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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
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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]. http://docs.ceph.com/docs/luminous/start/hardware-recommendations/[Ceph's website].
.Avoid RAID .Avoid RAID
While RAID controller are build for storage virtualisation, to combine As Ceph handles data object redundancy and multiple parallel writes to disks
independent disks to form one or more logical units. Their caching methods, (OSDs) on its own, using a RAID controller normally doesn’t improves
algorithms (RAID modes; incl. JBOD), disk or write/read optimisations are performance or availability. On the contrary, Ceph is designed to handle whole
targeted towards aforementioned logical units and not to Ceph. 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. WARNING: Avoid RAID controller, use host bus adapter (HBA) instead.