There was a fail event reported on rosemary from one side of a pair of 60GB SSDs, which hold Rosemary_Data. Typical of my installations this mirror set holds the stuff the system needs beyond the os install: /home, databases, certificates, repositories, mail, samba, local bin, etc. Its a mirror set with an encrypted container, containing a btrfs filesystem. The older versions of these setups contain separate btrfs subvolumes for the different directories, newer ones have only one subvolume for that, and another for snaps. This is an old one.

Rosemary doesn’t have an extensive set of services – really only the /home and the databases. No real need for much of anything else. The local bin comes out of the repo anyway, there is no mail, no repository, no certs. However, without that volume the system won’t come up in a usable way. So lesson one learned here was when you get a fail event, attend to it. I let it go for a few days, because I knew I was going to have to pull the case out of the rack mount to get at the SSDs.