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l2arc_arcstats_pos.ksh
(3.02 KB)
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l2arc_l2miss_pos.ksh
(2.76 KB)
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l2arc_mfuonly_pos.ksh
(2.74 KB)
Editing: l2arc_mfuonly_pos.ksh
#!/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/include/libtest.shlib . $STF_SUITE/tests/functional/l2arc/l2arc.cfg # # DESCRIPTION: # l2arc_mfuonly does not cache MRU buffers # # STRATEGY: # 1. Set l2arc_mfuonly=yes # 2. Create pool with a cache device. # 3. Create a random file in that pool, smaller than the cache device # and random read for 10 sec. # 4. Export and re-import the pool. This is necessary as some MFU ghost # buffers with prefetch status may transition to MRU eventually. # By re-importing the pool the l2 arcstats reflect the ARC state # of L2ARC buffers upon their caching in L2ARC. # 5. Verify l2arc_mru_asize is 0. # verify_runnable "global" log_assert "l2arc_mfuonly does not cache MRU buffers." function cleanup { if poolexists $TESTPOOL ; then destroy_pool $TESTPOOL fi log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch log_must set_tunable32 L2ARC_MFUONLY $mfuonly log_must set_tunable32 PREFETCH_DISABLE $zfsprefetch } log_onexit cleanup # L2ARC_NOPREFETCH is set to 1 as some prefetched buffers may # transition to MRU. typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH) log_must set_tunable32 L2ARC_NOPREFETCH 1 typeset mfuonly=$(get_tunable L2ARC_MFUONLY) log_must set_tunable32 L2ARC_MFUONLY 1 typeset zfsprefetch=$(get_tunable PREFETCH_DISABLE) log_must set_tunable32 PREFETCH_DISABLE 1 typeset fill_mb=800 typeset cache_sz=$(( 1.4 * $fill_mb )) export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M log_must truncate -s ${cache_sz}M $VDEV_CACHE typeset log_blk_start=$(get_arcstat l2_log_blk_writes) log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE log_must fio $FIO_SCRIPTS/mkfiles.fio log_must fio $FIO_SCRIPTS/random_reads.fio log_must zpool export $TESTPOOL log_must zpool import -d $VDIR $TESTPOOL # Regardless of l2arc_noprefetch, some MFU buffers might be evicted # from ARC, accessed later on as prefetches and transition to MRU as # prefetches. # If accessed again they are counted as MRU and the l2arc_mru_asize arcstat # will not be 0 (mentioned also in zfs-module-parameters.5) # For the purposes of this test we mitigate this by disabling (predictive) # ZFS prefetches with zfs_prefetch_disable=1. log_must test $(get_arcstat l2_mru_asize) -eq 0 log_must zpool destroy -f $TESTPOOL log_pass "l2arc_mfuonly does not cache MRU buffers."
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