[asterisk-users] Asterisk Redundancy

[Jared Smith]

On Tue, 2007-09-25 at 15:59 +0200, Per Jessen wrote:
> I haven't looked into it in any detail, but how about the standard Linux
> HA solution with a heartbeat monitor, a shared file-system and IP
> take-over? 

It's been my experience that this usually works fairly well for
stateless protocols like HTTP, but doesn't do so well on stateful
protocols like SIP and IAX, and in general is a much more difficult
problem to solve.

Most people tend to use some combination of SIP proxies (such as SER and
OpenSER), DUNDi, shared storage, redundant databases with replication,
T1/E1 failover boxes, and horizontal scaling to make Asterisk more
highly-available.  Of course, I haven't really gone into much detail
here, but hopefully it helps answer your question.  (It's also my
personal experience that people who know how to build such solutions are
making enough money off of selling their solution that they aren't real
eager to give away all their secrets.)

In reality though, you say the word "cluster" and it means five
different things to five different people.  To really be able to answer
the original poster's question, we'd really have to know a lot more
about his architecture and his potential points of failure.

-- 
Jared Smith
Community Relations Manager
Digium, Inc.