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pveceph: reword RAID paragraph

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The "While ..." sentence seemed unfinished, reword paragraph

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2018-07-05 18:22:22 +02:00
parent 04ba9b2466
commit 86be506d85
1 changed files with 7 additions and 4 deletions
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@ -81,10 +81,13 @@ Check also the recommendations from
http://docs.ceph.com/docs/luminous/start/hardware-recommendations/[Ceph's website].
.Avoid RAID
While RAID controller are build for storage virtualisation, to combine
independent disks to form one or more logical units. Their caching methods,
algorithms (RAID modes; incl. JBOD), disk or write/read optimisations are
targeted towards aforementioned logical units and not to Ceph.
As Ceph handles data object redundancy and multiple parallel writes to disks
(OSDs) on its own, using a RAID controller normally doesn’t improves
performance or availability. On the contrary, Ceph is designed to handle whole
disks on it's own, without any abstraction in between. RAID controller are not
designed for the Ceph use case and may complicate things and sometimes even
reduce performance, as their write and caching algorithms may interfere with
the ones from Ceph.
WARNING: Avoid RAID controller, use host bus adapter (HBA) instead.