CUCM Capacity Resizing

[Zekeria Sammantar]

Hi,

Is it possible to resize my Call Manager cluster to get ride of some extra Vitrual Machines(VM) (This is all running on Cisco UCS)

for example (current cluster)

Phones = 10,000

Using 2500 (larger vDisk),

4 GB RAM

1x80 Gb

1 vNic

4 subscribers each with 2,500

2 subscribers for failover (1:2)

                                             and

1 Publisher

1 Standalone TFTP

is it possible to resize the CUCM to elimint some of the CUCM VM's

for example

2 subscriber with 7,500 capacity (Call Processing Agent)

1 publisher

1 Standalone TFTP

(This would save me alot of RAM and when failure occures in 1 of the subscribers 75% phones will be preserved)

Originaly it was 8 serves and now 4 server's

OR

for example

4 subscriber with 2,500 capacity (Call Processing Agent)

and 1 extra subscriber with 7,500 capacity (eliminating 2 subscriber for failover)

1 publisher

1 Standalone TFTP

This would save some RAM on the vitrualization side since I dont need to use 2 vm's as backup instead only 1 vm with a little extra RAM

Originaly it was 8 serves and now 7 server's

My Main question is Can I Resize my CUCM's after they have been fully configured?

Thanks.

[Chris Deren · Accepted solution]

You can resize CPU and RAM, but not disk space, so if the different OVAs require different disk space allocation you would need to re-install the app.  This is described here:

http://docwiki.cisco.com/wiki/Unified_Communications_VMware_Requirements#Resize_Virtual_Machine

HTH,

Chris

[Zekeria Sammantar]

One more questions regarding Clusters

a.) In cisco srnd is states that a Cluster can have max 20 servers and only 8 running CUCM Service's.

Are they counting the backup servers running CUCM Service with a 1:1 model

for example I have 20,000 Phones and I'm using 2,500 OVA

And I'm running 8 Primary subsribers in different cucm groups with each one idle backup server, does this bleed into aMega-Cluster or is this a regular Cluster

b.) What the real difference between a normal Cluster and Mega Cluster since they both have max call processing servers listed as "8". ?

c.) Is there away to find out if a cluster is a megacluster?

d.) If I use a 2:1 model in  Mega cluster, will there be any technical issue's or/and void cisco support.

Thanks

[Jaime Valencia · Accepted solution]

You cannot have a mega cluster or super cluster if it has not been validated and approved by cisco as there is a separate team that supports them, you cannot just create one and expects us to support it.

Sent from Cisco Technical Support iPad App