Upgrading High-Availability Data Replication (HDR) Pair

Resolving The Problem

To upgrade High-Availability Data Replication (HDR) database server pair, you need to do the following steps:

1. Switch the primary database server to standard mode by running the following command:


onmode -d standard


Note: Switching the primary to standard mode is not necessary. But, doing that will bring the primary online faster after the upgrade, because it will not try to connect to the secondary database server.


2. Shutdown both database servers by running the following command:


onmode -ky


3. Upgrade the primary database server.

Refer to the IBM Informix Migration Guide Unix, Linux and Windows for more details.


4. Take a level 0 archive for the primary database server by using one of the following archive methods:


ontape -s -L 0  OR  onbar -b -L 0


5. Set the type of the primary database server to primary and indicate the associated secondary database server using the following onmode command:


onmode -d primary sec_name

sec_name
The name of the secondary database server.


6. Upgrade the secondary database server.


7. Bring the secondary database server online using physical restore by using on of the following commands:


ontape -p OR onbar -r -p

The following table shows the steps to be done for upgrading the servers in a HDR pair where ServerA is primary and ServerB is secondary.



ServerA	ServerB
1.  onmode -d standard	2.  onmode -ky
3.  onmode -ky
4.  Upgrade 5.  oninit 6.  ontape -s 7.  onmode -d primary ServerB
	8.  Upgrade 9.  ontape -p