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c197a77c3c
Relax allocation throttling for ditto blocks. Due to random imbalances in allocation it tends to push block copies to one vdev, that looks slightly better at the moment. Slightly less strict policy allows both improve data security and surprisingly write performance, since we don't need to touch extra metaslabs on each vdev to respect the min distance. Sponsored by: iXsystems, Inc. Authored by: mav <mav@FreeBSD.org> Reviewed by: Matt Ahrens <mahrens@delphix.com> Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com> Ported-by: Brian Behlendorf <behlendorf1@llnl.gov> OpenZFS-issue: https://illumos.org/issues/9751 FreeBSD-commit: https://github.com/freebsd/freebsd/commit/8253837ac3 Closes #7857 |
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