I have EC2 application servers behind an elastic load balancer. All of the application servers have access to a shared storage server, notably for centralized cache files, logging, etc. The shared storage server implements NFS over OpenVPN to do its job. All of the servers are in the same availability zone and talk to each other over the internal network. However, the shared storage solution is leading to abnormally high CPU and latency that does not typically exist if storage is 100% local. Slight performance decreases with this setup are expected, but in this case CPU has gone up & output has slowed down by 2-3x
So, this is a 2 part question:
What can I do to better understand what the culprit is? I know it's the combination of OpenVPN & NFS, but can I identify the specific files being read & written to the most? Or can I easily tell where the bottleneck is?
Does anybody have advice based purely on the information above? Is there a better way to share files cross-server in a cloud-based environment? (Please don't respond with "use S3", as that is not a good fit for instant/temporary file requirements)
Thanks!
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