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ceph: add warning for min_size 1

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Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>
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Alwin Antreich 2020-10-27 18:12:23 +01:00 committed by Thomas Lamprecht
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pveceph.adoc
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@ -462,6 +462,10 @@ state.
NOTE: The default number of PGs works for 2-5 disks. Ceph throws a
'HEALTH_WARNING' if you have too few or too many PGs in your cluster.
WARNING: **Do not set a min_size of 1**. A replicated pool with min_size of 1
allows I/O on an object when it has only 1 replica which could lead to data
loss, incomplete PGs or unfound objects.
It is advised to calculate the PG number depending on your setup, you can find
the formula and the PG calculator footnote:[PG calculator
https://ceph.com/pgcalc/] online. From Ceph Nautilus onwards it is possible to