It is, I believe, 96% full in the spacemap for it to resort to best-fit instead of first-fit. [1] [1] - https://github.com/openzfs/zfs/blob/eaaed26ffb3a14c0c98

It is, I believe, 96% full in the spacemap for it to resort to best-fit instead of first-fit. [1] [1] - https://github.com/openzfs/zfs/blob/eaaed26ffb3a14c0c98ce1e6e039e62327ab4447/module/zfs/metaslab.c#L166-L172 https://github.com/openzfs/zfs/blob/eaaed26ffb3a14c0c98ce1e6...