[Serusers] SER-Redundancy by Master/Slave-Location-DB

[Andreas Granig]

See comments inline...

Greger V. Teigre wrote:
> Have a look at:
> http://www.iptel.org/ser/doc/modules/html/usrloc.html#AEN153

Synchronization *to* a DB works of course out of the box (needed for 
saving locations).

But for clustering you will need to synchronize your memory *from* the 
DB or from the memory of the other nodes on the fly to get locations 
from other nodes so you can lookup them again.

>    Locations are not really that critical, are they?  If you use 
> registration intervals of ex. 10 minutes, how do you even manage to 
> synchronize the databases manually?

We've about 20.000 users, which would result in ~2.900.000 successful 
registrations per day or ~35 successful registerations per second, and 
that means ~70 register messages per second (because of the www_challenge).

Replicating on SIP layer means that every successful REGISTER has to be 
sent to every server, so IMHO this just will not scale.

Cheers,
Andy