IM&P VM Resizing ways

[silvakizir]

Hi guys.

I've read many posts but unfortunately I did not come to a conclusion.

I have the below scenarios of IM&P version 14 with 1,000 & 5,000 & 15,000 devices and I would like your opinion.

• Lets say I have a live and running IM&P version 14 VM with 5,000 devices and I want to resize it to 15,000 devices. In this case I need 2 more vCPUs and 2GB additional vRAM as CPU frequency and vDisk number/capacity remains the same. Can I shut down the VM, just manually from edit settings increase the vCPU to 4 and vRAM to 8Gb and power on the VM and everything will work as expected or is it better/recommended to take a backup, deploy a new 15,000 devices OVA and restore the server cause I've seen both answers?
• Lets say I have a live and running IM&P version 14 VM with 1,000 devices and I want to resize it to 5,000 devices. In this case I need 1 more vCPU and one more 80Gb vDisk. I assume that CPU frequency from 2.00 to 2.50GHz will be adjusted without any actions from me. Can I shut down the VM, just manually from edit settings increase the vCPU to 2 and add a second 80Gb vDisk and power on the VM and everything will work as expected or is it better/recommended to take a backup, deploy a new 5,000 devices OVA?
• What about similar resizing needs in CUCM, CUC, CUCCX? Which resizing actions should I follow?

[Jaime Valencia · Accepted solution]

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-software-requirements.html#resize_vm

[Roger Kallberg · Accepted solution]

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@silvakizir wrote:

• Lets say I have a live and running IM&P version 14 VM with 5,000 devices and I want to resize it to 15,000 devices. In this case I need 2 more vCPUs and 2GB additional vRAM as CPU frequency and vDisk number/capacity remains the same. Can I shut down the VM, just manually from edit settings increase the vCPU to 4 and vRAM to 8Gb and power on the VM and everything will work as expected or is it better/recommended to take a backup, deploy a new 15,000 devices OVA and restore the server cause I've seen both answers?

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Yes that is possible.

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@silvakizir wrote:

• Lets say I have a live and running IM&P version 14 VM with 1,000 devices and I want to resize it to 5,000 devices. In this case I need 1 more vCPU and one more 80Gb vDisk. I assume that CPU frequency from 2.00 to 2.50GHz will be adjusted without any actions from me. Can I shut down the VM, just manually from edit settings increase the vCPU to 2 and add a second 80Gb vDisk and power on the VM and everything will work as expected or is it better/recommended to take a backup, deploy a new 5,000 devices OVA?

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No you cannot do that. As you need to add a disk you'll need to do a backup and restore of DRA.

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@silvakizir wrote:

• What about similar resizing needs in CUCM, CUC, CUCCX? Which resizing actions should I follow?

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Each system has their own recommendations, you'd need to look it up per system type as there is no one fits all.

[silvakizir]

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