So the chassis fan for the Lenovo M700 small form factor PC I'd been using for the last 3 years started failing a day or two ago. I'm working currently to migrate the data to another machine and get back up and running, but I have to use a SATA-to-USB connector and it's taking some time. My best guess is the copying of data should be done in the next 5-6 hours, then the node will need to catch up and resync. 
Hoping everything will be back up in the next 12 hours. 
Praying my channels are fine.

April 25 Update: Migration complete.

April 26 Update: The migration was successful but I underestimated the IOPS bottleneck of my NAS drives vs an SSD. I'm replicating the data to an SSD pool now. Should only be a few hours before I'm ready to boot it back up.