[cisco-voip] Clustering over WAN - Design question

[Voice Noob]

Is this calculation correct? I have a customer that wants to do split
cluster over the wan. PUB, Sub1 at HQ and SUB2 at DR site. Do they need 4.5
meg of bandwidth dedicated for this? 

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Phil G
Sent: Friday, October 02, 2009 9:08 AM
To: Wes Sisk
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Clustering over WAN - Design question

That means, if i have the following environment:


SITE A                          SITE B

Pub                               Sub2
         -------  WAN  ------
Sub1


Pub, Sub1 and Sub2 are all running ccm.exe, ICCS-real-time traffic would 
be 1,5 Mbps from Sub2 to Pub plus 1,5 Mbps from Sub2 to Sub1. Plus 
additional 1,5 Mbps ICCS database traffic from Sub2 to Pub. That means 
4,5 Mbps over WAN. Correct?

If i add another SITE C with a Sub3, then there would be an additional 
1,5 Mbps between SITE C and SITE B plus the existing 4,5 Mbps between 
SITE A and B and another 4,5 Mbps between SITE A and SITE C?


Another question: Do you have any experience how good the database 
replication will start again after a WAN-failure. Problem is that we 
have a remote site with SRST. Now there are frequently WAN-link-failures 
and the people are complaining about the feature-set in SRST. The idea 
is now, that we place a subscriber-server at this site and raise the 
bandwidth. Now with the given reliability of the WAN-link, i am fearing 
about other "symptoms" we will facing when the link is up again (broken 
replications or something like that). But also when there are other 
issues on the link like more packet loss.


Wes Sisk wrote:
> Correct, it is per server.  It is not "per site".
> On Friday, October 02, 2009 4:03:53 AM, Phil G <pgciscovoip at gmx.net>
wrote:
>> Hi!
>>
>> I have read the SRND-section of clustering over WAN and i have a 
>> question about bandwidth requirements: SRND states, that you need 
>> 1,544 Mbps minimum for sites that are clustered over WAN for ICCS 
>> real-time traffic. It says "sites" not "servers".
>>
>> And you need additional 1,544 Mbps for every subsriber server remote 
>> to the publisher for database traffic. Here is says "server" not "sites".
>>
>> Why is the real-time traffic independant of the number of servers at a 
>> site? I thought, the real-time traffic is fully meshed between each 
>> server running ccm.exe, so if i have 2 remote subscibers at a site, i 
>> would assume that i would have 1,544 Mbps to every other server 
>> running ccm.exe. So in a 2 site environment with 2 subsriber at each 
>> site i would have 4 ICCS-real-time-traffic flows, each with 1,544 
>> Mbps. Is that correct?
>>
>> _______________________________________________
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> 

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