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Make ganging redundancy respect redundant_metadata property (#17073)

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The redundant_metadata setting in ZFS allows users to trade resilience
for performance and space savings. This applies to all data and metadata
blocks in zfs, with one exception: gang blocks. Gang blocks currently
just take the copies property of the IO being ganged and, if it's 1,
sets it to 2. This means that we always make at least two copies of a
gang header, which is good for resilience. However, if the users care
more about performance than resilience, their gang blocks will be even
more of a penalty than usual.

We add logic to calculate the number of gang headers copies directly,
and store it as a separate IO property. This is stored in the IO
properties and not calculated when we decide to gang because by that
point we may not have easy access to the relevant information about what
kind of block is being stored. We also check the redundant_metadata
property when doing so, and use that to decide whether to store an extra
copy of the gang headers, compared to the underlying blocks.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.

Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Co-authored-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
This commit is contained in:
Paul Dagnelie
2025-03-19 15:58:29 -07:00
committed by GitHub
parent 94b9cbbe1e
commit 9250403ba6
15 changed files with 327 additions and 20 deletions
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tests/zfs-tests/include/tunables.cfg
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@@ -64,6 +64,7 @@ MAX_DATASET_NESTING max_dataset_nesting zfs_max_dataset_nesting
MAX_MISSING_TVDS max_missing_tvds zfs_max_missing_tvds
METASLAB_DEBUG_LOAD metaslab.debug_load metaslab_debug_load
METASLAB_FORCE_GANGING metaslab.force_ganging metaslab_force_ganging
METASLAB_FORCE_GANGING_PCT metaslab.force_ganging_pct metaslab_force_ganging_pct
MULTIHOST_FAIL_INTERVALS multihost.fail_intervals zfs_multihost_fail_intervals
MULTIHOST_HISTORY multihost.history zfs_multihost_history
MULTIHOST_IMPORT_INTERVALS multihost.import_intervals zfs_multihost_import_intervals