Low Virtual Memory on CUCM

[Vishal Parekh]

Hello All,  

I am facing the same kind of error on my Call manager (Version running 10.5.2.12901-1)

Below are the error which I am receiving from RTMT & also find the below output of "utils core active list" & "utils diagnose test"

RTMT Error:

1. UsedDiskSpace : 92 MessageString : Common Disk utilization hits LWM!

2. Available virtual memory below configured threshold . Configured low threshold is 30 % tomcat#1 (1858 MB) uses most of the memory. 

Output from PUB CLI

admin:show status

Host Name : cucm01
Date : Mon Apr 24, 2017 12:55:06
Locale : en_US.UTF-8
Product Ver : 10.5.2.12901-1
Unified OS Version : 6.0.0.0-2

Uptime:
12:55:07 up 10 days, 21:22, 1 user, load average: 0.26, 0.42, 0.57

CPU Idle: 83.33% System: 07.29% User: 07.81%
IOWAIT: 01.04% IRQ: 00.00% Soft: 00.52%

Memory Total: 3925704K
Free: 113892K
Used: 3811812K
Cached: 387972K
Shared: 0K
Buffers: 51780K

Total Free Used
Disk/active 14643120K 1798244K 12696112K (88%)
Disk/inactive 14643056K 1896528K 12597764K (87%)
Disk/logging 50989088K 4112436K 44286476K (92%)

admin:utils core active list
No core files found

admin:utils diagnose test

Log file: platform/log/diag4.log

Starting diagnostic test(s)
===========================
test - disk_space : Passed (available: 1757 MB, used: 12399 MB)
skip - disk_files : This module must be run directly and off hours
test - service_manager : Passed
test - tomcat : Passed
test - tomcat_deadlocks : Passed
test - tomcat_keystore : Passed
test - tomcat_connectors : Passed
test - tomcat_threads : Passed
test - tomcat_memory : Passed
test - tomcat_sessions : Passed
skip - tomcat_heapdump : This module must be run directly and off hours
test - validate_network : Passed
test - raid : Passed
test - system_info : Passed (Collected system information in diagnostic log)
test - ntp_reachability : Passed
test - ntp_clock_drift : Passed
test - ntp_stratum : Passed
skip - sdl_fragmentation : This module must be run directly and off hours
skip - sdi_fragmentation : This module must be run directly and off hours

Diagnostics Completed
The final output will be in Log file: platform/log/diag4.log
Please use 'file view activelog platform/log/diag4.log' command to see the output.

I have restarted the Cisco Tomcat service but then after also I am receiving the same kind of error.

What should i do further to fix this issue ?

Regards, 

Vishal

[Rajan]

Hi Vishal,

RTMT Error:

1. UsedDiskSpace : 92 MessageString : Common Disk utilization hits LWM!

For this error, you could free up space in the common partition using any of the following method.

http://docwiki.cisco.com/wiki/Unified_CM_L2_Upgrade_Disk_Space_issues

You could also use the cop file 

ciscocm.free_common_space_v1.3.k3.cop.sgn

available to free up space on common partition

https://software.cisco.com/download/release.html?mdfid=285963825&flowid=77896&softwareid=282204704&release=COP-Files&relind=AVAILABLE&rellifecycle=&reltype=latest

2. Available virtual memory below configured threshold . Configured low threshold is 30 % tomcat#1 (1858 MB) uses most of the memory. 

This can be ignored I guess as the default threshold was 15% but the configured one in your case is 30%. If it went below 15%, that's really critical. But still if you want to know the root cause for this high memory utilization, you can collect all the below mentioned logs ( for HIGH CPU/MEMORY UTILIZATION) for the time period and contact TAC to find the root cause for the spike.

https://supportforums.cisco.com/document/126941/cucm-trace-lookup-different-scenarios 

HTH

Rajan

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[Mohammed al Baqari]

Hi, if you can increase the disk space for the 1st alarm it would be better or delete unnecessary files (firmwares). Free Disk space option will delete the inactive partition which disables rollback option in future upgrades.