[cisco-voip] Standby publisher

[Eric Butcher]

The cost / benefit analysis of this is a pretty hard sell, but if you're looking to squeeze that last bit of redundancy out of an already very redundant phone system...  It can be done.  Not as simple as plugging it in, powering it up, and loading licenses though.  There would need to be a tac case involved anyway.


Eric Butcher
Cisco Unified Communications Engineer
CDW Professional Services
11711 N Meridian, Ste 225
Carmel, IN  46032
C 317.569.4282 - IP Phone
  765.744.1458 - Mobile
  eric.butcher at cdw.com
www.cdw.com
 

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
Sent: Thursday, July 01, 2010 9:28 AM
To: Bill
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Standby publisher

No you can't.  All database changes can only be made to the publisher.  This changes a bit in 6.x where the "user facing features" are written on each node, and replicated out to other nodes in realtime.  This is what lets you set and clear CFA with the pub down in later versions.

See http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/rel_notes/6_0_1/cucm-rel_note-601a.html#wp44437 for specfics.

Having a standby publisher installed and ready for restore is not a bad idea but you will be restricted by licensing (P1 TAC SR with the licensing team should get you rehosted pretty quickly I hope).  The only thing to worry about wrt to IP address is if the pub is specified in System->Server by IP address this would cause problems after the restore.   This could be avoided simply by changing the IP address to match the failed publisher before starting the restore.

-Ryan

On Jul 1, 2010, at 9:18 AM, Bill wrote:

Also, at least in the 4.x days, you can still make changes to the subscriber if the publisher is down. 

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Thursday, July 01, 2010 7:43 AM
To: Andrius Kislas
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Standby publisher

What about the license? The license relates to the MAC address of the server??

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
 CCIE#24697 (Voice)
 


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Andrius Kislas
Sent: Thursday, July 01, 2010 1:17 PM
To: Cisco Voip
Subject: [cisco-voip] Standby publisher

Hi All.

Correct me if I am wrong, but when the publisher fails the biggest impact we have is not being able to change configuration. In large environments this might be serious impact.

My question is - does anybody use a standby/cold publisher that has the only task - sit and wait until the primary publisher fails? This standby published would ba standalone (not a member of existing cluster), would have different IP address (in the same subnet) and the same name as existing publisher, would have no licenses uploaded and would be kept in the same version as primary publisher. During primary publisher failure we would need to change IP address and perform disaster recovery. This would save us some time that we would typiacly need to get new server, install new publisher, upgrade it and finally perform recovery.

Does it sound fine or are there any caveats for such approach?

Regards,
Andrius

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