CUCM-11.5 IOWAIT and IPOS Requirements

[aniket0422]

Can someone please help me with below details.

Application Short Name	Application Long Name	Release	VM Name	Min IOPS/instance	Typical IOPS	Max IOPS	IOPS Block Size	CPU Util Min Treshold	IO Wait Min Treshold	Network Bandwidth Requirements
CUCM	Unified Communications Manager Release	11.0	CallCtrl: 150 users
CUC	Unity Connection Release	11.0	1,000 users
CUCCX	Cisco Unified Contact Center Express / Unified IP IVR Release	11.x	Main: 100 agents
QM Recording	Cisco Unified Contact Center Express / Unified IP IVR Release	11.0	QM Recording Server 4vCPU

[Jonathan Schulenberg]

This is, to some extent, implementation/load-dependent. The only data I am aware of Cisco publishing on this front is here:

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/cisco-collaboration-virtualization.html

For example, clicking on CUCM shows some IOPS related data at the bottom of the page:

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-communications-manager.html#iops

[amanchau · Accepted solution]

Hi Aniket,

As per my understanding and according to the snap you want to check for the IOPS for the specific version.

As rightly mentioned by Jonathan, IOPS will vary depending upon the activity in your cluster like : sending data to billing servers, collecting logs, backups.

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-communications-manager.html#iops

Also IOwait indicates high disk I/O activities, The number of CPUs you have affects your percentage

I have seen high Iowaits causing issues, High Iowait can be due to several reasons : Hardware, db etc.

Anything over and above 25-30 % should be a concern.

You can use the perfmon tool to isolate and troubleshoot further.

Thanks & Regards

Aman Chaudhary 

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