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Add slow disk diagnosis to ZED
Slow disk response times can be indicative of a failing drive. ZFS currently tracks slow I/Os (slower than zio_slow_io_ms) and generates events (ereport.fs.zfs.delay). However, no action is taken by ZED, like is done for checksum or I/O errors. This change adds slow disk diagnosis to ZED which is opt-in using new VDEV properties: VDEV_PROP_SLOW_IO_N VDEV_PROP_SLOW_IO_T If multiple VDEVs in a pool are undergoing slow I/Os, then it skips the zpool_vdev_degrade(). Sponsored-By: OpenDrives Inc. Sponsored-By: Klara Inc. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Co-authored-by: Rob Wing <rob.wing@klarasystems.com> Signed-off-by: Don Brady <don.brady@klarasystems.com> Closes #15469
This commit is contained in:
Don Brady
@@ -1447,6 +1447,8 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
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functional/events/zed_fd_spill.ksh \
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functional/events/zed_io_config.ksh \
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functional/events/zed_rc_filter.ksh \
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functional/events/zed_slow_io.ksh \
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functional/events/zed_slow_io_many_vdevs.ksh \
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functional/exec/cleanup.ksh \
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functional/exec/exec_001_pos.ksh \
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functional/exec/exec_002_neg.ksh \
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@@ -70,4 +70,6 @@ typeset -a properties=(
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checksum_t
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io_n
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io_t
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slow_io_n
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slow_io_t
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)
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@@ -26,8 +26,10 @@
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. $STF_SUITE/include/libtest.shlib
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zed_cleanup all-debug.sh all-syslog.sh all-dumpfds
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zed_stop
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zed_cleanup all-debug.sh all-syslog.sh all-dumpfds
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zed_events_drain
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default_cleanup
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+205
@@ -0,0 +1,205 @@
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#!/bin/ksh -p
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License (the "License").
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# You may not use this file except in compliance with the License.
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#
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# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# or https://opensource.org/licenses/CDDL-1.0.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# When distributing Covered Code, include this CDDL HEADER in each
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# If applicable, add the following below this CDDL HEADER, with the
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# fields enclosed by brackets "[]" replaced with your own identifying
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# information: Portions Copyright [yyyy] [name of copyright owner]
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#
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# CDDL HEADER END
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#
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#
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# Copyright (c) 2023, Klara Inc.
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#
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# DESCRIPTION:
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# Verify that vdev properties, slow_io_n and slow_io_t, work with ZED.
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#
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# STRATEGY:
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# 1. Create a pool with single vdev
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# 2. Set slow_io_n/slow_io_t to non-default values
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# 3. Inject slow io errors
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# 4. Verify that ZED degrades vdev
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#
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. $STF_SUITE/include/libtest.shlib
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TESTDIR="$TEST_BASE_DIR/zed_slow_io"
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VDEV="$TEST_BASE_DIR/vdevfile.$$"
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TESTPOOL="slow_io_pool"
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FILEPATH="$TESTDIR/slow_io.testfile"
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OLD_SLOW_IO=$(get_tunable ZIO_SLOW_IO_MS)
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OLD_SLOW_IO_EVENTS=$(get_tunable SLOW_IO_EVENTS_PER_SECOND)
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verify_runnable "both"
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function do_setup
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{
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log_must truncate -s 1G $VDEV
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default_setup_noexit $VDEV
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zed_events_drain
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log_must zfs set compression=off $TESTPOOL
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log_must zfs set primarycache=none $TESTPOOL
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log_must zfs set prefetch=none $TESTPOOL
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log_must zfs set recordsize=512 $TESTPOOL
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for i in {1..10}; do
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dd if=/dev/urandom of=${FILEPATH}$i bs=512 count=1 2>/dev/null
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done
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zpool sync
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}
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# intermediate cleanup
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function do_clean
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{
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log_must zinject -c all
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log_must zpool destroy $TESTPOOL
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log_must rm -f $VDEV
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}
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# final cleanup
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function cleanup
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{
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log_must zinject -c all
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# if pool still exists then something failed so log additional info
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if poolexists $TESTPOOL ; then
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log_note "$(zpool status -s $TESTPOOL)"
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echo "=================== zed log search ==================="
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grep "Diagnosis Engine" $ZEDLET_DIR/zed.log
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destroy_pool $TESTPOOL
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fi
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log_must zed_stop
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log_must rm -f $VDEV
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log_must set_tunable64 ZIO_SLOW_IO_MS $OLD_SLOW_IO
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND $OLD_SLOW_IO_EVENTS
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}
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function start_slow_io
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{
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zpool sync
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log_must set_tunable64 ZIO_SLOW_IO_MS 10
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND 1000
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log_must zinject -d $VDEV -D10:1 -T read $TESTPOOL
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zpool sync
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}
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function stop_slow_io
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{
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log_must set_tunable64 ZIO_SLOW_IO_MS $OLD_SLOW_IO
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND $OLD_SLOW_IO_EVENTS
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log_must zinject -c all
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}
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# Test default ZED settings:
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# inject 10 events over 2.5 seconds, should not degrade.
