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/tests/functional/cache/cache.cfg 22. $STF_SUITE/tests/functional/cache/cache.kshlib 23 24# 25# DESCRIPTION: 26# Looping around a cache device with l2arc_write_size exceeding 27# the device size succeeds. 28# 29# STRATEGY: 30# 1. Create pool with a cache device. 31# 2. Set l2arc_write_max to a value larger than the cache device. 32# 3. Create a file larger than the cache device and random read 33# for 10 sec. 34# 4. Verify that l2arc_write_max is set back to the default. 35# 5. Set l2arc_write_max to a value less than the cache device size but 36# larger than the default (256MB). 37# 6. Record the l2_size. 38# 7. Random read for 1 sec. 39# 8. Record the l2_size again. 40# 9. If (6) <= (8) then we have not looped around yet. 41# 10. If (6) > (8) then we looped around. Break out of the loop and test. 42# 11. Destroy pool. 43# 44 45verify_runnable "global" 46 47command -v fio > /dev/null || log_unsupported "fio missing" 48 49log_assert "Looping around a cache device succeeds." 50 51function cleanup 52{ 53 if poolexists $TESTPOOL ; then 54 destroy_pool $TESTPOOL 55 fi 56 57 log_must set_tunable32 L2ARC_WRITE_MAX $write_max 58 log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch 59} 60log_onexit cleanup 61 62typeset write_max=$(get_tunable L2ARC_WRITE_MAX) 63typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH) 64log_must set_tunable32 L2ARC_NOPREFETCH 0 65 66typeset VDEV="$VDIR/vdev.disk" 67typeset VDEV_SZ=$(( 4 * 1024 * 1024 * 1024 )) 68typeset VCACHE="$VDIR/vdev.cache" 69typeset VCACHE_SZ=$(( $VDEV_SZ / 2 )) 70 71typeset fill_mb=$(( floor($VDEV_SZ * 3 / 4 ) )) 72export DIRECTORY=/$TESTPOOL 73export NUMJOBS=4 74export RUNTIME=10 75export PERF_RANDSEED=1234 76export PERF_COMPPERCENT=66 77export PERF_COMPCHUNK=0 78export BLOCKSIZE=128K 79export SYNC_TYPE=0 80export DIRECT=1 81export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) )) 82 83log_must set_tunable32 L2ARC_WRITE_MAX $(( $VCACHE_SZ * 2 )) 84 85log_must truncate -s $VCACHE_SZ $VCACHE 86log_must truncate -s $VDEV_SZ $VDEV 87 88log_must zpool create -f $TESTPOOL $VDEV cache $VCACHE 89 90# Actually, this test relies on atime writes to force the L2 ARC discards 91log_must zfs set relatime=off $TESTPOOL 92 93log_must fio $FIO_SCRIPTS/mkfiles.fio 94log_must fio $FIO_SCRIPTS/random_reads.fio 95 96typeset write_max2=$(get_tunable L2ARC_WRITE_MAX) 97 98log_must test $write_max2 -eq $write_max 99 100log_must set_tunable32 L2ARC_WRITE_MAX $(( 256 * 1024 * 1024 )) 101export RUNTIME=1 102 103typeset do_once=true 104while $do_once || [[ $l2_size1 -le $l2_size2 ]]; do 105 typeset l2_size1=$(get_arcstat l2_size) 106 log_must fio $FIO_SCRIPTS/random_reads.fio 107 typeset l2_size2=$(get_arcstat l2_size) 108 do_once=false 109done 110 111log_must test $l2_size1 -gt $l2_size2 112 113log_must zpool destroy $TESTPOOL 114 115log_pass "Looping around a cache device succeeds." 116