SG - Multiple lans (no standby), one package

[Omar Alvi_1]

Hi,

I have 2 nodes on which I'm designing my Cluster with a dummy package for simple OS failover.

Each of the systems has 3 lan cards, each on a different subnet. The different lans are basically used for security. User to system, system to system, and admin to system communication. There are no standby Lan cards.

I have the following issues

1- Can I have an active LAN (which is relatively less important) configured as a standby / failover for another more important lan in case of failure

2- Since I don't have any standby lans, the default behaviour will be for the node to failover if any of the lan cards fails, right?

3- If the lan card fails, the application will still be up so I wouldn't like the application to failover, I can manually modify one of the other lans to take up the important tasks. How can I prevent failover in case of one subnet failure in my case?

4- Can I have multiple virtual IP addresses for a single application for each of the subnets?

Appreciate any assistance.

Thanks and regards,

-Alvi

[melvyn burnard]

1- Can I have an active LAN (which is relatively less important) configured as a standby / failover for another more important lan in case of failure

No, as the card needs to be unconfigured to act as a standby.



2- Since I don't have any standby lans, the default behaviour will be for the node to failover if any of the lan cards fails, right?

Not necessarily, it depends on how you configure your package(s) and monitored IP addresses.


3- If the lan card fails, the application will still be up so I wouldn't like the application to failover, I can manually modify one of the other lans to take up the important tasks. How can I prevent failover in case of one subnet failure in my case?

Have a floating IP address for each lan card per package in the control file, but do not set the subnet to be monitored in the package config file


4- Can I have multiple virtual IP addresses for a single application for each of the subnets?

Yes, but each virtual IP must be in the same subnet.

[Emil Velez]

If I can make a suggestion why not configure the admin to system and system to system lan card to be the same and then you will have 1 unused lan card. You can configure multiple subnets on a single card so that should not be a problem. 1 lan card can be a standby for multiple ones if it is bridged correctly.

The application will only failover if a lan card fails if the lan card is listed in the package configuration in the SUBNET parameter. That makes the package depenent on that subnet. You at least want the package dependindent on the heartbeat subnet but it does not have to be depenedent on the others. If you want the package to failover when any subnet fails then all of the subnets would be listed in the package configuration.

Yes you can have multiple multiple virtual IPS in a package

SUBNET[0]=156.153.205.0
IP[0]=156.153.205.45
SUBNET[1]=15.5.157.0
IP[1]=15.5.157.40

just increase the subscripts in the package run script. This allows a package to have multiple Virtual IPS. Each subnet and IP are pairs. Make sure you have the right subnet address depenent on your subnet mask.

Emil