[cisco-voip] Unity Connection 10.5.2 Split Brain Recovery

[Erick Wellnitz]

The error I get on CUC publishers is that it must be stratum 6 or better.
10.5.2 SU1 and better versions building in a dead network for hardware
migration.

I would agree that the closer to 1 you can get, the better.

Worst case, since DNS is no longer taboo, is to sync directly with a
stratum 1 time server in the wild.

On Wed, Oct 28, 2015 at 12:09 PM, Daniel Pagan <dpagan at fidelus.com> wrote:

> 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
>
>
>
> 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>
> 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>
> 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] *On Behalf
> Of *Aaron Banks
> *Sent:* Wednesday, October 28, 2015 12:39 AM
> *To:* Ryan Huff; 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
> To: amichaelbanks at hotmail.com; 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
> 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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