Guess what one of the top disk latency inducers is on my (functionally mostly idle) server.

# zfsslower
Tracing ZFS operations slower than 10 ms
TIME     COMM           PID     T BYTES   OFF_KB   LAT(ms) FILENAME
09:14:10 async_49       2675004 S 0       0          18.29 journal.jif

The mysteriously named async_49 represents Mnesia as used by RabbitMQ as part of… Zulip.

Have I mentioned that a Zulip instance hosting 3 users is a waste of resources? Oh, I have, haven’t I?