Introduction
VMware HCX is a great tool, which simplifies VM migrations between on-prem to on-prem or on-prem to cloud at scale. I’ve worked with many different VM migration tools before and what I particularly like about HCX is it’s ability to stretch network subnets between source and destination environments. It reduces (or completely removes) the need to re-IP VMs, which simplifies the migration and reduces the risk of inadvertently introducing issues into migrated applications.
Perftest Tool
HCX is a complex set of technologies and getting initial deployment right is key to building a reliable migration fabric. Perftest is a CLI tool available on interconnect (IX) and network extension (NE) HCX appliances, which allows you to perform validation testing to ensure everything is functioning correctly, as well as provide you a performance baseline. To run this tool you will need to SSH into HCX Manager, enter CCLI and then go to one of your IX or NE appliances:
# ccli# list# go 0# perftest all
Issue Description
There is one issue you can come across, when running perftest, where it partially completes with the following errors:
Message Error: map[string]interface {}{“grpc_code”:14, “http_code”:503, “http_status”:”Service Unavailable”, “message”:”rpc error: code = Unavailable desc = transport is closing”}
and
Internal failure happens. Err: http.Post(https://appliance_ip:9443/perftest/stoptest) return statusCode: 503
Solution
The reason for this error is blocked connectivity on port TCP/4500. HCX uses ports UDP/4500 and UDP/500 for establishing tunnels between IX and NE appliance pairs, but that’s not enough for perftest.
In the very beginning of the perftest it gives you a hint, but it’s easy to overlook. This requirement is not well documented (at least at the time of writing), so keep that in mind next time you deploy HCX.
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