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pveceph: improve intro

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Dietmar Maurer 2017-06-28 10:56:42 +02:00
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pveceph.adoc
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@ -22,10 +22,23 @@ pveceph - Manage Ceph Services on Proxmox VE Nodes
==================================================
endif::manvolnum[]
It is possible to install the {ceph} storage server directly on the
Proxmox VE cluster nodes. The VMs and Containers can access that
storage using the xref:ceph_rados_block_devices[Ceph RADOS Block Devices (RBD)]
storage driver.
{pve} unifies your compute and storage systems, i.e. you can use the
same physical nodes within a cluster for both computing (processing
VMs and containers) and replicated storage. The traditional silos of
compute and storage resources can be wrapped up into a single
hyper-converged appliance. Separate storage networks (SANs) and
connections via network (NAS) disappear. With the integration of Ceph,
an open source software-defined storage platform, {pve} has the
ability to run and manage Ceph storage directly on the hypervisor
nodes.
Ceph is a distributed object store and file system designed to provide
excellent performance, reliability and scalability. For smaller
deployments, it is possible to install a Ceph server for RADOS Block
Devices (RBD) directly on your {pve} cluster nodes, see
xref:ceph_rados_block_devices[Ceph RADOS Block Devices (RBD)]. Recent
hardware has plenty of CPU power and RAM, so running storage services
and VMs on the same node is possible.
To simplify management, we provide 'pveceph' - a tool to install and
manage {ceph} services on {pve} nodes.
@ -34,13 +47,12 @@ manage {ceph} services on {pve} nodes.
Precondition
------------
There should be at least three (preferably) identical servers for
setup which build together a Proxmox Cluster.
A 10Gb network is recommmended, exclusively used for Ceph. If there
are no 10Gb switches available meshed network is also an option, see
{webwiki-url}Full_Mesh_Network_for_Ceph_Server[wiki].
To build a Proxmox Ceph Cluster there should be at least three (preferably)
identical servers for the setup.
A 10Gb network, exclusively used for Ceph, is recommmended. A meshed
network setup is also an option if there are no 10Gb switches
available, see {webwiki-url}Full_Mesh_Network_for_Ceph_Server[wiki] .
Check also the recommendations from
http://docs.ceph.com/docs/jewel/start/hardware-recommendations/[Ceph's website].
@ -73,7 +85,7 @@ pveceph init --network 10.10.10.0/24
----
This creates an initial config at `/etc/pve/ceph.conf`. That file is
automatically distributed to all Proxmox VE nodes by using
automatically distributed to all {pve} nodes by using
xref:chapter_pmxcfs[pmxcfs]. The command also creates a symbolic link
from `/etc/ceph/ceph.conf` pointing to that file. So you can simply run
Ceph commands without the need to specify a configuration file.