normal operation, but rather leave some headroom to cope with outages.
The OSD service itself will use additional memory. The Ceph BlueStore backend of
-the daemon requires by default **3-5 GiB of memory**, b (adjustable).
+the daemon requires by default **3-5 GiB of memory** (adjustable).
.Network
We recommend a network bandwidth of at least 10 Gbps, or more, to be used
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),
+ and communication between the different Ceph services. This setting is
+ required.
+ +
+ Separating your Ceph traffic from the {pve} cluster communication (corosync),
+ and possible the front-facing (public) networks of your virtual guests, 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. This setting is optional.
+ +
+ 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.
+ +
+ The Ceph cluster network can be configured and moved to another physically
+ separated network at a later time.
-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.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alternatively to the the recommended {pve} Ceph installation wizard available
-in the web-interface, you can use the following CLI command on each node:
+in the web interface, you can use the following CLI command on each node:
[source,bash]
----
Create OSDs
~~~~~~~~~~~
-You can create an OSD either via the {pve} web-interface or via the CLI using
+You can create an OSD either via the {pve} web interface or via the CLI using
`pveceph`. For example:
[source,bash]
Create and Edit Pools
~~~~~~~~~~~~~~~~~~~~~
-You can create and edit pools from the command line or the web-interface of any
+You can create and edit pools from the command line or the web interface of any
{pve} host under **Ceph -> Pools**.
When no options are given, we set a default of **128 PGs**, a **size of 3
----
TIP: If you would also like to automatically define a storage for your
-pool, keep the `Add as Storage' checkbox checked in the web-interface, or use the
-command line option '--add_storages' at pool creation.
+pool, keep the `Add as Storage' checkbox checked in the web interface, or use the
+command-line option '--add_storages' at pool creation.
Pool Options
^^^^^^^^^^^^
- xref:pveceph_fs_mds[Setup at least one MDS]
After this is complete, you can simply create a CephFS through
-either the Web GUI's `Node -> CephFS` panel or the command line tool `pveceph`,
+either the Web GUI's `Node -> CephFS` panel or the command-line tool `pveceph`,
for example:
----
* Now make sure that no metadata server (`MDS`) is running for that CephFS,
either by stopping or destroying them. This can be done through the web
- interface or via the command line interface, for the latter you would issue
+ interface or via the command-line interface, for the latter you would issue
the following command:
+
----
are executed.
+[[pveceph_shutdown]]
+Shutdown {pve} + Ceph HCI cluster
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To shut down the whole {pve} + Ceph cluster, first stop all Ceph clients. These
+will mainly be VMs and containers. If you have additional clients that might
+access a Ceph FS or an installed RADOS GW, stop these as well.
+Highly available guests will switch their state to 'stopped' when powered down
+via the {pve} tooling.
+
+Once all clients, VMs and containers are off or not accessing the Ceph cluster
+anymore, verify that the Ceph cluster is in a healthy state. Either via the Web UI
+or the CLI:
+
+----
+ceph -s
+----
+
+To disable all self-healing actions, and to pause any client IO in the Ceph
+cluster, enable the following OSD flags in the **Ceph -> OSD** panel or via the
+CLI:
+
+----
+ceph osd set noout
+ceph osd set norecover
+ceph osd set norebalance
+ceph osd set nobackfill
+ceph osd set nodown
+ceph osd set pause
+----
+
+Start powering down your nodes without a monitor (MON). After these nodes are
+down, continue by shutting down nodes with monitors on them.
+
+When powering on the cluster, start the nodes with monitors (MONs) first. Once
+all nodes are up and running, confirm that all Ceph services are up and running
+before you unset the OSD flags again:
+
+----
+ceph osd unset pause
+ceph osd unset nodown
+ceph osd unset nobackfill
+ceph osd unset norebalance
+ceph osd unset norecover
+ceph osd unset noout
+----
+
+You can now start up the guests. Highly available guests will change their state
+to 'started' when they power on.
+
Ceph Monitoring and Troubleshooting
-----------------------------------
projects / pve-docs.git / blobdiff