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ceph: add more details for private/public network usage and distinction

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2023-11-12 19:00:09 +01:00
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@ -238,24 +238,32 @@ xref:chapter_pmxcfs[configuration file system (pmxcfs)].
The configuration step includes the following settings:
* *Public Network:* You can set up a dedicated network for Ceph. This
setting is required. Separating your Ceph traffic is highly recommended.
Otherwise, it could cause trouble with other latency dependent services,
for example, cluster communication may decrease Ceph's performance.
[[pve_ceph_wizard_networks]]
* *Public Network:* This network will be used for public storage communication
(e.g., for virtual machines using a Ceph RBD backed disk, or a CephFS mount).
This setting is required.
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Separating your Ceph traffic from cluster communication, and possible the
front-facing (public) networks of your virtual gusts, is highly recommended.
Otherwise, Ceph's high-bandwidth IO-traffic could cause interference with
other low-latency dependent services.
[thumbnail="screenshot/gui-node-ceph-install-wizard-step2.png"]
* *Cluster Network:* As an optional step, you can go even further and
separate the xref:pve_ceph_osds[OSD] replication & heartbeat traffic
as well. This will relieve the public network and could lead to
significant performance improvements, especially in large clusters.
* *Cluster Network:* Specify to separate the xref:pve_ceph_osds[OSD] replication
and heartbeat traffic as well.
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Using a physically separated network is recommended, as it will relieve the
Ceph public and the virtual guests network, while also providing a significant
Ceph performance improvements.
You have two more options which are considered advanced and therefore
should only changed if you know what you are doing.
You have two more options which are considered advanced and therefore should
only changed if you know what you are doing.
* *Number of replicas*: Defines how often an object is replicated
* *Minimum replicas*: Defines the minimum number of required replicas
for I/O to be marked as complete.
* *Number of replicas*: Defines how often an object is replicated.
* *Minimum replicas*: Defines the minimum number of required replicas for I/O to
be marked as complete.
Additionally, you need to choose your first monitor node. This step is required.