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by threeseed 1190 days ago
Not sure if it's still the case but last time I had co-located servers you could access the systems via OOB without needing to reboot them in single user mode.

If it's not the case then Twitter is definitely in far more trouble because according to past engineers at least a few of their services needed manual intervention on a full scale reboot. And losing quorum in a distributed system is never pretty.