The network was all down during the HA active/standby switchover

[xiemb]

At the beginning, CP_B is the active and CP_A is the backup, after executing clusterXL_admin down,clusterXL_admin up on CP_B, the clients to access the server's business are all disconnected, and then executing clusterXL_admin down,clusterXL_admin up on CP_A, the clients to access the server's business are also disconnected. admin up on CP_A, the client to access the server is also disconnected. After looking at the messages, the status of HA is normal in both switchovers and there is also traffic to the firewall.
The topology diagram is as below:

[G_W_Albrecht]

That is possible for services that are not synchronized on the cluster. If connections are not set to keep data or rematch they will be disconnected. To check and synchronize a service, double click it => Advanced => Sync on cluster.

[xiemb]

Sync on cluster is on, I see traffic logs coming through the firewall, but noticed that new and concurrent connections are more than 3-4 times more than usual when switching over

[Lesley]

The increased amount of connections reflect the high load on both members.

Would further investigate the issue related to system load.

High load could impact cluster functionality. 

[G_W_Albrecht]

You can decide for every service if and how to sync between cluster nodes.

[the_rock]

I would definitely open TAC case to investigate this further. Just generate cpinfo files, as well as /var/log/messages*

Andy

[xiemb]

Thanks for your reply! I have exported the cpinf file the day after the failure. However, I see on the messages file that the firewall status is normal after switching active and standby twice.

[the_rock]

Is clustering working right?

Please send below:

cphaprob state

cphaprob -a if

cphaprob roles

cphaprob -i list

cphaprob -l list

cphaprob syncstat

Andy

[AmirArama]

Maybe the network devices do not learn the ARP change of the VIP fast enough.

You can see if traffic still flowing on the GW after you run clusterXL_admin down

vmac might help if this is the case.