Symbol: zpool_vdev_degrade
usr/src/cmd/fm/modules/common/zfs-retire/zfs_retire.c
618
(void) zpool_vdev_degrade(zhp, vdev_guid, aux);
usr/src/lib/libzfs/common/libzfs.h
310
extern int zpool_vdev_degrade(zpool_handle_t *, uint64_t, vdev_aux_t);