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 fails as expected when L2ARC_REBUILD_ENABLED = 0
27#
28# STRATEGY:
29#	1. Set L2ARC_REBUILD_ENABLED = 0
30#	2. Create pool with a cache device.
31#	3. Create a random file in that pool and random read for 10 sec.
32#	4. Export pool.
33#	5. Import pool.
34#	6. Check in zpool iostat if the cache device has space allocated.
35#	7. Read the file written in (3) and check if l2_hits in
36#		/proc/spl/kstat/zfs/arcstats increased.
37#
38
39verify_runnable "global"
40
41command -v fio > /dev/null || log_unsupported "fio missing"
42
43log_assert "Persistent L2ARC fails as expected when L2ARC_REBUILD_ENABLED = 0."
44
45function cleanup
46{
47	if poolexists $TESTPOOL ; then
48		destroy_pool $TESTPOOL
49	fi
50
51	log_must set_tunable32 L2ARC_REBUILD_ENABLED $rebuild_enabled
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
60# disable L2ARC rebuild
61typeset rebuild_enabled=$(get_tunable L2ARC_REBUILD_ENABLED)
62log_must set_tunable32 L2ARC_REBUILD_ENABLED 0
63
64typeset fill_mb=800
65typeset cache_sz=$(( 2 * $fill_mb ))
66export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
67
68log_must truncate -s ${cache_sz}M $VDEV_CACHE
69
70log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
71
72log_must fio $FIO_SCRIPTS/mkfiles.fio
73log_must fio $FIO_SCRIPTS/random_reads.fio
74
75log_must zpool export $TESTPOOL
76
77typeset l2_success_start=$(get_arcstat l2_rebuild_success)
78
79log_must zpool import -d $VDIR $TESTPOOL
80log_mustnot test "$(zpool iostat -Hpv $TESTPOOL $VDEV_CACHE | awk '{print $2}')" -gt 80000000
81
82typeset l2_success_end=$(get_arcstat l2_rebuild_success)
83
84log_mustnot test $l2_success_end -gt $l2_success_start
85
86log_must zpool destroy -f $TESTPOOL
87log_must set_tunable32 L2ARC_REBUILD_ENABLED $rebuild_enabled
88
89log_pass "Persistent L2ARC fails as expected when L2ARC_REBUILD_ENABLED = 0."
90