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diff --git a/sys/contrib/openzfs/module/zfs/vdev_raidz.c b/sys/contrib/openzfs/module/zfs/vdev_raidz.c
--- a/sys/contrib/openzfs/module/zfs/vdev_raidz.c
+++ b/sys/contrib/openzfs/module/zfs/vdev_raidz.c
@@ -1922,16 +1922,6 @@
if (checksum == ZIO_CHECKSUM_NOPARITY)
return (ret);
- /*
- * All data columns must have been successfully read in order
- * to use them to generate parity columns for comparison.
- */
- for (c = rr->rr_firstdatacol; c < rr->rr_cols; c++) {
- rc = &rr->rr_col[c];
- if (!rc->rc_tried || rc->rc_error != 0)
- return (ret);
- }
-
for (c = 0; c < rr->rr_firstdatacol; c++) {
rc = &rr->rr_col[c];
if (!rc->rc_tried || rc->rc_error != 0)
diff --git a/sys/contrib/openzfs/tests/runfiles/common.run b/sys/contrib/openzfs/tests/runfiles/common.run
--- a/sys/contrib/openzfs/tests/runfiles/common.run
+++ b/sys/contrib/openzfs/tests/runfiles/common.run
@@ -727,8 +727,9 @@
[tests/functional/redundancy]
tests = ['redundancy_draid1', 'redundancy_draid2', 'redundancy_draid3',
'redundancy_draid_spare1', 'redundancy_draid_spare2',
- 'redundancy_draid_spare3', 'redundancy_mirror', 'redundancy_raidz1',
- 'redundancy_raidz2', 'redundancy_raidz3', 'redundancy_stripe']
+ 'redundancy_draid_spare3', 'redundancy_mirror', 'redundancy_raidz',
+ 'redundancy_raidz1', 'redundancy_raidz2', 'redundancy_raidz3',
+ 'redundancy_stripe']
tags = ['functional', 'redundancy']
[tests/functional/refquota]
diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/Makefile.am b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/Makefile.am
--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/Makefile.am
+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/Makefile.am
@@ -9,6 +9,7 @@
redundancy_draid_spare2.ksh \
redundancy_draid_spare3.ksh \
redundancy_mirror.ksh \
+ redundancy_raidz.ksh \
redundancy_raidz1.ksh \
redundancy_raidz2.ksh \
redundancy_raidz3.ksh \
diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh
new file mode 100644
--- /dev/null
+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh
@@ -0,0 +1,198 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2020 by vStack. All rights reserved.
+# Copyright (c) 2021 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/redundancy/redundancy.kshlib
+
+#
+# DESCRIPTION:
+# RAIDZ should provide redundancy
+#
+# STRATEGY:
+# 1. Create block device files for the test raidz pool
+# 2. For each parity value [1..3]
+# - create raidz pool
+# - fill it with some directories/files
+# - verify resilver by replacing devices
+# - verify scrub by zeroing devices
+# - destroy the raidz pool
+
+typeset -r devs=6
+typeset -r dev_size_mb=512
+
+typeset -a disks
+
+prefetch_disable=$(get_tunable PREFETCH_DISABLE)
+
+function cleanup
+{
+ poolexists "$TESTPOOL" && destroy_pool "$TESTPOOL"
+
+ for i in {0..$devs}; do
+ rm -f "$TEST_BASE_DIR/dev-$i"
+ done
+
+ set_tunable32 PREFETCH_DISABLE $prefetch_disable
+}
+
+function test_resilver # <pool> <parity> <dir>
+{
+ typeset pool=$1
+ typeset nparity=$2
+ typeset dir=$3
+
+ for (( i=0; i<$nparity; i=i+1 )); do
+ log_must zpool offline $pool $dir/dev-$i
+ done
+
+ log_must zpool export $pool
+
+ for (( i=0; i<$nparity; i=i+1 )); do
+ log_must zpool labelclear -f $dir/dev-$i
