The zfs module seems to be missing in the referenced kernel/modules thus the zfs pool is missing and the DB fails to start
# systemctl --failed UNIT LOAD ACTIVE SUB DESCRIPTION ● mariadb.service loaded failed failed MariaDB 10.11.8 database server Legend: LOAD → Reflects whether the unit definition was properly loaded. ACTIVE → The high-level unit activation state, i.e. generalization of SUB. SUB → The low-level unit activation state, values depend on unit type. 1 loaded units listed. # zpool status The ZFS modules cannot be auto-loaded. Try running 'modprobe zfs' as root to manually load them. root@db1-gra5-old:/home/todor# modprobe zfs modprobe: FATAL: Module zfs not found in directory /lib/modules/6.5.0-060500-generic # find /lib/modules/6.5.0-060500-generic/ -iname "*zfs*" # find /lib/modules/ -iname "*zfs*" /lib/modules/6.8.0-51-generic/kernel/zfs /lib/modules/6.8.0-51-generic/kernel/zfs/zfs.ko.zst /lib/modules/6.8.0-52-generic/kernel/zfs /lib/modules/6.8.0-52-generic/kernel/zfs/zfs.ko.zst -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2098375 Title: ZFS pool randomly encounters error condition and hangs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098375/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs