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Forum Discussion

johnniebegood_1's avatar
johnniebegood_1
Icon for Nimbostratus rankNimbostratus
Feb 27, 2014

Cpu load high ltm version BIG-IP 11.3.0 3144.0 Hotfix HF8

Hello,   Could someone please guide me in this situation. I manage 2 ltm's which i have upgraded from BIG-IP 10.2.4 655.0 Hotfix HF4 to BIG-IP 11.3.0 3144.0 Hotfix HF8   F5 Model:BIG-IP 6900  ...
application delivery
citrix
cloud
LTM
management
oracle
vmware
Chris_Akker_129's avatar
Chris_Akker_129
Historic F5 Account
Feb 27, 2014

Hi Johnnie, you could try "bigtop" from the commandline, but if you are truly maxing out the CPU, it could roll the box, too. So I'd be careful with using that during production.

 

Getting F5 support involved is probably the quickest route to resolution.

 

I have seen SNAT pool exhaustion cause high cpu load, so if you are using one-armed load balanciing, or doing SNAT on a lot of virtual servers, you could be running out of the tcp ports used for SNAT. Check the /var/log/ltm log file for "Inet port exhaustion" type messages. If you see those, add more Self-IPs to a SNAT pool, and use the SNAT pool instead of "automap".

 

Hopefully you installed V11.3 on a new volume. If so, I'd consider a rollback to 10.2.4 at your earliest convenience.

 

Good Luck !!

 

Chris