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72f0521aba
Many things has changed since previous default was set many years ago. Nowadays 8KB does not allow adequate compression or even decent space efficiency on many of pools due to 4KB disk physical block rounding, especially on RAIDZ and DRAID. It effectively limits write throughput to only 2-3GB/s (250-350K blocks/s) due to sync thread, allocation, vdev queue and other block rate bottlenecks. It keeps L2ARC expensive despite many optimizations and dedup just unrealistic. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Closes #12406
60 lines
1.7 KiB
Bash
Executable File
60 lines
1.7 KiB
Bash
Executable File
#!/bin/ksh
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#
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# This file and its contents are supplied under the terms of the
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# Common Development and Distribution License ("CDDL"), version 1.0.
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# You may only use this file in accordance with the terms of version
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# 1.0 of the CDDL.
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#
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# A full copy of the text of the CDDL should have accompanied this
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# source. A copy of the CDDL is also available via the Internet at
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# http://www.illumos.org/license/CDDL.
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#
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#
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# Copyright (c) 2012, 2016 by Delphix. All rights reserved.
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#
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. $STF_SUITE/include/libtest.shlib
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. $STF_SUITE/tests/functional/nopwrite/nopwrite.shlib
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#
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# Description:
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# Verify that nopwrite cannot be enabled on volumes
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#
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# Strategy:
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# 1. Create a clone of a volume that fits the criteria for nopwrite.
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# 2. Overwrite the same blocks from the origin vol and verify that
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# new space is consumed.
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#
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verify_runnable "global"
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origin="$TESTPOOL/$TESTVOL"
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clone="$TESTPOOL/clone"
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vol="${ZVOL_RDEVDIR}/$origin"
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volclone="${ZVOL_RDEVDIR}/$clone"
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log_onexit cleanup
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function cleanup
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{
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datasetexists $origin && log_must zfs destroy -R $origin
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# No need to recreate the volume as no other tests expect it.
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}
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log_assert "nopwrite works on volumes"
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log_must zfs set compress=on $origin
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log_must zfs set checksum=sha256 $origin
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dd if=/dev/urandom of=$vol bs=16384 count=2048 conv=notrunc >/dev/null \
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2>&1 || log_fail "dd into $origin failed."
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zfs snapshot $origin@a || log_fail "zfs snap failed"
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log_must zfs clone $origin@a $clone
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log_must zfs set compress=on $clone
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log_must zfs set checksum=sha256 $clone
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block_device_wait
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dd if=$vol of=$volclone bs=16384 count=2048 conv=notrunc >/dev/null 2>&1 || \
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log_fail "dd into $clone failed."
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log_must verify_nopwrite $origin $origin@a $clone
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log_pass "nopwrite works on volumes"
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