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#	Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present.
27#
28# STRATEGY:
29#	1. Create pool with a cache device.
30#	2. Create a random file in that pool and random read for 10 sec.
31#	3. Offline the L2ARC device.
32#	4. Read the amount of log blocks written from the header of the
33#		L2ARC device.
34#	5. Online the L2ARC device.
35#	6. Read the amount of log blocks rebuilt in arcstats and compare to
36#		(4).
37#	7. Check if the labels of the L2ARC device are intact.
38#
39
40verify_runnable "global"
41
42command -v fio > /dev/null || log_unsupported "fio missing"
43
44log_assert "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."
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	log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
54		$rebuild_blocks_min_l2size
55}
56log_onexit cleanup
57
58# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
59typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
60typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
61log_must set_tunable32 L2ARC_NOPREFETCH 0
62log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0
63
64typeset fill_mb=800
65typeset cache_sz=$(( floor($fill_mb / 2) ))
66export FILE_SIZE=$(( 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
75arcstat_quiescence_noecho l2_size
76log_must zpool offline $TESTPOOL $VDEV_CACHE
77arcstat_quiescence_noecho l2_size
78
79typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
80typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE | awk '/log_blk_count/ {print $2}')
81
82log_must zpool online $TESTPOOL $VDEV_CACHE
83arcstat_quiescence_noecho l2_size
84
85typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
86
87# Upon onlining the cache device we might write additional blocks to it
88# before it is marked for rebuild as the l2ad_* parameters are not cleared
89# when offlining the device. See comment in l2arc_rebuild_vdev().
90# So we cannot compare the amount of rebuilt log blocks to the amount of log
91# blocks read from the header of the device.
92log_must test $(( $l2_rebuild_log_blk_end - \
93	$l2_rebuild_log_blk_start )) -gt 0
94log_must test $l2_dh_log_blk -gt 0
95
96log_must zpool offline $TESTPOOL $VDEV_CACHE
97arcstat_quiescence_noecho l2_size
98
99log_must zdb -lq $VDEV_CACHE
100
101log_must zpool destroy -f $TESTPOOL
102
103log_pass "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."
104