Are your clients outside the network where zen lb is? then maybe the
following is the reason:
When a cluster service switches (you can check if service switches it in
/var/log/messages & /var/log/syslog) the VIRTUAL IPS and farms are started
in the secondary node, and gratuitous arp packets are sent to the network
in order to indicate to switches and firewalls that the MAC of given IP[s]
have been modified. Some vendors additionaly to ARP gratuitous packets,
require to receive also many numbers of icmp packets.
Also happen with clients inside zen network?
This behaviour (to change the MAC for IPs) could be marked as switches
(physical and virtual) as MAC Spoofing, so ensure this is disabled for the
vlan where zen configures VIrtual IPs
For example in vmware vswitches "Forded transmission" should be configured
as Accept:
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.security.doc%2FGUID-7DC6486F-5400-44DF-8A62-6273798A2F80.html
2016-04-25 14:57 GMT+02:00 Scharfenberg, Carsten <
c.scharfenb...@francotyp.com>:
> Hello,
>
> I managed to get my load balancer farms up and running.
> Now I’m performing some tests:
>
> - A failure of a single farm node is not perceivable by the client –
> great J
> - A failure of the primary ZLB cluster node leads to a downtime of 10
> to 20 minutes until the secondary node takes over L
>
>
> So my question is: is this a normal recovery time or can it be optimized?
>
> Note: when I access my services from within the server network there is no
> perceivable downtime. But from my client network point of view there is
> this downtime.
> Obviously the overall network setup is important. So I include – once
> again – an image of this layout in my email.
>
> Thanks a lot in advance,
> C. Scharfenberg
>
>
>
>
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