NVME_DSET_MGMT_MAX_RANGES
CTASSERT(sizeof (nvme_range_t) * NVME_DSET_MGMT_MAX_RANGES == 4096);
VERIFY3U(dfl->dfl_num_exts, <=, NVME_DSET_MGMT_MAX_RANGES);
drive->d_max_free_seg = NVME_DSET_MGMT_MAX_RANGES;