From: Alwin Antreich <a.antreich@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH docs] ceph: add warning for min_size 1
Date: Tue, 27 Oct 2020 18:12:23 +0100 [thread overview]
Message-ID: <20201027171223.3400827-1-a.antreich@proxmox.com> (raw)
Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>
---
pveceph.adoc | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/pveceph.adoc b/pveceph.adoc
index 84a45d5..39da354 100644
--- a/pveceph.adoc
+++ b/pveceph.adoc
@@ -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
--
2.27.0
next reply other threads:[~2020-10-27 17:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 17:12 Alwin Antreich [this message]
2020-10-30 14:35 ` [pve-devel] applied: " Thomas Lamprecht
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