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Merge PR #17373 into master

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* refs/remotes/upstream/pull/17373/head:
	doc/cephfs: add info on using EC pools with CephFS

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
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Patrick Donnelly 2017-09-05 12:48:41 -07:00
commit f0f93c6645
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doc/cephfs/createfs.rst
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@ -2,14 +2,8 @@
Create a Ceph filesystem
========================
.. tip::
The ``ceph fs new`` command was introduced in Ceph 0.84. Prior to this release,
no manual steps are required to create a filesystem, and pools named ``data`` and
``metadata`` exist by default.
The Ceph command line now includes commands for creating and removing filesystems,
but at present only one filesystem may exist at a time.
Creating pools
==============
A Ceph filesystem requires at least two RADOS pools, one for data and one for metadata.
When configuring these pools, you might consider:
@ -29,6 +23,9 @@ might run the following commands:
$ ceph osd pool create cephfs_data <pg_num>
$ ceph osd pool create cephfs_metadata <pg_num>
Creating a filesystem
=====================
Once the pools are created, you may enable the filesystem using the ``fs new`` command:
.. code:: bash
@ -60,3 +57,17 @@ choose which to use when mounting.
.. _Mount CephFS: ../../cephfs/kernel
.. _Mount CephFS as FUSE: ../../cephfs/fuse
Using Erasure Coded pools with CephFS
=====================================
You may use Erasure Coded pools as CephFS data pools as long as they have overwrites enabled, which is done as follows:
.. code:: bash
ceph osd pool set my_ec_pool allow_ec_overwrites true
Note that EC overwrites are only supported when using OSDS with the BlueStore backend.
You may not use Erasure Coded pools as CephFS metadata pools, because CephFS metadata is stored using RADOS *OMAP* data structures, which EC pools cannot store.