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local-zfs: rephrase ZFS RAID description

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I tried to make the performance impact clearer, as what "behave like a number of disks"
actually means wasn't quite clear to me.

Use "in regard to" rather than "in regard of", as I couldn't find
any source that this phrase is (commonly) used in modern english.

Signed-off-by: Matthias Heiserer <m.heiserer@proxmox.com>
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Matthias Heiserer 2022-11-18 12:09:47 +01:00 committed by Thomas Lamprecht
parent 0d4a93dc78
commit f1b7d1a307
1 changed files with 5 additions and 5 deletions
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@ -167,17 +167,17 @@ Each `vdev` type has different performance behaviors. The two
parameters of interest are the IOPS (Input/Output Operations per Second) and parameters of interest are the IOPS (Input/Output Operations per Second) and
the bandwidth with which data can be written or read. the bandwidth with which data can be written or read.
A 'mirror' vdev (RAID1) will approximately behave like a single disk in regards A 'mirror' vdev (RAID1) will approximately behave like a single disk in regard
to both parameters when writing data. When reading data if will behave like the to both parameters when writing data. When reading data the performance will
number of disks in the mirror. scale linearly with the number of disks in the mirror.
A common situation is to have 4 disks. When setting it up as 2 mirror vdevs A common situation is to have 4 disks. When setting it up as 2 mirror vdevs
(RAID10) the pool will have the write characteristics as two single disks in (RAID10) the pool will have the write characteristics as two single disks in
regard of IOPS and bandwidth. For read operations it will resemble 4 single regard to IOPS and bandwidth. For read operations it will resemble 4 single
disks. disks.
A 'RAIDZ' of any redundancy level will approximately behave like a single disk A 'RAIDZ' of any redundancy level will approximately behave like a single disk
in regard of 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.
For running VMs, IOPS is the more important metric in most situations. For running VMs, IOPS is the more important metric in most situations.