mkfs_opts="-d raid1 -b 1G"
_scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
-# -o nospace_cache makes sure data is written to the start position of the data
-# chunk
-_scratch_mount -o nospace_cache
+# make sure data is written to the start position of the data chunk
+_scratch_mount $(_btrfs_no_v1_cache_opt)
$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" |\
_filter_xfs_io_offset