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#!/bin/ksh -p
#
# CDDL HEADER START
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source. A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#
# CDDL HEADER END
#
#
# Copyright (c) 2020, George Amanakis. All rights reserved.
#
. $STF_SUITE/tests/functional/cache/cache.cfg
. $STF_SUITE/tests/functional/cache/cache.kshlib
#
# DESCRIPTION:
# Looping around a cache device with l2arc_write_size exceeding
# the device size succeeds.
#
# STRATEGY:
# 1. Create pool with a cache device.
# 2. Set l2arc_write_max to a value larger than the cache device.
# 3. Create a file larger than the cache device and random read
# for 10 sec.
# 4. Verify that l2arc_write_max is set back to the default.
# 5. Set l2arc_write_max to a value less than the cache device size but
# larger than the default (64MB).
# 6. Record the l2_size.
# 7. Random read for 1 sec.
# 8. Record the l2_size again.
# 9. If (6) <= (8) then we have not looped around yet.
# 10. If (6) > (8) then we looped around. Break out of the loop and test.
# 11. Destroy pool.
#
verify_runnable "global"
command -v fio > /dev/null || log_unsupported "fio missing"
log_assert "Looping around a cache device succeeds."
function cleanup
{
if poolexists $TESTPOOL ; then
destroy_pool $TESTPOOL
fi
log_must set_tunable32 L2ARC_WRITE_MAX $write_max
log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
}
log_onexit cleanup
typeset write_max=$(get_tunable L2ARC_WRITE_MAX)
typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
log_must set_tunable32 L2ARC_NOPREFETCH 0
typeset VDEV="$VDIR/vdev.disk"
typeset VDEV_SZ=$(( 4 * 1024 * 1024 * 1024 ))
typeset VCACHE="$VDIR/vdev.cache"
typeset VCACHE_SZ=$(( $VDEV_SZ / 2 ))
typeset fill_mb=$(( floor($VDEV_SZ * 3 / 4 ) ))
export DIRECTORY=/$TESTPOOL
export NUMJOBS=4
export RUNTIME=10
export PERF_RANDSEED=1234
export PERF_COMPPERCENT=66
export PERF_COMPCHUNK=0
export BLOCKSIZE=128K
export SYNC_TYPE=0
export DIRECT=1
export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))
log_must set_tunable32 L2ARC_WRITE_MAX $(( $VCACHE_SZ * 2 ))
log_must truncate -s $VCACHE_SZ $VCACHE
log_must truncate -s $VDEV_SZ $VDEV
log_must zpool create -f $TESTPOOL $VDEV cache $VCACHE
log_must fio $FIO_SCRIPTS/mkfiles.fio
log_must fio $FIO_SCRIPTS/random_reads.fio
typeset write_max2=$(get_tunable L2ARC_WRITE_MAX)
log_must test $write_max2 -eq $write_max
log_must set_tunable32 L2ARC_WRITE_MAX $(( 64 * 1024 * 1024 ))
export RUNTIME=1
typeset do_once=true
while $do_once || [[ $l2_size1 -le $l2_size2 ]]; do
typeset l2_size1=$(get_arcstat l2_size)
log_must fio $FIO_SCRIPTS/random_reads.fio
typeset l2_size2=$(get_arcstat l2_size)
do_once=false
done
log_must test $l2_size1 -gt $l2_size2
log_must zpool destroy $TESTPOOL
log_pass "Looping around a cache device succeeds."
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