[Asterisk-biz] Clustering Solutions for Asterisk

[Carlos]

yea linux ha seems to work for a fail over solution we do that on one of our
setups except we are using an external fiber raid array running gfs file
system so the data is always the same on on the fail overs. Note this is not
a cheap solution.  As far as handleing the t1's failing over you could use a
adtran atlas they are fairly cheap and are easy to use that could handle
splitting off your t1's to different machines. 

Carlos Alcantar
Race Technologies, Inc.
101 Haskins Way
South San Francisco, CA 94080
P: 650.246.8900
F: 650.246.8901
E: carlos at race.com

-----Original Message-----
From: asterisk-biz-bounces at lists.digium.com
[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of Jon Carnes
Sent: Sunday, October 02, 2005 11:35 AM
To: Commercial and Business-Oriented Asterisk Discussion
Subject: Re: [Asterisk-biz] Clustering Solutions for Asterisk

Paul,

If you don't load the drivers for the T-1 hardware then you should be able
to simply run a pass-through cable connecting to your second server's T-1
hardware.  This will work on fail-over only if the primary powers down -
which you can do using a UPS that is intelligent.

I use a set of scripts that mirror the primary to a secondary and keep the
secondary up-to-date (within 24 hours of changes to the primary).

http://www.trilug.org/~jonc/Failover_scripts/

I've been using the same set of scripts for about 5 years. They work fine
for all my Master/Slave setups.

I'm new to the list, but we've been using Asterisk for corporate use for
over three years now.

Jon Carnes
FeatureTel

On Sun, 2005-10-02 at 13:36, Paul wrote:
> I am working on a similar problem and have some ideas for you.  First 
> I'm using two servers with a T1 card in each.  I have two companies 
> currently in the same location so the IP range can be in the same 
> subnet without worrying about SER or the like.
> 
> In order for two companies to be on their own server yet be redundant 
> to each other I have devised a calling plan where both extensions are 
> dialed to reach the user (and both extensions have voicemail).  As an 
> example, operator for company one is extension 200 as well as 200 on 
> the backup (second company) server and the extensions file dials both 
> (using IAX to link servers). So regardless of phone registration, the 
> call can be answered.
> 
> Each server has the same configuration (a complete mirror copy) 
> allowing the dial out to use the PRI line that is active (there is 
> only one - again IAX
> link)
> 
> Since I have not found any T1 cards that offer failover yet, the 
> customer must move the T1 cable.  I was thinking about using the led 
> power on the T1 card (when polarity reverses to red) and wire it to an 
> optoisolator, time delay and old fashion relay to move the T1 to the 
> second server if I cant find an external T1 failover switch for a good
price.
> 
> I did speak to Sangoma Technologies about adding this feature to their 
> card but they have not done so yet.
> 
> I have been playing with this for a month now and some of the problems 
> I'm facing are the refusal of SIP 7.5 on Cisco's 7960s to use the 
> emergency proxy when the primary is not responding.
> 
> Some other minor problems are how to move the voice mail back to the 
> correct servers as well as the call reporting.  I'm approaching this 
> from two avenues -
> 1 - Internal cron jobs looking at each others servers to pull the data 
> back
> 2 - A separate Win XP station using a custom VS net program into the 
> mysql databases of each server as well as possibly being the trigger 
> for the T1 failover.
> 
> I have not finished this yet, but if anyone has any ideas or has tried 
> what I am trying please let me know also.  Also - interesting thought 
> about the linking of servers, does the IAX link cause a transcode on 
> inbound and outbound (extension to extension as well as extension to T1
BETWEEEN BOXES)?
> Should I link them through SIP which is used by all phones?
> 
> I'm just trying to use the mirror approach which is great for SMB's - 
> my market.
> 
> Paul Norris
> (631) 878-6438
> Silicon Valley Products
> E. Moriches, NY
> 
> 
> 
> 
> 
> 
> 
> >Has anyone real experiences with clustering for Asterisk ?
> 
> >I already did some googling, and also look at wi-ki for solutions for 
> >High Avaiability, but I did not find enough info to aply a solution 
> >for my customer.
> 
> >He wants a cluster, and if possible, to have their staff load 
> >balanced to two asterisk. When one of them crash or does not works 
> >correctly, the other one should make his job on a transparent work to the
users...
> 
> >So, I prefer an active-active cluster, but if that is impossible to 
> >cover, it is Ok to have an active-passive cluster.
> 
> >It would be nice if also it could cover the following
> 
> >- Customer has only on PRI (E1) line... Is there any way for both 
> >asterisk to use the same circuit ?
> 
> >Also, for small installations (to 8 extensions) I would need a 
> >solution for the main operator phone to remain active if Asterisk 
> >goes down. I mind, if PBX does not work, the external line should at 
> >least get connected dirctly to the phone and allow them to receive 
> >calls until situation is solved. Any idea on this ?
> 
> 
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