[cisco-voip] CallManager DR scenario

[Ed Leatherman]

We have a very similar setup (pub+2 subs at one site, 2subs across town at
another site). I have a spare MCS of the same model sitting at the secondary
site for this purpose, just rebuild the pub from an offsite BARS backup and
move the subnet to there. can't do any changes till publisher is back up
though.

basically it sounds like you need a strategy to rebuild a publisher quickly
so you can continue doing changes.

On 6/26/06, Ted Nugent <tednugent69 at yahoo.com> wrote:
>
> Correct SUBs are read only and the SUB pull down thier
> subscription from the PUB, there is no replication if
> the PUB is gone. If you require the PUB at the HQ site
> then the only alternative that I see if HQ goes away
> is to have a cold standby MCS at the DR site and
> perform a BARs recovery onto the the NEW PUB and or
> rotate a single mirrored drive out to the DR site.
>
> --- "Voll, Scott" <Scott.Voll at wesd.org> wrote:
>
> > To my understanding you can not make changes to the
> > Cluster without the
> > Pub.  The sub's have a read only DB.
> >
> > With that said.... all other questions are null and
> > void.
> >
> > Like you said, the question is where can you put the
> > pub so it is always
> > alive.
> >
> >
> > Scott
> >
> >
> > -----Original Message-----
> > From: cisco-voip-bounces at puck.nether.net
> > [mailto:cisco-voip-bounces at puck.nether.net] On
> > Behalf Of Carter, Bill
> > Sent: Monday, June 26, 2006 10:56 AM
> > To: cisco-voip at puck.nether.net
> > Subject: [cisco-voip] CallManager DR scenario
> >
> >
> > I am implementing a CallManager cluster with servers
> > located at both HQ
> > and a DR site.  The Publisher will be located at HQ,
> > with 2 subscribers
> > at HQ and the 2 subscribers at the DR site.
> >
> > If HQ is offline for an extended period of time
> > (building blows up), the
> > publisher will not be available.  In this situation,
> > CallManager
> > configuration changes will probably have to be made,
> > but the publisher
> > will be down.
> >
> > * Can changes be made to the system without an
> > active publisher?
> >
> > * I know subscriber won't replicated database to
> > other subscribers.
> > What happens when the publisher comes back online?
> > Are changes
> > replicated from Subscriber to Publisher?
> >
> > * With 2 subscribers located at the DR site, will I
> > have to make
> > configuration on both subscriber CallManagers (see
> > previous question)?
> >
> > * In a period of extended outage, I assume it would
> > be best to restore
> > the Publisher to one of the Subscribers at DR,
> > correct?
> >
> > It seems like a Catch-22 for CallManager DR design.
> > Do you locate the
> > Publisher at HQ or DR?  I guess it depends on which
> > site will go
> > down?!?!?  HaHaHa!!
> >
> >
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-- 
Ed Leatherman
IP Telephony Coordinator
West Virginia University
Telecommunications and Network Operations
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