DOKK / manpages / debian 12 / zfsutils-linux / zvol_wait.1.en
ZVOL_WAIT(1) General Commands Manual ZVOL_WAIT(1)

zvol_waitwait for ZFS volume links to appear in /dev

zvol_wait

When a ZFS pool is imported, the volumes within it will appear as block devices. As they're registered, udev(7) asynchronously creates symlinks under /dev/zvol using the volumes' names. zvol_wait will wait for all those symlinks to be created before exiting.

udev(7)

May 27, 2021 OpenZFS