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High Availability (HA)
Feature Description
10
Replacing HA Units
When replacing HA units it is important to follow the correct steps in sequence to ensure that
there is little or no downtime for end users. The below example has two old units which are to
be replaced with two new units.
The steps below are written assuming that the new units are powered on and available to be
provisioned and that all cabling is in place.
Old unit 1 (A) (Master)
No preferred master set
Replacement units:
Old unit 2 (B) (Standby)
New unit 1 (C)
New unit 2 (D)
Update the firmware on the old units if possible. For further information on how to upgrade the
firmware of a HA pair, refer to
Section
6
and the 0
Software Migration - Version 6 to 7, Technical
Note
document.
1.
On the WUI of the individual unit being replaced, in the main menu, go to
Local
Administration > Backup/Restore
.
Figure 10-1: Create a Backup
2.
Click
Create Backup File
.
3.
Save the backup file.
4.
In the WUI of unit 1 (A), in the main menu, go to
System Configuration > Miscellaneous
Options > HA Parameters
.
Figure 10-2: Perfer First HA
5.
Select
Prefer First HA
in the
Switch to Preferred Server
drop-down list.
Specifying a preferred host means that when the machine restarts, the
preferred unit always becomes master and the partner will revert to slave
mode. This may cause connection loss.
