[cisco-voip] UCS chassis redundancy

Tue Aug 30 13:12:11 EDT 2011

I'd have to agree with Dennis, and not just because we work at the same company. :)

Yes, bandwidth is cheap, Erick.  However, experience has shown that a branch office running a few bonded T1s or T3s isn't going to be as reliable as a customers data center LAN.  If you put a subscriber out at a remote site, running on an ISR G2, can you image the impact of that site's circuit was flapping over a few days (carriers aren't always the quickest to dispatch)?

I would rather keep my CUCM servers in 1-2 data centers with some sort of other resilient data connection in between.  If one of the branches has a circuit flap issue, only that branch is affected, not the entire environment.

Scalability is another thing.  Unless you setup a supercluster, you're not going to get past the eight subscriber limitation in CUCM.  You're going to wind up with some sites running off a remote CUCM anyway.

Last thing…  Cisco is extremely strict regarding the hardware requirements for virtualized UC servers.  I can't imagine them ever approving an ESXi-based UC solution running off a service module.  Even the SRE-910SM falls short with a Intel Core Duo, 1.86 Ghz and 8GB of RAM.  Such a setup would only potentially be able to support a single UC virtualized application.

Thanks!

Matthew Berry, CCIE #26721 (Voice)
CDW | Sr. Unified Communications Engineer
Single Number Reach: +1.763.592.5987
Email:  matthew.berry at cdw.com

From: "Wellnitz, Erick A." <erick.wellnitz at kattenlaw.com<mailto:erick.wellnitz at kattenlaw.com>>
Date: Tue, 30 Aug 2011 16:59:50 +0000
To: Dennis Heim <Dennis.Heim at cdw.com<mailto:Dennis.Heim at cdw.com>>, Lelio Fulgenzi <lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>>, Nick Matthews <matthnick at gmail.com<mailto:matthnick at gmail.com>>
Cc: "cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>" <cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>>
Subject: Re: [cisco-voip] UCS chassis redundancy

We already do it with standard server hardware.  Database replication is a non-issue.  Bandwidth is cheap.  Upgrades aren’t a problem  seeing as they can be staged and run the ‘switch version’ command at a later time.

Lower bandwidth situations would be a no go.

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Dennis Heim
Sent: Tuesday, August 30, 2011 11:54 AM
To: Lelio Fulgenzi; Nick Matthews
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] UCS chassis redundancy

I am going to go with “NO” on that. Imagine database replication across all sites? Imagine doing major version upgrades.

Dennis Heim
Network Voice Engineer
CDW  Advanced Technology Services
10610 9th Place
Bellevue, WA 98004

317.569.4255 Single Number Reach
317.569.4201 Fax
dennis.heim at cdw.com<mailto:dennis.heim at cdw.com>
cdw.com/content/solutions/unified-communications/<http://www.cdw.com/content/solutions/unified-communications/>

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Tuesday, August 30, 2011 8:51 AM
To: Nick Matthews
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] UCS chassis redundancy

won't it be great when the VMware service modules on the ISR G2s support installing CUCM on it? a full subscriber at each remote site. ;)

---
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Cooking with unix is easy. You just sed it and forget it.
                              - LFJ (with apologies to Mr. Popeil)
________________________________
From: "Nick Matthews" <matthnick at gmail.com<mailto:matthnick at gmail.com>>
To: "Erick A. Wellnitz" <erick.wellnitz at kattenlaw.com<mailto:erick.wellnitz at kattenlaw.com>>
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Sent: Tuesday, August 30, 2011 11:42:59 AM
Subject: Re: [cisco-voip] UCS chassis redundancy

I'm seeing a lot of B-series at the data center and a C-series at a remote site or DR.  Otherwise, a second chassis isn't *too* expensive.  The bulk of the cost is in the blades and the 6100s.  You still need power supplies, IO, chassis, but it's not too bad.  Seeing a decent amount of 2nd chassis as well.  A lot of the DC types that are putting their blades in there as well help offset the cost.

-nick
On Tue, Aug 30, 2011 at 9:46 AM, Wellnitz, Erick A. <erick.wellnitz at kattenlaw.com<mailto:erick.wellnitz at kattenlaw.com>> wrote:
Has anyone had issues with the UCS blade chassis being a single point of failure?    What happens if the chassis itself fails?  DO people have redundant chassis installed?  A C series UCS for disaster situations?

I don’t like having all my eggs in one basket.

ERICK A. WELLNITZ
Network Engineer
Katten Muchin Rosenman LLP

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