[cisco-voip] Unity Connection 10.5.2 Split Brain Recovery

[Daniel Pagan]

Just a heads up, Cisco recommendation for CUCM is that NTP stratum should be 3 or better to avoid DB replication issues.

http://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/118718-technote-cucm-00.html

“Stratum level should be less than 4 on publisher for optimal performance”

CUC documentation isn’t very clear on this specifically - CUC 10x docs mention stratum 9 or better but that sounds wrong IMO.

I would follow the same recommendation documented for CUCM (stratum 3 or better) on CUC.

HTH

- Dan


From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick Wellnitz
Sent: Wednesday, October 28, 2015 1:41 PM
To: Charles Goldsmith <wokka at justfamily.org>
Cc: voip puck <cisco-voip at puck.nether.net>; Aaron Banks <amichaelbanks at hotmail.com>
Subject: Re: [cisco-voip] Unity Connection 10.5.2 Split Brain Recovery

I like both IOS and Linux ntpd

I synch those with time.nist.gov<http://time.nist.gov>

Remember that you need a stratum 6 or better to sync UC apps like connection or CUCM.

On Wed, Oct 28, 2015 at 11:35 AM, Charles Goldsmith <wokka at justfamily.org<mailto:wokka at justfamily.org>> wrote:
I personally prefer an IOS based device, a core switch or router.

On Wed, Oct 28, 2015 at 12:33 PM, Thomas LeMay <thomaslemay at comcast.net<mailto:thomaslemay at comcast.net>> wrote:
Hi,

Questions: What is the best business practice for the type of NTP server to use as the source: windows or some other operating system?

Thank you,

Tom

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>] On Behalf Of Aaron Banks
Sent: Wednesday, October 28, 2015 12:39 AM
To: Ryan Huff; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Unity Connection 10.5.2 Split Brain Recovery

Thank you for all of that.  You know what it was - NTP.  I shut down the HA.  NTP was doing weird things on the primary node and I asked the customer if the NTP server address he gave me was a windows server.  Bingo.  I changed the NTP source, rebooted the primary, called voicemail and then powered on the HA.

Lesson learned.
________________________________
From: ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>
To: amichaelbanks at hotmail.com<mailto:amichaelbanks at hotmail.com>; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] Unity Connection 10.5.2 Split Brain Recovery
Date: Tue, 27 Oct 2015 17:25:47 +0000
1.) Shut down the HA node.

2.) Reboot the primary node

3.) Once the primary node is up, place a call into voicemail

4.) Power the HA node back on

5.) Once HA is up, verify HA status.



Sent from my T-Mobile 4G LTE Device


-------- Original message --------
From: Aaron Banks
Date:10/27/2015 12:35 PM (GMT-05:00)
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: [cisco-voip] Unity Connection 10.5.2 Split Brain Recovery


Has anyone seen/resolved a split brain recovery in Unity Connection 10.5.2?  The primary and secondary keep swapping back and forth every few minutes.  I can ping and trace to each server.  I restarted the primary but that did not resolve the issue.  In the RTMT system logs, the secondary sends an NTP query to the primary the response is the primary is inaccessible or down.  I'm stumped.

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