Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Cascading Failover in a Continental Cluster

Data Storage Setup

Chapter 8 369

• The next three digits equal the Symmetrix host adapter (SA or

FA) and port numbers; this is useful to see multiple host links to

the same Symmetrix device (PVLinks).

6. The BCV devices are configured to be visible on a different SA/FA

than R1 or R2 devices. These devices will not show on the output of

the syminq command unless there is a host connection to this SA/FA

and the BCV’s are split from the mirror group. To get a list of these

devices, use the command:

# symdev list

7. Get a list of the disk devices known to the host system. Use the

following command, as appropriate:

# ioscan -kfnC disk

# ioscan -fnC disk

Match the device file names in this listing with the device file names

in the output from the syminq command to see which devices are

seen from this host to make sure that this host can see all necessary

devices.

8. There are three Symmetrix device groups needed for each

application package:

• One device group contains the R1 devices in the primary

Symmetrix plus its remote BCV devices in the secondary

Symmetrix. This device group has to be defined in all nodes that