Adding PowerHA SystemMirror site definitions

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You can define sites in PowerHA® SystemMirror® Standard Edition or PowerHA SystemMirror Enterprise Edition. You must define sites to enable PowerHA SystemMirror Enterprise Edition storage replication support, including Geographic Logical Volume Manager (GLVM) and Metro Mirror.

Before you begin

When you associate nodes and storage devices with a site, you can use PowerHA SystemMirror to help implement a split-site LVM mirroring configuration. PowerHA SystemMirror identifies appropriate selections that are based on site information and verifies the consistency of the mirroring configuration at a site level.

Before you add a site definition, you must decide whether you want to use a stretched cluster or a linked cluster.

A linked cluster contains nodes from sites that are located at different geographical locations. Linked clusters do not require sites to share a repository disk or support multicast communication.

A stretched cluster contains nodes from sites that are located at the same geographical locations. Stretched clusters share at least one repository disk between sites.

About this task

If you define sites to be used in some other way, appropriate methods or customization must be provided to handle site operations. If sites are defined, site events run during node_up and node_down events.

If you are configuring sites, two sites must be configured and all nodes must belong to one of the two sites.

To add a site definition to a PowerHA SystemMirror cluster, complete the following steps:

Procedure

  1. From the command line, enter smit sysmirror
  2. From the SMIT interface, select Cluster Nodes and Network > Manage Sites > Add a Site, and press Enter.
  3. Complete the following fields.
    Table 1. Adding site fields

    Adding site fields.
    Field Description
    Site Name Enter a name for this site. The site name can be up to 64 alphanumeric characters.
    Site Nodes Press F4 (List) to select the available nodes that you want to be part of the site.
    Cluster Type Press F4 (List) to select stretched cluster or linked cluster.
  4. Press enter to add the site definition to PowerHA SystemMirror.
  5. Repeat the steps 1 - 4 to add definitions for the second site.