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ZFS
When using ZFS, /etc/zfs/zpool.cache should be persistent (or a symlink to a persistent
location) as it is the default value for the cachefile property.
This cachefile is used on system startup to discover ZFS pools, so ZFS pools
holding the rootfs and/or early-boot datasets such as /nix can be set to
cachefile=none.
In principle, if there are no other pools attached to the system, zpool.cache
does not need to be persisted; it is however strongly recommended to persist
it, in case additional pools are added later on, temporarily or permanently:
While mishandling the cachefile does not lead to data loss by itself, it may cause zpools not to be imported during boot, and services may then write to a location where a dataset was expected to be mounted.