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 with an unencrypted ZFS file system succeeds 27# 28# STRATEGY: 29# 1. Create pool with a cache device. 30# 2. Export and re-import pool without writing any data. 31# 3. Create a random file in that pool and random read for 10 sec. 32# 4. Export pool. 33# 5. Read the amount of log blocks written from the header of the 34# L2ARC device. 35# 6. Import pool. 36# 7. Read the amount of log blocks rebuilt in arcstats and compare to 37# (5). 38# 8. Check if the labels of the L2ARC device are intact. 39# 40# * We can predict the minimum bytes of L2ARC restored if we subtract 41# from the effective size of the cache device the bytes l2arc_evict() 42# evicts: 43# l2: L2ARC device size - VDEV_LABEL_START_SIZE - l2ad_dev_hdr_asize 44# wr_sz: l2arc_write_max + l2arc_write_boost (worst case) 45# blk_overhead: wr_sz / SPA_MINBLOCKSIZE / (l2 / SPA_MAXBLOCKSIZE) * 46# sizeof (l2arc_log_blk_phys_t) 47# min restored size: l2 - (wr_sz + blk_overhead) 48# 49 50verify_runnable "global" 51 52log_assert "Persistent L2ARC with an unencrypted ZFS file system succeeds." 53 54function cleanup 55{ 56 if poolexists $TESTPOOL ; then 57 destroy_pool $TESTPOOL 58 fi 59 60 log_must set_tunable32 l2arc_noprefetch $noprefetch 61 log_must set_tunable32 l2arc_rebuild_blocks_min_l2size \ 62 $rebuild_blocks_min_l2size 63} 64log_onexit cleanup 65 66# l2arc_noprefetch is set to 0 to let L2ARC handle prefetches 67typeset noprefetch=$(get_tunable l2arc_noprefetch) 68typeset rebuild_blocks_min_l2size=$(get_tunable l2arc_rebuild_blocks_min_l2size) 69log_must set_tunable32 l2arc_noprefetch 0 70log_must set_tunable32 l2arc_rebuild_blocks_min_l2size 0 71 72typeset fill_mb=800 73typeset cache_sz=$(( floor($fill_mb / 2) )) 74export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M 75 76log_must truncate -s ${cache_sz}M $VDEV_CACHE 77 78log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE 79 80log_must zpool export $TESTPOOL 81log_must zpool import -d $VDIR $TESTPOOL 82 83log_must fio $FIO_SCRIPTS/mkfiles.fio 84log_must fio $FIO_SCRIPTS/random_reads.fio 85 86arcstat_quiescence_noecho l2_size 87log_must zpool export $TESTPOOL 88arcstat_quiescence_noecho l2_feeds 89 90typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE | grep log_blk_count | \ 91 awk '{print $2}') 92 93typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks) 94 95log_must zpool import -d $VDIR $TESTPOOL 96arcstat_quiescence_noecho l2_size 97 98typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks) 99 100log_must test $l2_dh_log_blk -eq $(( $l2_rebuild_log_blk_end - 101 $l2_rebuild_log_blk_start )) 102log_must test $l2_dh_log_blk -gt 0 103 104log_must zpool offline $TESTPOOL $VDEV_CACHE 105arcstat_quiescence_noecho l2_size 106 107log_must zdb -lllq $VDEV_CACHE 108 109log_must zpool destroy -f $TESTPOOL 110 111log_pass "Persistent L2ARC with an unencrypted ZFS file system succeeds." 112