Setting the active quorum disk

You can assign one of the quorum disks to be the active quorum disk in the SAN Volume Controller Console. In a cluster partition, the active quorum disk is used first to establish a quorum. Selecting a disk as the active quorum disk is useful in split-site configurations. Setting the active quorum disk ensures that the most highly available quorum disk is used in normal processing.

The cluster automatically chooses three managed disks (MDisks) as quorum disk candidates. Each disk is assigned a number (either 0, 1, or 2) that is called a quorum index. The number identifies the MDisk as a quorum disk to the cluster. You can also assign one of the quorum disks to be the active quorum disk. If a tie-break situation occurs, the active quorum disk is used first to establish a quorum. If SAN connectivity is lost, the cluster can continue to operate. One half of the cluster obtains the active quorum disk, and continues to process transactions. The other half ceases to process transactions as part of the cluster, until SAN connectivity is restored.

Attention: MDisks that are associated with solid-state drives (SSDs) on SAN Volume Controller 2145-CF8 nodes cannot be used as quorum disks.

This task assumes that you have already launched the SAN Volume Controller Console. To set the active quorum disk, follow these steps:

In the portfolio, click Work with Managed Disks > Quorum Disks. The Viewing Quorum Disks panel is displayed.
Select the quorum disk that you want to set as the active quorum disk. From the task list, select Set a Quorum Disk. Click Go. The Setting Active Quorum Disk panel is displayed.
Confirm that the selected disk is the one that you want to make the active quorum disk by clicking Set Active Quorum Disk.