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ddt: dedup table quota enforcement

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This adds two new pool properties:
- dedup_table_size, the total size of all DDTs on the pool; and
- dedup_table_quota, the maximum possible size of all DDTs in the pool

When set, quota will be enforced by checking when a new entry is about
to be created. If the pool is over its dedup quota, the entry won't be
created, and the corresponding write will be converted to a regular
non-dedup write. Note that existing entries can be updated (ie their
refcounts changed), as that reuses the space rather than requiring more.

dedup_table_quota can be set to 'auto', which will set it based on the
size of the devices backing the "dedup" allocation device. This makes it
possible to limit the DDTs to the size of a dedup vdev only, such that
when the device fills, no new blocks are deduplicated.

Sponsored-by: iXsystems, Inc.
Sponsored-By: Klara Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Signed-off-by: Don Brady <don.brady@klarasystems.com>
Co-authored-by: Don Brady <don.brady@klarasystems.com>
Co-authored-by: Rob Wing <rob.wing@klarasystems.com>
Co-authored-by: Sean Eric Fagan <sean.fagan@klarasystems.com>
Closes #15889
This commit is contained in:
Allan Jude
2024-07-25 12:47:36 -04:00
committed by GitHub
parent 82f281ad99
commit c7ada64bb6
22 changed files with 599 additions and 22 deletions
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tests/zfs-tests/include/tunables.cfg
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@@ -28,6 +28,7 @@ CONDENSE_INDIRECT_COMMIT_ENTRY_DELAY_MS condense.indirect_commit_entry_delay_ms
CONDENSE_INDIRECT_OBSOLETE_PCT condense.indirect_obsolete_pct zfs_condense_indirect_obsolete_pct
CONDENSE_MIN_MAPPING_BYTES condense.min_mapping_bytes zfs_condense_min_mapping_bytes
DBUF_CACHE_SHIFT dbuf.cache_shift dbuf_cache_shift
DDT_ZAP_DEFAULT_BS ddt_zap_default_bs ddt_zap_default_bs
DEADMAN_CHECKTIME_MS deadman.checktime_ms zfs_deadman_checktime_ms
DEADMAN_EVENTS_PER_SECOND deadman_events_per_second zfs_deadman_events_per_second
DEADMAN_FAILMODE deadman.failmode zfs_deadman_failmode