Among my research tricks: look for mentions of works in course syllabi which refer to the work(s) you've found, and see what else surfaces.

The Datacenter as Computer appears in the CS293B papers collection at UCSB

Syllabus: https://sites.cs.ucsb.edu/~rich/class/cs293b-cloud/

Assigned papers: https://sites.cs.ucsb.edu/~rich/class/cs293b-cloud/papers/

Further searches:

edu (US) https://duckduckgo.com/?q=%22The+Datacenter+as+a+Computer%22...

ac.uk (UK) https://duckduckgo.com/?q=%22The+Datacenter+as+a+Computer%22...

waterloo (CA) https://duckduckgo.com/?q=%22The+Datacenter+as+a+Computer%22...

mcgill (CA) https://duckduckgo.com/?q=%22The+Datacenter+as+a+Computer%22...