Replace -ms-be0 (@fgiunchedi) with smaller (maybe medium) instances? Both XLARGE! (note: these are both using about 5G of 100G space for Swift, though do seem to have quite a bit of activity)
 Replace -logstash2 (@bd808) with a large instance? XLARGE!
 Replace -tin with a large instance? XLARGE! (note: mira is large)
 Delete a -mediawiki? We have three, all large!
 Replace -fluorine with a custom small/medium flavour with a large disk size? It's large.
 Delete one or two -elastic (@demon)? There are four of these, all large!
[*] Delete one or two -parsoid (@Catrope, @ssastry, @mobrovac)? There are four of these, all medium.
 Delete -pdf02 (@jeremyb, @cscott)? only -pdf01 seems used according to MW config (medium)
[*] What about merging -changeprop (@mobrovac) into -sca0[1-3]?
[*] What about merging -ores-redis (@ladsgroup) into -redis0?
 Delete -conf03 (@ottomata), -conftool (@joe)?
 Delete one or two -kafka (@ottomata)? There are four of these
 @mmodell, are you using phab-beta?