zfs: add a note about dRaid performance

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

diff --git a/local-zfs.adoc b/local-zfs.adoc
index a1a14e45e05ba6e618e4e9f0b5114e230bf87cf5..718b737b75a5d59b9f919a4cfca8b604f5e7cea7 100644 (file)
--- a/local-zfs.adoc
+++ b/local-zfs.adoc
@@ -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
 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.