The migration will be happening tomorrow, starting around 11:00 UTC
services will stay online during most of the migration, but expect performance to be affected (main reason for this migration was existing IO bottlenecks)
During the postgres move at the end of the migration, Synapse and Mastodon will both be down. moving around 33Gb of data from hdd to ssd
then a reboot to make sure everything is reboot-proof. If everything goes well actual downtime should be very limited