Changing the sequence of backup nodes - assure_mimix - 10.0

Assure MIMIX Operations with PowerHA User Guide

Product type
Software
Portfolio
Integrate
Product family
Assure
Product
Assure MIMIX™ Software
Version
10.0
Language
English
Product name
Assure MIMIX
Title
Assure MIMIX Operations with PowerHA User Guide
Topic type
How Do I
Copyright
2023
First publish date
2009

Use this procedure if you need to change the sequence of the current backup nodes. This procedure may change the configured sequence for multiple nodes so that you can achieve the desired sequence for backup nodes. The changes are not effective until Step 5 is performed.

Do the following from an active application group:

  1. From the Work with Application Groups display, type 12 (Node entries) next to the application group you want and press Enter.

  2. The Work with Node Entries display appears. Using F10 to toggle between configuration view and status views, confirm that the node with the configured role of *PRIMARY is the same node that is shown as the current *PRIMARY role.  

    • If the same node is identified as *PRIMARY for the current role and the configured role, skip to Step 4.

    • If the configured *PRIMARY node does not match the current *PRIMARY node, perform Step 3 to correct this situation before making any changes to the configured sequence of backup nodes.

    Figure 2 is an example of how configuration information appears on the Work with Node Entries display.

  3. Perform this step only if you need to correct the configured primary node to match the current primary node. This step will demote the configured primary node to a backup, then promote the correct node to become the configured primary node. Do the following:

    1. From the configuration view of the Work with Node Entries display, type 2 (Change) next to the configured primary node and press Enter.

    2. On the Change Node Entry (CHGNODE) display, specify *BACKUP for Role and press Enter. Then specify *FIRST for List position and press Enter.

    3. On the Work with Node Entries display, press F5 (Refresh) to view changes. All nodes in the configured view should have *BACKUP roles.

    4. If necessary toggle to the status view to confirm which node is the current primary node. Type 2 (Change) next to the current primary node and press Enter.

    5. On the Change Node Entry (CHGNODE) display, specify *PRIMARY for Role and press Enter. Then press Enter two more times.

    6. On the Work with Node Entries display, press F5 (Refresh)  to view changes. You should see the correct node as the configured primary node.

      Note: The numbering for the backup sequence may not update; however, the relative order for the configured backup sequence remains unchanged. Gaps in configured sequence numbers are ignored when switching to a backup. As long as the relative order is correct, it is not necessary to change the configured sequence of backup nodes just to remove gaps in numbering.
    7. If the configured backup sequence is what you expect, skip to Step 5 to make the change effective.

  4.  To change the sequence of backup nodes, do the following:

    1. From the configured view of the Work with Node Entries display, type 2 (Change) next to the backup node whose sequence you want to change.

    2. On the Change Node Entry (CHGNODE) display, specify *BACKUP for Role and press Enter. Then specify either *FIRST or a number for List position and press Enter.

      Note: If you specify a number, it cannot already be used in the configured sequence list.
    3. On the Work with Node Entries display, press F5 (Refresh) to view changes.

    4. Repeat Step 4 until the correct sequence is shown on the configuration view.

      Note: Gaps in configured sequence numbers are ignored when switching to a backup. For example, in a configuration with two backup nodes, there is no operational difference between a backup sequence of 1, 2 and a backup sequence of 2, 5 as long as the same nodes are specified in the same relative order.
  5. To make the changes to the backup order effective, do the following:

    1. Press F12 (Cancel) to return to the Work with Application Groups display.

    2. Type 9 (Start) next to the application group you want and press F4 (Prompt).

    3. On the Start Application Group (STRAG) display, specify *CONFIG for Current node roles and press Enter.

    4. The Procedure prompt appears. If needed, specify a different value and then press Enter.

  6. Confirm that the node entries have changed. Type 12 (Node entries) next to the application group and press Enter. If necessary, use F10 to access the status view. The current backup nodes should be in the new order.

    Figure 2. Example of displaying the configured sequence information for backup nodes: