+run_test 16a "$FSXNUM iterations of dual-mount fsx"
+
+# Consistency check for tiny writes, LU-9409
+test_16b() {
+ local file1=$DIR1/$tfile
+ local file2=$DIR2/$tfile
+
+ # to allocate grant because it may run out due to test_15.
+ lfs setstripe -c -1 $file1
+ dd if=/dev/zero of=$file1 bs=$STRIPE_BYTES count=$OSTCOUNT oflag=sync
+ dd if=/dev/zero of=$file2 bs=$STRIPE_BYTES count=$OSTCOUNT oflag=sync
+ rm -f $file1
+
+ lfs setstripe -c -1 $file1 # b=10919
+ # -o is set to 8192 because writes < 1 page and between 1 and 2 pages
+ # create a mix of tiny writes & normal writes
+ fsx -c 50 -p $FSXP -N $FSXNUM -l $((SIZE * 256)) -o 8192 -S 0 $file1 \
+ $file2
+}
+run_test 16b "$FSXNUM iterations of dual-mount fsx at small size"
+
+test_16c() {
+ local file1=$DIR1/$tfile
+ local file2=$DIR2/$tfile
+ local stripe_size=$(do_facet $SINGLEMDS \
+ "$LCTL get_param -n lod.$(facet_svc $SINGLEMDS)*.stripesize")
+
+ [ $(facet_fstype ost1) != ldiskfs ] && skip "dio on ldiskfs only"
+
+ # to allocate grant because it may run out due to test_15.
+ $LFS setstripe -c -1 $file1
+ dd if=/dev/zero of=$file1 bs=$stripe_size count=$OSTCOUNT oflag=sync
+ dd if=/dev/zero of=$file2 bs=$stripe_size count=$OSTCOUNT oflag=sync
+ rm -f $file1
+ wait_delete_completed
+
+ local list=$(comma_list $(osts_nodes))
+ if ! get_osd_param $list '' read_cache_enable >/dev/null; then
+ skip "not cache-capable obdfilter"
+ fi
+
+ set_osd_param $list '' read_cache_enable 0
+ set_osd_param $list '' writethrough_cache_enable 0
+
+ $LFS setstripe -c -1 $file1 # b=10919
+ fsx -c 50 -p $FSXP -N $FSXNUM -l $((SIZE * 256)) -S 0 $file1 $file2 \
+ || error "fsx failed"
+ rm -f $file1
+
+ set_osd_param $list '' read_cache_enable 1
+ set_osd_param $list '' writethrough_cache_enable 1
+
+ return 0
+}
+run_test 16c "verify data consistency on ldiskfs with cache disabled (b=17397)"
+