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zfs: add a note about dRaid performance

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Based on statements from the openZFS documentation where it is described
as providing "the same level of redundancy and performance as raidz" [0].

[0] https://openzfs.github.io/openzfs-docs/Basic%20Concepts/dRAID%20Howto.html
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Folke Gleumes 2024-03-20 16:52:19 +01:00 committed by Aaron Lauterer
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local-zfs.adoc
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@ -180,6 +180,8 @@ A 'RAIDZ' of any redundancy level will approximately behave like a single disk
in regard to IOPS with a lot of bandwidth. How much bandwidth depends on the in regard to IOPS with a lot of bandwidth. How much bandwidth depends on the
size of the RAIDZ vdev and the redundancy level. size of the RAIDZ vdev and the redundancy level.
A 'dRAID' pool should match the performance of an equivalent 'RAIDZ' pool.
For running VMs, IOPS is the more important metric in most situations. For running VMs, IOPS is the more important metric in most situations.