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ZTS: Add L2ARC DWPD and parallel writes tests

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Add four new functional tests to validate L2ARC DWPD rate limiting and
parallel write features:

- l2arc_dwpd_ratelimit_pos: Verifies DWPD rate limiting with different
  values (0, 100, 1000, 10000) and ordering
- l2arc_dwpd_reimport_pos: Verifies DWPD rate limiting persists after
  pool export/import
- l2arc_multidev_scaling_pos: Verifies parallel write scaling ratio
  (dual devices achieve ~2× single device throughput)
- l2arc_multidev_throughput_pos: Verifies absolute parallel write
  throughput scales with device count (~32MB/s per device)

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18093
This commit is contained in:
Ameer Hamza
2025-12-29 23:44:28 +05:00
committed by Brian Behlendorf
parent 48d3f7fac9
commit 13552d754f
10 changed files with 618 additions and 4 deletions
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tests/runfiles/common.run
+2 -1
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@@ -1130,7 +1130,8 @@ tags = ['functional', 'log_spacemap']
[tests/functional/l2arc]
tests = ['l2arc_arcstats_pos', 'l2arc_mfuonly_pos', 'l2arc_l2miss_pos',
'persist_l2arc_001_pos', 'persist_l2arc_002_pos',
'l2arc_dwpd_ratelimit_pos', 'l2arc_dwpd_reimport_pos', 'l2arc_multidev_scaling_pos',
'l2arc_multidev_throughput_pos', 'persist_l2arc_001_pos', 'persist_l2arc_002_pos',
'persist_l2arc_003_neg', 'persist_l2arc_004_pos', 'persist_l2arc_005_pos']
tags = ['functional', 'l2arc']