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function default_degrade
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{
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do_setup
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start_slow_io
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for i in {1..10}; do
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dd if=${FILEPATH}$i of=/dev/null count=1 bs=512 2>/dev/null
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sleep 0.25
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done
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stop_slow_io
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log_note "$(zpool status -s $TESTPOOL)"
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# give slow ZED a chance to process the delay events
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sleep 18
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log_note "$(zpool status -s $TESTPOOL)"
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degrades=$(grep "zpool_vdev_degrade" $ZEDLET_DIR/zed.log | wc -l)
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log_note $degrades vdev degrades in ZED log
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[ $degrades -eq "0" ] || \
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log_fail "expecting no degrade events, found $degrades"
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do_clean
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}
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# change slow_io_n, slow_io_t to 5 events in 60 seconds
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# fire more than 5 events, should degrade
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function slow_io_degrade
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{
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do_setup
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zpool set slow_io_n=5 $TESTPOOL $VDEV
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zpool set slow_io_t=60 $TESTPOOL $VDEV
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start_slow_io
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for i in {1..16}; do
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dd if=${FILEPATH}$i of=/dev/null count=1 bs=512 2>/dev/null
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sleep 0.5
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done
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stop_slow_io
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zpool sync
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#
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# wait up to 60 seconds for kernel to produce at least 5 delay events
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#
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typeset -i i=0
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typeset -i events=0
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while [[ $i -lt 60 ]]; do
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events=$(zpool events | grep "ereport\.fs\.zfs.delay" | wc -l)
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[[ $events -ge "5" ]] && break
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i=$((i+1))
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sleep 1
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done
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log_note "$events delay events found"
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if [[ $events -ge "5" ]]; then
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log_must wait_vdev_state $TESTPOOL $VDEV "DEGRADED" 10
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fi
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do_clean
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}
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# change slow_io_n, slow_io_t to 10 events in 1 second
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# inject events spaced 0.5 seconds apart, should not degrade
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function slow_io_no_degrade
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{
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do_setup
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zpool set slow_io_n=10 $TESTPOOL $VDEV
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zpool set slow_io_t=1 $TESTPOOL $VDEV
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start_slow_io
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for i in {1..16}; do
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dd if=${FILEPATH}$i of=/dev/null count=1 bs=512 2>/dev/null
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sleep 0.5
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done
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stop_slow_io
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zpool sync
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log_mustnot wait_vdev_state $TESTPOOL $VDEV "DEGRADED" 45
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do_clean
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}
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log_assert "Test ZED slow io configurability"
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log_onexit cleanup
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log_must zed_events_drain
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log_must zed_start
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default_degrade
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slow_io_degrade
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slow_io_no_degrade
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log_pass "Test ZED slow io configurability"
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@@ -0,0 +1,177 @@
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#!/bin/ksh -p
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License (the "License").
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# You may not use this file except in compliance with the License.
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#
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# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# or https://opensource.org/licenses/CDDL-1.0.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# When distributing Covered Code, include this CDDL HEADER in each
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# If applicable, add the following below this CDDL HEADER, with the
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# fields enclosed by brackets "[]" replaced with your own identifying
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# information: Portions Copyright [yyyy] [name of copyright owner]
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#
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# CDDL HEADER END
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#
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#
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# Copyright (c) 2023, Klara Inc.
