man: replace inaccurate dedup memory rule of thumb#18185
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chrislongros wants to merge 1 commit intoopenzfs:masterfrom
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man: replace inaccurate dedup memory rule of thumb#18185chrislongros wants to merge 1 commit intoopenzfs:masterfrom
chrislongros wants to merge 1 commit intoopenzfs:masterfrom
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The man page stated '1.25 GiB of RAM per 1 TiB of storage' as a recommendation for deduplication. This rule of thumb is misleading because actual memory requirements depend on the dedup table (DDT) size, which varies with the number of unique blocks, block size, and dedup algorithm, not simply total storage capacity. Replace the fixed ratio with a description of the actual factors that determine dedup memory requirements. Closes openzfs#2829 Signed-off-by: Christos Longros <[email protected]>
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The man page states '1.25 GiB of RAM per 1 TiB of storage' as a recommendation for deduplication. This rule of thumb is misleading because actual memory requirements depend on the dedup table (DDT) size, which varies with the number of unique blocks, block size, and dedup algorithm—not simply total storage capacity.
Replace the fixed ratio with a description of the actual factors that determine dedup memory requirements.
Closes #2829