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David_Pascual_1's avatar
David_Pascual_1
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Oct 14, 2014

High CPU load during backup

Hi,

 

I have BIG-IP-LTM 2000 with 11.5.1 version. When I do a system backup ("save sys ucs" command or through graphical User Interface), I get high CPU load for 40 minutes:

 

 

I'd like to know if this is a normal behavior.

 

Regards David P.

 

3 Replies

  • shaggy's avatar
    shaggy
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    What process does "top" show with the highest CPU utilization when creating the UCS?

     

    If it's the csyncd process, it could be ID 424931 (search for the ID on https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-11-4-1.html), which is fixed in 11.6.0.

     

    ID 424931 - Upon the creation of a large file, such as a UCS archive, csyncd can raise the CPU utilization of a system for an extended period of time. Create a large file in a directory monitored by csyncd (see /etc/csyncd.conf). Increased CPU utilization can lead to system instability. Workaround: None.

     

    • shaggy's avatar
      shaggy
      Icon for Nimbostratus rankNimbostratus
      If the high CPU is negatively impacting traffic, you can download the UCS off-box and delete it from the F5 (or move it from /var/local/ucs to /shared/tmp)