other RA4000/RA4100 Arrays to which it is connected.
The Fibre Channel cable
connection between the standby
array controller in one
RA4000/RA4100 Array and its
Storage Hub or FC-AL Switch is
broken.
None
continued