git: ecdf406d4b - main - Status/2024Q2/openzfs.adoc: Add report

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/doc/commit/?id=ecdf406d4be4eec2f0297d04db61e9a1fc140fae

commit ecdf406d4be4eec2f0297d04db61e9a1fc140fae
Author:     Paweł Jakub Dawidek <[email protected]>
AuthorDate: 2024-07-23 10:16:29 +0000
Commit:     Lorenzo Salvadore <[email protected]>
CommitDate: 2024-08-01 11:04:22 +0000

    Status/2024Q2/openzfs.adoc: Add report
    
    Reviewed by:    status (Pau Amma <[email protected]>)
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 .../en/status/report-2024-04-2024-06/openzfs.adoc  | 26 ++++++++++++++++++++++
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+=== Hierarchical rate limits for OpenZFS
+
+Links: +
+link:https://github.com/openzfs/zfs/pull/16205[Pull request] URL: link:https://github.com/openzfs/zfs/pull/16205[]
+
+Contact: Pawel Dawidek <[email protected]>
+
+Rate limits allow to limit bandwidth and number of metadata operations per dataset.
+
+Hierarchical rate limits allow for granular resource control especially in shared environments, eg. when a single ZFS pool serves data to multiple, independent virtual machines or jails.
+
+Because the limits are hierarchical, they are enforced like the quota property: the children datasets must obey the limits of the parent dataset.
+
+The limits can be configured using six new properties:
+limit_bw_read, limit_bw_write, limit_bw_total, limit_op_read, limit_op_write, limit_op_total
+The limit_bw_* properties limit the read, write, or combined bandwidth, respectively, that a dataset and its descendants can consume.
+Those limits are in bytes per second.
+The limit_op_* properties limit the read, write, or both metadata operations, respectively, that a dataset and its descendants can generate.
+Those limits are in number of operations per second.
+
+Limits are applied to file systems and ZFS volumes (and their snapshots).
+
+The initial work is done and the pull request is up for review.
+
+Sponsor: Klara Systems
+Sponsor: FreeBSD Foundation