1#!/bin/ksh -p
2#
3# CDDL HEADER START
4#
5# This file and its contents are supplied under the terms of the
6# Common Development and Distribution License ("CDDL"), version 1.0.
7# You may only use this file in accordance with the terms of version
8# 1.0 of the CDDL.
9#
10# A full copy of the text of the CDDL should have accompanied this
11# source.  A copy of the CDDL is also available via the Internet at
12# http://www.illumos.org/license/CDDL.
13#
14# CDDL HEADER END
15#
16
17#
18# Copyright (c) 2020, George Amanakis. All rights reserved.
19#
20
21. $STF_SUITE/include/libtest.shlib
22. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
23
24#
25# DESCRIPTION:
26#	Persistent L2ARC restores all written log blocks
27#
28# STRATEGY:
29#	1. Create pool with a cache device.
30#	2. Create a random file in that pool, smaller than the cache device
31#		and random read for 10 sec.
32#	3. Export pool.
33#	4. Read amount of log blocks written.
34#	5. Import pool.
35#	6. Read amount of log blocks built.
36#	7. Compare the two amounts.
37#	8. Read the file written in (2) and check if l2_hits in
38#		/proc/spl/kstat/zfs/arcstats increased.
39#	9. Check if the labels of the L2ARC device are intact.
40#
41
42verify_runnable "global"
43
44log_assert "Persistent L2ARC restores all written log blocks."
45
46function cleanup
47{
48	if poolexists $TESTPOOL ; then
49		destroy_pool $TESTPOOL
50	fi
51
52	log_must set_tunable32 l2arc_noprefetch $noprefetch
53}
54log_onexit cleanup
55
56# l2arc_noprefetch is set to 0 to let L2ARC handle prefetches
57typeset noprefetch=$(get_tunable l2arc_noprefetch)
58log_must set_tunable32 l2arc_noprefetch 0
59
60typeset fill_mb=800
61typeset cache_sz=$(( 2 * $fill_mb ))
62export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
63
64log_must truncate -s ${cache_sz}M $VDEV_CACHE
65
66typeset log_blk_start=$(get_arcstat l2_log_blk_writes)
67
68log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
69
70log_must fio $FIO_SCRIPTS/mkfiles.fio
71log_must fio $FIO_SCRIPTS/random_reads.fio
72
73arcstat_quiescence_noecho l2_size
74log_must zpool export $TESTPOOL
75arcstat_quiescence_noecho l2_feeds
76
77typeset log_blk_end=$(get_arcstat l2_log_blk_writes)
78typeset log_blk_rebuild_start=$(get_arcstat l2_rebuild_log_blks)
79
80log_must zpool import -d $VDIR $TESTPOOL
81
82typeset l2_hits_start=$(get_arcstat l2_hits)
83
84log_must fio $FIO_SCRIPTS/random_reads.fio
85arcstat_quiescence_noecho l2_size
86
87typeset log_blk_rebuild_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
88typeset l2_hits_end=$(get_arcstat l2_hits)
89
90log_must test $(( $log_blk_rebuild_end - $log_blk_rebuild_start )) -eq \
91	$(( $log_blk_end - $log_blk_start ))
92
93log_must test $l2_hits_end -gt $l2_hits_start
94
95log_must zpool offline $TESTPOOL $VDEV_CACHE
96arcstat_quiescence_noecho l2_size
97
98log_must zdb -lq $VDEV_CACHE
99
100log_must zpool destroy -f $TESTPOOL
101
102log_pass "Persistent L2ARC restores all written log blocks."
103