[OpenSER-Users] Problems trying to build an Active/Active OSer 1.3 cluster

[Stefan Sayer]

Hi Iñaki,

Iñaki Baz Castillo wrote:
> El Martes, 22 de Enero de 2008, Stefan Sayer escribió:
>> Hello,
>>
>> Raúl Alexis Betancor Santana wrote:
>>> Hi all, I'm trying to build an Active/Active OpenSer 1.3 cluster with
>>> 2 nodes.
>>>
>>> All it's working ok for the REGISTER messages throught the use of
>>> t_replicate and add_path, but I've problems with the INVITE messages.
>>>
>>> Both servers share the same location table on a PostgreSQL Multimaster
>>> cluster (but that's irrelevant, the PostgreSQL cluster I mean...),
>>>
>>  > using db_mode = 2
>>
>> just out of curiosity: if you have DB multimaster replication in place,
>> why do you replicate REGISTERs on SIP level as well?
> 
> Because "db_mode=2":
> 
> http://www.openser.org/docs/modules/1.3.x/usrloc.html#AEN285
> 
>   2 - Write-Back scheme. This is a combination of previous two schemes. All 
> changes are made to memory and database synchronization is done in the timer. 
> The timer deletes all expired contacts and flushes all modified or new 
> contacts to database. Use this scheme if you encounter high-load peaks and 
> want them to process as fast as possible. The mode will not help at all if 
> the load is high all the time. Also, latency of this mode is much lower than 
> latency of mode 1, but slightly higher than latency of mode 0.

thanks for the hint and link. but why not use db_mode 1 or better 3 and 
skip SIP REGISTER message replication with multimaster DB? is this too 
slow? to OP: do you have any numbers on postgresql multimaster 
replication performance? are you using pgcluster?

still puzzled
Stefan

> 
> 
> 

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