Änderungen von Dokument Ceph

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1	1	We offer [Ceph](https://ceph.io) as a scalable and fast way to obtain storage for your needs.
2		-
3		-{{toc/}}
4		-
5		-## How does it work?
6		-
7		-The gist how Ceph works for you:
8		-We have many servers with SSDs or HDDs, each bought by one organization unit such as a chair. Data is spread accross all servers, and each organization unit gets as much storage space as they bought in servers.
9		-
10		-You can access the storage mainly via RBD (RADOS block device), which is a device behaving like a local disk (USB stick, SSD, ...), but actually stores and retrieves data from the cluster in our data centre.
11		-
12		-## RBD acquisition
13		-
14		-An RBD is a **storage device** you can use in your servers to store data in our Ceph cluster. It either uses **HDD** or **SSD** storage (cheaper vs faster).
15		-
16		-For evaluation purposes, you can get small amounts of storage directly.
17		-Otherwise, you can get as much space as you are entitled to.
18		-
19		-Each RBD is stored in a "namespace", which **restricts access** to it. You can have multiple RBDs in the same namespace.
20		-
21		-The name of an RBD is `ORG-name/namespacename/rbdname.`
22		-
23		-To request the creation (or extension) of an RBD, write to [[support@ito.cit.tum.de|mailto:support@ito.cit.tum.de]] specifying **name**, **size**, **namespace** and **HDD/SSD**.
24		-
25		-You will get back a secret **keyring** to access the namespace.
26		-
27		-## RBD mapping
28		-
29		-In order to "use" an RBD in your server, you need to "map" it.
30		-
31		-You should have ready the name and keyring of the RBD.
32		-
33		-* Please install `ceph-common`, at least in version 15.
34		- * It contains a tool named `rbdmap`, which can (oh wonder) map your RBD.
35		-* Edit /etc/ceph/rbdmap to add your RBD in a line
36		- * it has the format: `rbdname name=keyringname,options=...`
37		- * `ORG-name/namespacename/rbdname name=client.ORG.rbd.namespacename,options='queue_depth=1024'`
38		-* Place the keyring file in /etc/ceph/
39		- * Filename: `ceph.client.ORG.rbd.namespacename.keyring`
40		- * Permissions: 700
41		- * Owner: root
42		- * Content: the client identifier and 28 byte key in base64 encoding.
43		- * [client.ORG.rbd.namespacename]
44		- key = ASD+OdlsdoTQJxFFljfCDEf/ASDFlYIbEbZatg==
45		-
46		-## RBD formatting
47		-
48		-Now that you have mapped your RBD, we can create file system structures on it.