Commits on Jul 23, 2024

1. ddt: dedup table quota enforcement …

   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.
   Co-authored-by: Rob Wing <[email protected]>
   Co-authored-by: Sean Eric Fagan <[email protected]>
   Co-authored-by: Allan Jude <[email protected]>
   Signed-off-by: Rob Norris <[email protected]>
   Signed-off-by: Don Brady <[email protected]>

   

   4 people committed Jul 23, 2024
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