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Okay but the two masters will be masters of different director groups
ie.
service1 has master1 and slave1
service2 has master2 and slave2
service1 and service2 are complete exclusive of each other.
They just all happen to be on the same subnet.
The reason we're interested in this is because the total bandwidth needed
will be greater than a single machine can handle. Our services on the
first cluster will have a combined bandwidth capable of 950 Mb/s at any
time , adding an additional service will put us past the Gb/s threshold.
So in the case of a single machine taking over the service I need to maintain
the ability to handle the bandwidth
So I guess the question is can two completely separate lvs clusters exist
on the same subnet? Will the mcasts interfere with each other?
Thanks,
Ramon Kagan
York University, Computing and Network Services
Unix Team - Intermediate System Administrator
(416)736-2100 #20263
rkagan@xxxxxxxx
On Thu, 23 May 2002, Alexandre CASSEN wrote:
>
>
> Hi Ramon,
>
> > Our routers allow multicast on a single subnet at a time. This isn't a
> > problem but what happens if I have two sets of two lvs machines clustered
> > with keepalived. Will there be contention with two lvs synch daemons
> > being masters on the same subnet?
>
> Ok, if you want to run a active/active LVS cluster using LVS syncd you will
> be in front of the following problems :
>
> 1. Currently LVS syncd support 2 states : MASTER & BACKUP, in MASTER state
> syncd adverts are sent to the syncd mcast group. MASTER thread only send
> advert, it doesn t handle inbound adverts. If you plan to run active/active
> setup you need a conceptual syncd state that handle inbound adverts.
>
> 2. Introducing this inbound MASTER stream handling, you need to introduce a
> "on the fly" state transition between MASTER to BACKUP (& vis-versa). => or
> only define one state : the MASTER that send advert and handle inbound
> adverts => group MASTER & BACKUP states...
>
> So currently if you run active/active setup your both lvs syncd into your
> LVS director will be in MASTER state, sending adverts... But no one will
> receive them (except if you add a third LVS director in syncd backup :)).
>
> So currently only use lvs_syncd on one director (this will add half
> failover connection table).
>
> Best regards,
> Alexandre
>
>
>
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