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