[pve-devel] [PATCH docs 4/7] pvecm: extend cluster Requirements

[Aaron Lauterer <a.lauterer@proxmox.com>]

by expanding on best practices with background information as to how and
why.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---
 pvecm.adoc | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/pvecm.adoc b/pvecm.adoc
index 3b9cfc4..c50ec15 100644
--- a/pvecm.adoc
+++ b/pvecm.adoc
@@ -68,9 +68,24 @@ Requirements
 * If you are interested in High Availability, you need to have at
   least three nodes for reliable quorum. All nodes should have the
   same version.
++
+NOTE: For smaller 2-node clusters, the xref:_corosync_external_vote_support[QDevice]
+can be used to provide a 3rd vote.
 
-* We recommend a dedicated NIC for the cluster traffic, especially if
-  you use shared storage.
+* We recommend a dedicated physical NIC for the cluster traffic.
++
+NOTE: The {pve} cluster communication uses the Corosync protocol. It needs consistent
+low latency but not a lot of bandwidth. A dedicated 1 Gbit NIC is enough in
+most situations. It helps to avoid situations where other services can use up
+all the available bandwidth. Which in turn would increase the latency for the
+Corosync packets.
+
+* Configuring additional links for the cluster traffic can help in situations where
+  the dedicated network is down.
++
+NOTE: The Corosync protocol used for the {pve} cluster communication can
+switch between multiple networks by itself and does not rely on a bonded network
+for redundancy. You can configure up to 8 networks to be used by Corosync.
 
 * The root password of a cluster node is required for adding nodes.
 
-- 
2.39.5



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