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ZTS: Fix fault_limits timeouts

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fault_limits would often hit the 10min timeout and be killed on Fedora
41-42.  Investigation showed that the 'fill_fs' portion of the test,
which would fill the pool with junk data before vdev replacement, was
writing highly compressible data (~126x), which would have taxed the
CPUs, potentially causing the timeout.

The fix is to write random data and reduce the number of writes.
This has an added benefit that more real data being is written to the
pool (~1GB) vs the old way (~300-400MB).  It also speeds up the test.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #17709
This commit is contained in:
Tony Hutter 2025-09-09 13:42:01 -07:00 committed by Brian Behlendorf
parent cfd640c3e8
commit 87e35bd3ab
1 changed files with 1 additions and 1 deletions
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2
tests/zfs-tests/tests/functional/fault/fault_limits.ksh
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@ -67,7 +67,7 @@ log_must zpool create -f ${TESTPOOL} raidz${PARITY} ${disks[1..$((VDEV_CNT - 1))
# Add some data to the pool
log_must zfs create $TESTPOOL/fs
MNTPOINT="$(get_prop mountpoint $TESTPOOL/fs)"
log_must fill_fs $MNTPOINT $PARITY 200 32768 1000 Z
log_must fill_fs $MNTPOINT $PARITY 200 32768 100 R
sync_pool $TESTPOOL
# Replace the last child vdev to form a replacing vdev