Adds a functional test for parallel imports.

This test confirms that the imports occur in parallel.

Signed-off-by: Don Brady <don.brady@klarasystems.com>

tests/runfiles/common.run

@@ -426,7 +426,7 @@ tests = ['zpool_import_001_pos', 'zpool_import_002_pos',
     'import_paths_changed',
     'import_rewind_config_changed',
     'import_rewind_device_replaced',
-    'zpool_import_status']
+    'zpool_import_status', 'zpool_import_parallel']
 tags = ['functional', 'cli_root', 'zpool_import']
 timeout = 1200
 

tests/zfs-tests/tests/Makefile.am

@@ -1116,6 +1116,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/cli_root/zpool_import/zpool_import_missing_003_pos.ksh \
 	functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh \
 	functional/cli_root/zpool_import/zpool_import_status.ksh \
+	functional/cli_root/zpool_import/zpool_import_parallel.ksh \
 	functional/cli_root/zpool_initialize/cleanup.ksh \
 	functional/cli_root/zpool_initialize/zpool_initialize_attach_detach_add_remove.ksh \
 	functional/cli_root/zpool_initialize/zpool_initialize_fault_export_import_online.ksh \

tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_parallel.ksh

@@ -0,0 +1,148 @@
+#!/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 https://opensource.org/licenses/CDDL-1.0.
+# 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 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2023 Klara, Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zpool_import/zpool_import.cfg
+. $STF_SUITE/tests/functional/cli_root/zpool_import/zpool_import.kshlib
+
+# test uses 8 vdevs
+export MAX_NUM=8
+
+
+#
+# DESCRIPTION:
+# 	Verify that pool imports can occur in parallel
+#
+# STRATEGY:
+#	1. Create 8 pools
+#	2. Generate some ZIL records
+#	3. Export the pools
+#	4. Import half of the pools synchronously to baseline sequential cost
+#	5. Import the other half asynchronously to demonstrate parallel savings
+#
+
+verify_runnable "global"
+
+#
+# override the minimum sized vdevs
+#
+VDEVSIZE=$((512 * 1024 * 1024))
+increase_device_sizes $VDEVSIZE
+
+POOLNAME="import_pool"
+
+function cleanup
+{
+	log_must set_tunable64 KEEP_LOG_SPACEMAPS_AT_EXPORT 0
+	log_must set_tunable64 METASLAB_DEBUG_LOAD 0
+
+	for i in {0..$(($MAX_NUM - 1))}; do
+		destroy_pool $POOLNAME-$i
+	done
+	# restore the device sizes
+	increase_device_sizes $FILE_SIZE
+}
+
+log_assert "Pool imports can occur in parallel"
+
+log_onexit cleanup
+
+log_must set_tunable64 KEEP_LOG_SPACEMAPS_AT_EXPORT 1
+log_must set_tunable64 METASLAB_DEBUG_LOAD 1
+
+function create_dirty_pool
+{
+	typeset pool=$1
+	typeset vdev=$2
+
+	log_must zpool create $pool $vdev
+	log_must zfs create -o recordsize=8k $pool/fs
+
+	#
+	# This dd command works around an issue where ZIL records aren't created
+	# after freezing the pool unless a ZIL header already exists. Create a file
+	# synchronously to force ZFS to write one out.
+	#
+	log_must dd if=/dev/zero of=/$pool/fs/sync conv=fsync bs=1 count=1
+
+	#
+	# Freeze the pool to retain the intent log records
+	#
+	log_must zpool freeze $pool
+
+	# fill_fs [destdir] [dirnum] [filenum] [bytes] [num_writes] [data]
+	log_must fill_fs /$pool/fs 1 750 100 1000 Z
+
+	log_must zpool list -v $pool
+
+	#
+	# Unmount filesystem and export the pool
+	#
+	# The zfs intent logs contain records to replay.
+	#
+	log_must zfs unmount /$pool/fs
+	log_must zpool export $pool
+}
+
+#
+# create some dirty (non-empty ZIL) exported pools
+#
+SECONDS=0
+for i in {0..$(($MAX_NUM - 1))}; do
+	log_must create_dirty_pool $POOLNAME-$i $DEVICE_DIR/${DEVICE_FILE}$i &
+done
+wait
+log_note "created $MAX_NUM dirty pools in $SECONDS seconds"
+
+#
+# import half of the pools synchronously
+#
+SECONDS=0
+for i in {0..3}; do
+	log_must zpool import -d $DEVICE_DIR -f $POOLNAME-$i
+done
+sequential_time=$SECONDS
+log_note "sequentially imported 4 pools in $sequential_time seconds"
+
+#
+# import half of the pools in parallel
+#
+SECONDS=0
+for i in {4..7}; do
+	log_must zpool import -d $DEVICE_DIR -f $POOLNAME-$i &
+done
+wait
+parallel_time=$SECONDS
+log_note "asyncronously imported 4 pools in $parallel_time seconds"
+
+log_must test $parallel_time -lt $(($sequential_time / 3))
+
+log_pass "Pool imports occur in parallel"