'Edge CPU Usage Very High' alarm seen on the NSX
Article ID: 412833
Updated On:
Products
VMware NSX
Issue/Introduction
- High CPU alert seen on the NSX UI for the Edge Node
- High I/O Wait seen on the top-cpu output of the NSX edge (/var/log/vmware/top-cpu.log)
-
Tue Sep 29 23:50:24 UTC 2025
top - 01:47:27 up 121 days, 13:00, 0 users, load average: 25.96, 22.40, 12.55
Tasks: 242 total, 1 running, 241 sleeping, 0 stopped, 0 zombie
%Cpu(s): 3.2 us, 2.8 sy, 0.0 ni, 24.2 id, 69.7 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 7843656 total, 184784 free, 5240724 used, 2418148 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 2540388 avail Mem
-
- na (I/O Wait) is the percentage of CPU time spent waiting for I/O operations
- On the associated ESXi Host where the NSX Edge resides, below similar logs related to increased IO latency will be seen on the vmkernel.log
-
2025-09-29T23:25:19.125Z cpu75:2098274)WARNING: ScsiDeviceIO: 1513: Device naa.<datastore-id> performance has deteriorated. I/O latency increased from average value of 1566 microseconds to 88434 microseconds.
-
Environment
VMware NSX-T Data Center
VMware NSX
Cause
Due to High I/O Wait (wa). The percentage of CPU time spent waiting for input/output operations
Resolution
- This is not an NSX issue
- Check with Datastore or Storage for issues contributing in high I/O operations.
Additional Information
Feedback
Yes
No
Powered by
