So it turns out this is because of a lack of fallocate() when using musl on zfs. This patch to the raft library solved the issue for me (fixed in v0.9.19). https://github.com/canonical/raft/commit/073aeaeed936a076c4bf99814c209bcf85c1df53 Likely the next release of LXD -- Daniel Gray (dng) 0x41911F722B0F9AE3