Adventures of a Small Time OpenStack Sysadmin relate the experience of converting a small VMware cluster into two small OpenStack clusters, and the adventures and friends I made along the way.
Adventures of a Small Time OpenStack Sysadmin Chapter 030 - Decommission ESXi hosts 4, 5, 6
This is somewhat repetitive of Chapter 008 where I decommissioned hosts 1, 2 and 3.
https://springcitysolutions.blogspot.com/2022/07/adventures-of-small-time-openstack_01472243191.html
The main process improvement I applied was to very carefully inspect each ethernet cable to make sure they are labeled properly and plugged into the correct ports.
It was a strange feeling shutting down vCenter for the last time. I've had a vCenter installation since at least the v5 era. There were occasional issues, upgrades "resolved" by reinstalling vCenter, etc. But overall it was a bittersweet moment to flip the switch.
The power supply for server os4 blew up on July 10th. I distinctly remember scanning it and the rest of os4 with my thermal camera mere weeks before and no unusual heating patterns were seen. Sometimes its just a capacitor's time to go. My records show I've now replaced 60% of the E200 series SuperMicro power supplies, they only last a couple years and fail dead no output. Aftermarket replacements have never failed... so far. I use Observium for monitoring and it can graph various SNMP IPMI parameters automatically, including incoming 12 volts from the external power supply, which was rock steady, right until it failed. Monitoring and keeping good records sometimes helps, sometimes does not. After the first couple supplies burned out, I keep a stock of aftermarket replacements on hand so repair only takes five minutes.
Tomorrow we prep the hosts for OpenStack Cluster 2.0.
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