CUCM 8.6 - LowVirtualMemory alert

[Ayaz Khan]

We have two CUCM in our cluster on VM.  They both have 4 Gigs of RAM, in RTMT we are seeing  148 - 150 megs of free memory.  I need to confirm if this is acceptable.  If not where should I be looking next.

We also had a few LowVirtualyMemory starting last week.  The environment has 100 users, the only change made which was a week priory the alerts was, we added another Vcpu.  We only had one before.

If anyone has encountered this issue before or has any ideas please share.

Thansk,               

[Marko Farkas]

Hi Ayaz,

we had a similar problem at our cluster and the problem seems to be due to the CUCM version, we had 8.6.2.20000-2 version and upgraded to 8.6.2.22900-9 and now everything is working fine. I thinks it's a known bug in the prior version, try upgrading to the newest version, and if that doesn't work try opening a TAC case. Upgrade worked for us.

Marko

[Ayaz Khan]

Thanks for the repsonse, can you tell me how much free memory you had before and after the upgrade?

Ayaz

[Ayaz Khan]

I just checked the version of CUCM and they are at the suggested upgrade, 8.6.2.22900-9.

Ayaz

[Rishi Sethi]

Hi Ayaz,

Can you send the output of show status from the call manager CLI, its seen sometimes when call manager is running from a long time this issue appears..

Thanks

Rishi

[Akhilesh Singh]

Hello Ayaz,

First of all the the virtual memory usage going high is very normal in case of CUCM and it is acceptable as long as there is no production issue. I have seen usage going high as 98-99% and everything works fine without any issues.

Ususally Tomcat is always the highest consumer of memory so please check the process which is utilizing the highest memory first with " show process load memory".

Then check the number of active connections which CUCM is having and memory usage goes high if it is high and it happens generally when the CUCM has been up for a longer time, so you go for a reboot of the CUCM.

Akki

[Ayaz Khan]

Below is ther requested output,

admin:show status

Host Name    : PD76TXXX01
Date         : Fri Oct 5, 2012 12:44:12
Time Zone    : Eastern Daylight Time (America/Toronto)
Locale       : en_US.UTF-8
Product Ver  : 8.6.2.20000-2
OS Ver       : 5.0.0.0-2
License MAC  : c406e6abde11

Uptime:
12:44:14 up 20 days, 18:25,  1 user,  load average: 4.20, 3.76, 3.67

CPU Idle:   49.75%  System:   01.00%    User:   01.99%
  IOWAIT:   47.26%     IRQ:   00.00%    Soft:   00.00%   Intr/sec: 321.78

Memory Total:        4016920K
        Free:         159936K
        Used:        3856984K
      Cached:         394164K
      Shared:              0K
     Buffers:          36216K

                        Total            Free            Used
Disk/active         14410496K        2368760K       11892972K (84%)
Disk/inactive       14410560K       13499216K         167512K (2%)
Disk/logging        50179664K       30235108K       17354380K (37%)

=================================================================

10.76.161.60

admin:show status

Host Name    : PD76TXXX02
Date         : Fri Oct 5, 2012 12:45:59
Time Zone    : Eastern Daylight Time (America/Toronto)
Locale       : en_US.UTF-8
Product Ver  : 8.6.2.20000-2
OS Ver       : 5.0.0.0-2
License MAC  : 325e490660f1

Uptime:
12:46:00 up 20 days, 18:15,  1 user,  load average: 2.15, 3.14, 3.40

CPU Idle:   99.50%  System:   00.50%    User:   00.00%
  IOWAIT:   00.00%     IRQ:   00.00%    Soft:   00.00%   Intr/sec: 306.93

Memory Total:        4016920K
        Free:         157344K
        Used:        3859576K
      Cached:        1313536K
      Shared:              0K
     Buffers:         161360K

                        Total            Free            Used
Disk/active         14410496K        2322400K       11939332K (84%)
Disk/inactive       14410560K       13499216K         167512K (2%)
Disk/logging        50179664K       36211792K       11377696K (24%)

I would like to know if the there is enough free memory, or is it too low.  I don't want the system to crash if more memory is required.

Thanks,

Ayaz