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#
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# DESCRIPTION:
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# Verify that delay events from multiple vdevs doesnt degrade
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#
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# STRATEGY:
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# 1. Create a pool with a 3 disk raidz vdev
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# 2. Inject slow io errors
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# 3. Verify that ZED detects slow I/Os but doesn't degrade any vdevs
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#
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. $STF_SUITE/include/libtest.shlib
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TESTDIR="$TEST_BASE_DIR/zed_slow_io"
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VDEV1="$TEST_BASE_DIR/vdevfile1.$$"
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VDEV2="$TEST_BASE_DIR/vdevfile2.$$"
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VDEV3="$TEST_BASE_DIR/vdevfile3.$$"
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VDEV4="$TEST_BASE_DIR/vdevfile4.$$"
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VDEVS="$VDEV1 $VDEV2 $VDEV3 $VDEV4"
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TESTPOOL="slow_io_pool"
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FILEPATH="$TESTDIR/slow_io.testfile"
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OLD_SLOW_IO=$(get_tunable ZIO_SLOW_IO_MS)
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OLD_SLOW_IO_EVENTS=$(get_tunable SLOW_IO_EVENTS_PER_SECOND)
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verify_runnable "both"
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function cleanup
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{
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log_must zinject -c all
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# if pool still exists then something failed so log additional info
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if poolexists $TESTPOOL ; then
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log_note "$(zpool status -s $TESTPOOL)"
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echo "=================== zed log search ==================="
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grep "Diagnosis Engine" $ZEDLET_DIR/zed.log
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destroy_pool $TESTPOOL
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fi
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log_must zed_stop
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log_must rm -f $VDEVS
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log_must set_tunable64 ZIO_SLOW_IO_MS $OLD_SLOW_IO
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND $OLD_SLOW_IO_EVENTS
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}
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function start_slow_io
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{
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for vdev in $VDEVS
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do
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log_must zpool set slow_io_n=4 $TESTPOOL $vdev
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log_must zpool set slow_io_t=60 $TESTPOOL $vdev
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done
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zpool sync
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log_must set_tunable64 ZIO_SLOW_IO_MS 10
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND 1000
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for vdev in $VDEVS
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do
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log_must zinject -d $vdev -D10:1 $TESTPOOL
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done
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zpool sync
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}
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function stop_slow_io
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{
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log_must set_tunable64 ZIO_SLOW_IO_MS $OLD_SLOW_IO
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log_must set_tunable64 SLOW_IO_EVENTS_PER_SECOND $OLD_SLOW_IO_EVENTS
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log_must zinject -c all
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}
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function multiple_slow_vdevs_test
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{
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log_must truncate -s 1G $VDEVS
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default_raidz_setup_noexit $VDEVS
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log_must zpool events -c
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log_must zfs set compression=off $TESTPOOL
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log_must zfs set primarycache=none $TESTPOOL
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log_must zfs set recordsize=4K $TESTPOOL
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log_must dd if=/dev/urandom of=$FILEPATH bs=1M count=20
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zpool sync
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#
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# Read the file with slow io injected on the disks
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# This will cause multiple errors on each disk to trip ZED SERD
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#
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# pool: slow_io_pool
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# state: ONLINE
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# config:
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#
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# NAME STATE READ WRITE CKSUM SLOW
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# slow_io_pool ONLINE 0 0 0 -
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# raidz1-0 ONLINE 0 0 0 -
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# /var/tmp/vdevfile1.499278 ONLINE 0 0 0 113
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# /var/tmp/vdevfile2.499278 ONLINE 0 0 0 109
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# /var/tmp/vdevfile3.499278 ONLINE 0 0 0 96
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# /var/tmp/vdevfile4.499278 ONLINE 0 0 0 109
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#
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start_slow_io
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dd if=$FILEPATH of=/dev/null bs=1M count=20 2>/dev/null
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stop_slow_io
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# count events available for processing
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typeset -i i=0
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typeset -i events=0
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while [[ $i -lt 60 ]]; do
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events=$(zpool events | grep "ereport\.fs\.zfs.delay" | wc -l)
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[[ $events -ge "50" ]] && break
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i=$((i+1))
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sleep 1
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done
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log_note "$events delay events found"
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if [[ $events -lt "50" ]]; then
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log_note "bailing: not enough events to complete the test"
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destroy_pool $TESTPOOL
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return
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fi
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#
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# give slow ZED a chance to process the delay events
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#
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typeset -i i=0
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typeset -i skips=0
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while [[ $i -lt 75 ]]; do
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skips=$(grep "retiring case" \
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$ZEDLET_DIR/zed.log | wc -l)
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[[ $skips -gt "0" ]] && break
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i=$((i+1))
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sleep 1
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done
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log_note $skips degrade skips in ZED log after $i seconds
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[ $skips -gt "0" ] || log_fail "expecting to see skips"
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degrades=$(grep "zpool_vdev_degrade" $ZEDLET_DIR/zed.log | wc -l)
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log_note $degrades vdev degrades in ZED log
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[ $degrades -eq "0" ] || \
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log_fail "expecting no degrade events, found $degrades"
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destroy_pool $TESTPOOL
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}
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log_assert "Test ZED slow io across multiple vdevs"
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log_onexit cleanup
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log_must zed_events_drain
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log_must zed_start
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multiple_slow_vdevs_test
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log_pass "Test ZED slow io across multiple vdevs"
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@@ -32,5 +32,6 @@ cleanup_devices $DISKS
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zed_stop
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zed_cleanup resilver_finish-start-scrub.sh
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zed_events_drain
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log_pass
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@@ -28,6 +28,7 @@
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verify_runnable "global"
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zed_events_drain
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zed_setup resilver_finish-start-scrub.sh
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zed_start
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Reference in New Issue
Block a user