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Home > Archive > WebSphere Edge Server > April 2004 > Edge Mutual HA
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| Corbyd 2004-04-23, 12:33 pm |
| I'm having issues trying to configure two Dispatcher machines for
Mutual HA. First, the machines are on different subnets. There's a
blurb buried in the docs about this not being supported for HA. Is
that true? If so, that's all I need to know. If not, I would like to
figure out why I'm seeing 'Not Synchronized' and 'Active' for all
roles and all clusters on one machine and 'Sync-In' and 'Stand-By' for
the other machine. When I ping the machine with 'Stand-By' status
from the Active machine it times-out. I'm at release 5.1 on Linux 8
with Kernel 2.4.19. Any help is greatly appreciated.
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| Harley Stenzel 2004-04-26, 9:33 am |
| Corbyd wrote:
> I'm having issues trying to configure two Dispatcher machines for
> Mutual HA. First, the machines are on different subnets. There's a
> blurb buried in the docs about this not being supported for HA. Is
> that true? If so, that's all I need to know.
It is absolutely true. The reason that the HA partners must be on the
same subnet is that if they are not, the takeover mechanism will not
work because routing trumps arp.
Load Balancer does not update routing tables; it relies on a combination
of arp and system configuration to move an IP address from the Active
Load Balancer to the Standby Load Balancer. Since the IP address that
they are moving is tied to a single subnet, both Load Balancers must be
on the same subnet. Therefore, the HA Partners must be on the same subnet.
--Harley
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