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High Availability (HA)
Feature Description
Table of Contents
1
Introduction .................................................................................................................................... 6
1.1
Intended Audience .................................................................................................................. 6
2
Advantages of High Availability (HA) .............................................................................................. 7
3
Prerequisites ................................................................................................................................... 8
4
HA Components .............................................................................................................................. 9
5
Setting Up HA ................................................................................................................................ 10
5.1
Set up the First Unit .............................................................................................................. 10
5.2
Set Up the Second Unit ......................................................................................................... 12
5.3
Enable the “Use for HA Checks” Option ............................................................................... 15
5.4
Test Failover .......................................................................................................................... 15
6
How to Perform a Firmware Update on HA Pairs ......................................................................... 17
7
HA Disaster Recovery Process (Replacing a Defective Unit) ......................................................... 18
7.1
Prerequisites ......................................................................................................................... 18
7.2
Installation ............................................................................................................................ 18
7.2.1
Reboot the Active Unit .................................................................................................. 19
7.2.2
Change the Switch to Preferred Server Option ............................................................ 20
8
HA WUI Options ............................................................................................................................ 21
8.1.1
Interfaces ...................................................................................................................... 21
8.1.2
HA Parameters .............................................................................................................. 22
9
Troubleshooting ............................................................................................................................ 26
9.1
General Troubleshooting Tips ............................................................................................... 26
9.2
No HA Status Squares are Visible in the WUI ....................................................................... 26
9.3
Green/Red HA Status Squares .............................................................................................. 26
9.4
Blue HA Status Square .......................................................................................................... 27
9.5
Both Units are Active and the WUI is Unresponsive – Blue or Red Status Square ............... 27
9.6
Grey HA Status Square .......................................................................................................... 27
9.7
Virtual Services Temporarily Unavailable After Failover ...................................................... 27
9.8
No Access to WUI on HA1/2 or Shared ................................................................................. 28
9.9
Nothing Works ...................................................................................................................... 28
9.10 Issue with Hyper-V and HA on a Pair of VLMs ...................................................................... 28
