diff --git a/tools/regression/geom_raid3/Makefile b/tools/regression/geom_raid3/Makefile
new file mode 100644
index 000000000000..9eb76c66ffaa
--- /dev/null
+++ b/tools/regression/geom_raid3/Makefile
@@ -0,0 +1,8 @@
+#
+# $FreeBSD$
+#
+# Regression tests for geom_raid3.
+#
+
+test:
+	@sh runtests.sh
diff --git a/tools/regression/geom_raid3/runtests.sh b/tools/regression/geom_raid3/runtests.sh
new file mode 100644
index 000000000000..b22c1ff924be
--- /dev/null
+++ b/tools/regression/geom_raid3/runtests.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# $FreeBSD$
+
+dir=`dirname $0`
+
+graid3 load >/dev/null 2>&1
+for ts in `dirname $0`/test-*.sh; do
+	sh $ts
+done
+graid3 unload
diff --git a/tools/regression/geom_raid3/test-1.sh b/tools/regression/geom_raid3/test-1.sh
new file mode 100644
index 000000000000..7c116ad4686a
--- /dev/null
+++ b/tools/regression/geom_raid3/test-1.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+
+mdconfig -a -t malloc -s 1M -u $us0 || exit 1
+mdconfig -a -t malloc -s 2M -u $us1 || exit 1
+mdconfig -a -t malloc -s 3M -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+# Size of created device should be 1MB - 512b.
+
+mediasize=`diskinfo /dev/raid3/${name} | awk '{print $3}'`
+if [ $mediasize -eq 2096128 ]; then
+	echo "PASS"
+else
+	echo "FAIL"
+fi
+sectorsize=`diskinfo /dev/raid3/${name} | awk '{print $2}'`
+if [ $sectorsize -eq 1024 ]; then
+	echo "PASS"
+else
+	echo "FAIL"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
diff --git a/tools/regression/geom_raid3/test-2.sh b/tools/regression/geom_raid3/test-2.sh
new file mode 100644
index 000000000000..49a7de006529
--- /dev/null
+++ b/tools/regression/geom_raid3/test-2.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-3.sh b/tools/regression/geom_raid3/test-3.sh
new file mode 100644
index 000000000000..d6765903b9d8
--- /dev/null
+++ b/tools/regression/geom_raid3/test-3.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+#
+# Reading without one DATA component (so with parity).
+#
+graid3 remove -n 1 $name
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-4.sh b/tools/regression/geom_raid3/test-4.sh
new file mode 100644
index 000000000000..19eed35a7bae
--- /dev/null
+++ b/tools/regression/geom_raid3/test-4.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+#
+# Writing without one DATA component.
+#
+graid3 remove -n 1 $name
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-5.sh b/tools/regression/geom_raid3/test-5.sh
new file mode 100644
index 000000000000..5de21960debe
--- /dev/null
+++ b/tools/regression/geom_raid3/test-5.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+#
+# Writing without PARITY component.
+#
+graid3 remove -n 2 $name
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-6.sh b/tools/regression/geom_raid3/test-6.sh
new file mode 100644
index 000000000000..778f38fd58a6
--- /dev/null
+++ b/tools/regression/geom_raid3/test-6.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+#
+# Rebuild of DATA component.
+#
+graid3 remove -n 1 $name
+dd if=/dev/zero of=/dev/md${us1} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+graid3 insert -n 1 $name md${us1}
+sleep 1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-7.sh b/tools/regression/geom_raid3/test-7.sh
new file mode 100644
index 000000000000..b39de20da437
--- /dev/null
+++ b/tools/regression/geom_raid3/test-7.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+#
+# Rebuild of PARITY component.
+#
+graid3 remove -n 2 $name
+dd if=/dev/zero of=/dev/md${us2} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+graid3 insert -n 2 $name md${us2}
+sleep 1
+# Remove DATA component, so PARITY component can be used while reading.
+graid3 remove -n 1 $name
+dd if=/dev/zero of=/dev/md${us1} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-8.sh b/tools/regression/geom_raid3/test-8.sh
new file mode 100644
index 000000000000..ea319686418b
--- /dev/null
+++ b/tools/regression/geom_raid3/test-8.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+#
+# Writing without DATA component and rebuild of DATA component.
+#
+graid3 remove -n 1 $name
+dd if=/dev/zero of=/dev/md${us1} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+graid3 insert -n 1 $name md${us1}
+sleep 1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}
diff --git a/tools/regression/geom_raid3/test-9.sh b/tools/regression/geom_raid3/test-9.sh
new file mode 100644
index 000000000000..eeb5429956ce
--- /dev/null
+++ b/tools/regression/geom_raid3/test-9.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+# $FreeBSD$
+
+name="test"
+base=`basename $0`
+us0=45
+us1=`expr $us0 + 1`
+us2=`expr $us0 + 2`
+ddbs=2048
+nblocks1=1024
+nblocks2=`expr $nblocks1 / \( $ddbs / 512 \)`
+src=`mktemp /tmp/$base.XXXXXX` || exit 1
+dst=`mktemp /tmp/$base.XXXXXX` || exit 1
+
+dd if=/dev/random of=${src} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us0 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us1 || exit 1
+mdconfig -a -t malloc -s `expr $nblocks1 + 1` -u $us2 || exit 1
+
+graid3 label $name /dev/md${us0} /dev/md${us1} /dev/md${us2} || exit 1
+
+#
+# Writing without PARITY component and rebuild of PARITY component.
+#
+graid3 remove -n 2 $name
+dd if=/dev/zero of=/dev/md${us2} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+dd if=${src} of=/dev/raid3/${name} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+graid3 insert -n 2 $name md${us2}
+sleep 1
+# Remove DATA component, so PARITY component can be used while reading.
+graid3 remove -n 1 $name
+dd if=/dev/zero of=/dev/md${us1} bs=512 count=`expr $nblocks1 + 1` >/dev/null 2>&1
+
+dd if=/dev/raid3/${name} of=${dst} bs=$ddbs count=$nblocks2 >/dev/null 2>&1
+if [ `md5 -q ${src}` != `md5 -q ${dst}` ]; then
+	echo "FAIL"
+else
+	echo "PASS"
+fi
+
+graid3 stop $name
+mdconfig -d -u $us0
+mdconfig -d -u $us1
+mdconfig -d -u $us2
+rm -f ${src} ${dst}