I company I worked at was expanding their datacenter--not the physical space, because they had/have plenty of room. No, they needed more clusters, so they bought 13 more 70-node clusters from their vendor.
Their cooling system couldn't handle it as I began turning them on. They couldn't get any more big chillers that quickly, so they ended up renting a "portable" chiller for several months, just to keep this (very large) data center semi-cool.
Reminds me of the time our data center overheated at a company I worked for. Everything shut down now. No warning, nothing.
Of course, the datacenter overheated after hours. Yours truly was on call.
The company was too cheap to install temperature sensors and alarms.
After the data center was down for over 24 hours, the company decided to spend a few dollars on appropriate monitoring and alarms.
Not only that, but the company had also fired the company that maintained and monitored our mainframe shortly before the disaster.
$200 million a year company and they wouldn’t spend a few thousand to maintain data integrity.
I left as soon as I could. I got tired of dealing with that kind of crap.
Forgot to add, I warned the company there were issues with various system, but they wouldn’t listen.
I got tired of getting blamed for stuff I’d warned them about.