Support Forum
The Forums are a place to find answers on a range of Fortinet products from peers and product experts.
Lucas_Piris
New Contributor

HA with load balance all retransmission

Hi,

 

We have a Fortigate HA with load balance all enabled, and we are monitoring the behavior, and I can see many retransmissions between slave and master, just when the slave unit process the packet, see this picture:

 

Anyone known if this is normal? when we have load balance all enabled?

  

Regars

Lucas

 

12 REPLIES 12
vjoshi_FTNT
Staff
Staff

Hello Lucas,

 

Yes, it is possible if the traffic is high. load-balance-all option will make the primary unit load balance all TCP sessions.

It really doesn't help to improve the throughput because of extra overhead required for load balancing. So load-balance-all is disabled by default.

 

 

Lucas_Piris

Hi vjoshi,

 

Thanks.

 

The strange thing is that this environment is lab, has no charge. :(

 

Regards

Lucas

 

vjoshi wrote:

Hello Lucas,

 

Yes, it is possible if the traffic is high. load-balance-all option will make the primary unit load balance all TCP sessions.

It really doesn't help to improve the throughput because of extra overhead required for load balancing. So load-balance-all is disabled by default.

 

 

vjoshi_FTNT

Hello Lucas,

 

Sorry, what do you mean by 'no charge'?

 

If it is in lab and you are testing this, fine.

 

If this is just a test bed and you are planning for a production setup, and if you really want to use the HA for optimum load balancing, I would suggest virtual clustering with VDOMs.

 

This is possible in a-p mode where each device will be master for specific VDOMs and other device will serve as Slave unit.

 

Cheers,

 

 

 

lpiris wrote:

Hi vjoshi,

 

Thanks.

 

The strange thing is that this environment is lab, has no charge. :(

 

Regards

Lucas

 

Lucas_Piris

Hi Joshi,

 

Sorry, I wanted to talk without load.

 

Actually we have a HA in production, And we have this behavior.

 

So, We made lab with two 110C FG and we can see the same behavior.

 

Regards

Lucas

 

vjoshi wrote:

Hello Lucas,

 

Sorry, what do you mean by 'no charge'?

 

If it is in lab and you are testing this, fine.

 

If this is just a test bed and you are planning for a production setup, and if you really want to use the HA for optimum load balancing, I would suggest virtual clustering with VDOMs.

 

This is possible in a-p mode where each device will be master for specific VDOMs and other device will serve as Slave unit.

 

Cheers,

 

 

 

lpiris wrote:

Hi vjoshi,

 

Thanks.

 

The strange thing is that this environment is lab, has no charge. :(

 

Regards

Lucas

 

vjoshi_FTNT
Staff
Staff

Hello Lucas,

 

I got it. It is strange it happens without load.

 

Is it causing any specific issue to the application?

Lucas_Piris

Hi Josh,

 

Yes! this customer have an internal application that are impacted.

We had to change ha mode to a-p, and it works fine.

 

I will monitoring anothers HA, To see if I can find the same behavior.

 

Cheers

Lucas

 

vjoshi wrote:

Hello Lucas,

 

I got it. It is strange it happens without load.

 

Is it causing any specific issue to the application?

vjoshi_FTNT
Staff
Staff

Hello Lucas,

 

Do you see the same behavior in your lab setup as well?

 

 

Lucas_Piris

Hi Josh,

 

yes.

 

vjoshi wrote:

Hello Lucas,

 

Do you see the same behavior in your lab setup as well?

 

 

vjoshi_FTNT
Staff
Staff

Hello Lucas,

 

Weird, I expect it to happen, but without any traffic doesn't seem to be correct.

 

I would recommend not to use the load balance all, instead use the virtual cluster for effective load sharing.

 

 

Labels
Top Kudoed Authors