[cisco-voip] increasing VM virtual memory?

[Anthony Holloway]

Nick,

It's actually pretty common, when doing upgrades, that minimum RAM
requirements go up, and you have to increase the allocated RAM and
reservation.

Example:

CUCM 10x 2,500 OVA requires 4GB RAM
<http://docwiki.cisco.com/wiki/Virtualization_for_Cisco_Unified_Communications_Manager_(CUCM)#Version_10.x>
CUCM 11x 2,500 OVA requires 6GB RAM
<http://docwiki.cisco.com/wiki/Virtualization_for_Cisco_Unified_Communications_Manager_(CUCM)#Version_11.x>

Therefore, an upgrade on a 2,500 OVA from 10x to 11x causes a RAM increase

And it's stated as having changed in the OVA for v11x Read Me
<http://www.cisco.com/web/software/283088407/126036/cucm-11.0.ova.readme.txt>

The following are changes from the OVA in the previous (CUCM 10.x) release:

        1) vRAM size has been increased by 2GB for 11.0(1) and above releases.

The procedure is also thinly covered in the OVA Read Me as well:

Upgrades from previous release:

	1) Power off the VM.

	2) Modify the vRAM, CPU, reservations,and OS based on the changes
listed above via the vmware-viclient. Note, do not attempt to change
the number of disks or disk size.

	3) Modify the Network Adapter.  See “Modifying the Network Adapter” section.

        4) Modify the VM Version if previously using VM Version 7. See
"Instructions to upgrade the virtual hardware version" section.

	5) Save the changes

	6) Power back on the VM

I say all of that, not because you indicated that you are performing an
upgrade, but simply to illustrate that there are some cases where you MUST
change the RAM, and therefore it makes sense that changing RAM is trivial
and supported.  Mostly...

Because, a negative issue I've seen come of this, is a UCCX system where it
was originally deployed for 100 Agents, and someone increased the RAM, and
then the system started complaining that it was a 300 Agent system with
insufficient resources (everything except RAM).  The system was working
fine, mind you, it was just the annoying warning banner in AppAdmin.  So,
get the warning to go away, that person just dropped the RAM back down to
the original value.

On Thu, Mar 10, 2016 at 8:35 AM, Barnett, Nick <
Nick.Barnett at countryfinancial.com> wrote:

> Are there any negative issues that arise from increasing the RAM on a CUCM
> 10.0 or CUC 10.5 VM?  I haven’t ever seen anyone talk about it. I assume
> that is because there is typically an underlying issue that should be
> resolved rather than just increasing RAM. Does anyone have any input on
> this?
>
>
>
> Thanks,
>
> Nick
>
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>
>
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