+ done
+
+ log_must zpool import -o cachefile=none -d $dir $pool
+
+ for (( i=0; i<$nparity; i=i+1 )); do
+ log_must zpool replace -fw $pool $dir/dev-$i
+ done
+
+ log_must check_pool_status $pool "errors" "No known data errors"
+ resilver_cksum=$(cksum_pool $pool)
+ if [[ $resilver_cksum != 0 ]]; then
+ log_must zpool status -v $pool
+ log_fail "resilver cksum errors: $resilver_cksum"
+ fi
+
+ log_must zpool clear $pool
+
+ for (( i=$nparity; i<$nparity*2; i=i+1 )); do
+ log_must zpool offline $pool $dir/dev-$i
+ done
+
+ log_must zpool export $pool
+
+ for (( i=$nparity; i<$nparity*2; i=i+1 )); do
+ log_must zpool labelclear -f $dir/dev-$i
+ done
+
+ log_must zpool import -o cachefile=none -d $dir $pool
+
+ for (( i=$nparity; i<$nparity*2; i=i+1 )); do
+ log_must zpool replace -fw $pool $dir/dev-$i
+ done
+
+ log_must check_pool_status $pool "errors" "No known data errors"
+ resilver_cksum=$(cksum_pool $pool)
+ if [[ $resilver_cksum != 0 ]]; then
+ log_must zpool status -v $pool
+ log_fail "resilver cksum errors: $resilver_cksum"
+ fi
+
+ log_must zpool clear $pool
+}
+
+function test_scrub # <pool> <parity> <dir>
+{
+ typeset pool=$1
+ typeset nparity=$2
+ typeset dir=$3
+ typeset combrec=$4
+
+ log_must zpool export $pool
+
+ for (( i=0; i<$nparity; i=i+1 )); do
+ dd conv=notrunc if=/dev/zero of=$dir/dev-$i \
+ bs=1M seek=4 count=$(($dev_size_mb-4))
+ done
+
+ log_must zpool import -o cachefile=none -d $dir $pool
+
+ log_must zpool scrub -w $pool
+ log_must check_pool_status $pool "errors" "No known data errors"
+
+ log_must zpool clear $pool
+
+ log_must zpool export $pool
+
+ for (( i=$nparity; i<$nparity*2; i=i+1 )); do
+ dd conv=notrunc if=/dev/zero of=$dir/dev-$i \
+ bs=1M seek=4 count=$(($dev_size_mb-4))
+ done
+
+ log_must zpool import -o cachefile=none -d $dir $pool
+
+ log_must zpool scrub -w $pool
+ log_must check_pool_status $pool "errors" "No known data errors"
+
+ log_must zpool clear $pool
+}
+
+log_onexit cleanup
+
+log_must set_tunable32 PREFETCH_DISABLE 1
+
+# Disk files which will be used by pool
+for i in {0..$(($devs - 1))}; do
+ device=$TEST_BASE_DIR/dev-$i
+ log_must truncate -s ${dev_size_mb}M $device
+ disks[${#disks[*]}+1]=$device
+done
+
+# Disk file which will be attached
+log_must truncate -s 512M $TEST_BASE_DIR/dev-$devs
+
+for nparity in 1 2 3; do
+ raid=raidz$nparity
+ dir=$TEST_BASE_DIR
+
+ log_must zpool create -f -o cachefile=none $TESTPOOL $raid ${disks[@]}
+ log_must zfs set primarycache=metadata $TESTPOOL
+
+ log_must zfs create $TESTPOOL/fs
+ log_must fill_fs /$TESTPOOL/fs 1 512 100 1024 R
+
+ log_must zfs create -o compress=on $TESTPOOL/fs2
+ log_must fill_fs /$TESTPOOL/fs2 1 512 100 1024 R
+
+ log_must zfs create -o compress=on -o recordsize=8k $TESTPOOL/fs3
+ log_must fill_fs /$TESTPOOL/fs3 1 512 100 1024 R
+
+ typeset pool_size=$(get_pool_prop size $TESTPOOL)
+
+ log_must zpool export $TESTPOOL
+ log_must zpool import -o cachefile=none -d $dir $TESTPOOL
+
+ log_must check_pool_status $TESTPOOL "errors" "No known data errors"
+
+ test_resilver $TESTPOOL $nparity $dir
+ test_scrub $TESTPOOL $nparity $dir
+
+ log_must zpool destroy "$TESTPOOL"
+done
+
+log_pass "raidz redundancy test succeeded."

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