mirror of https://github.com/ceph/ceph-ansible.git
doc: update osd scenario
This commits adds documentation for the lvm scenario and the deprecation
of collocated and non-collocated scenario.
Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit f8e1542423)
pull/3857/head
Sébastien Han
mergify[bot]
parent
343a99c8b7
commit
d6d2a3b040
|
|
@ -1,21 +1,25 @@
|
|||
OSD Scenarios
|
||||
=============
|
||||
OSD Scenario
|
||||
============
|
||||
|
||||
There are a few *scenarios* that are supported and the differences are mainly
|
||||
based on the Ceph tooling required to provision OSDs, but can also affect how
|
||||
devices are being configured to create an OSD.
|
||||
As of stable-3.2, the following scenarios are not supported anymore since they are associated to ``ceph-disk``:
|
||||
|
||||
* `collocated`
|
||||
* `non-collocated`
|
||||
|
||||
``ceph-disk`` was deprecated during the ceph-ansible 3.2 cycle and has been removed entirely from Ceph itself in the Nautilus version.
|
||||
Supported values for the required ``osd_scenario`` variable are:
|
||||
|
||||
* :ref:`collocated <osd_scenario_collocated>`
|
||||
* :ref:`non-collocated <osd_scenario_non_collocated>`
|
||||
At present (starting from stable-3.2), there is only one scenario, which defaults to ``lvm``, see:
|
||||
|
||||
* :ref:`lvm <osd_scenario_lvm>`
|
||||
|
||||
Since the Ceph mimic release, it is preferred to use the :ref:`lvm scenario
|
||||
So there is no need to configure ``osd_scenario`` anymore, it defaults to ``lvm``.
|
||||
|
||||
Since the Ceph luminous release, it is preferred to use the :ref:`lvm scenario
|
||||
<osd_scenario_lvm>` that uses the ``ceph-volume`` provisioning tool. Any other
|
||||
scenario will cause deprecation warnings.
|
||||
|
||||
All the scenarios mentionned above support both containerized and non-containerized cluster.
|
||||
The ``lvm`` scenario mentionned above support both containerized and non-containerized cluster.
|
||||
As a reminder, deploying a containerized cluster can be done by setting ``containerized_deployment``
|
||||
to ``True``.
|
||||
|
||||
|
|
@ -234,185 +238,4 @@ Supported ``lvm_volumes`` configuration settings:
|
|||
journal: journal-lv2
|
||||
journal_vg: journal-vg2
|
||||
|
||||
.. note:: Volume groups and logical volumes must exist.
|
||||
|
||||
|
||||
.. _osd_scenario_collocated:
|
||||
|
||||
collocated
|
||||
----------
|
||||
|
||||
.. warning:: This scenario is deprecated in the Ceph mimic release, and fully
|
||||
removed in newer releases. It is recommended to used the
|
||||
:ref:`lvm scenario <osd_scenario_lvm>` instead
|
||||
|
||||
This OSD scenario uses ``ceph-disk`` to create OSDs with collocated journals
|
||||
from raw devices.
|
||||
|
||||
Use ``osd_scenario: collocated`` to enable this scenario. This scenario also
|
||||
has the following required configuration options:
|
||||
|
||||
- ``devices``
|
||||
|
||||
This scenario has the following optional configuration options:
|
||||
|
||||
- ``osd_objectstore``: defaults to ``filestore`` if not set. Available options are ``filestore`` or ``bluestore``.
|
||||
You can only select ``bluestore`` if the Ceph release is luminous or greater.
|
||||
|
||||
- ``dmcrypt``: defaults to ``false`` if not set.
|
||||
|
||||
This scenario supports encrypting your OSDs by setting ``dmcrypt: True``.
|
||||
|
||||
If ``osd_objectstore: filestore`` is enabled both 'ceph data' and 'ceph journal' partitions
|
||||
will be stored on the same device.
|
||||
|
||||
If ``osd_objectstore: bluestore`` is enabled 'ceph data', 'ceph block', 'ceph block.db', 'ceph block.wal' will be stored
|
||||
on the same device. The device will get 2 partitions:
|
||||
|
||||
- One for 'data', called 'ceph data'
|
||||
|
||||
- One for 'ceph block', 'ceph block.db', 'ceph block.wal' called 'ceph block'
|
||||
|
||||
Example of what you will get:
|
||||
|
||||
.. code-block:: console
|
||||
|
||||
[root@ceph-osd0 ~]# blkid /dev/sda*
|
||||
/dev/sda: PTTYPE="gpt"
|
||||
/dev/sda1: UUID="9c43e346-dd6e-431f-92d8-cbed4ccb25f6" TYPE="xfs" PARTLABEL="ceph data" PARTUUID="749c71c9-ed8f-4930-82a7-a48a3bcdb1c7"
|
||||
/dev/sda2: PARTLABEL="ceph block" PARTUUID="e6ca3e1d-4702-4569-abfa-e285de328e9d"
|
||||
|
||||
An example of using the ``collocated`` OSD scenario with encryption would look like:
|
||||
|
||||
.. code-block:: yaml
|
||||
|
||||
osd_scenario: collocated
|
||||
dmcrypt: true
|
||||
devices:
|
||||
- /dev/sda
|
||||
- /dev/sdb
|
||||
|
||||
|
||||
.. _osd_scenario_non_collocated:
|
||||
|
||||
non-collocated
|
||||
--------------
|
||||
|
||||
.. warning:: This scenario is deprecated in the Ceph mimic release, and fully
|
||||
removed in newer releases. It is recommended to used the
|
||||
:ref:`lvm scenario <osd_scenario_lvm>` instead
|
||||
|
||||
This OSD scenario uses ``ceph-disk`` to create OSDs from raw devices with journals that
|
||||
exist on a dedicated device.
|
||||
|
||||
Use ``osd_scenario: non-collocated`` to enable this scenario. This scenario also
|
||||
has the following required configuration options:
|
||||
|
||||
- ``devices``
|
||||
|
||||
This scenario has the following optional configuration options:
|
||||
|
||||
- ``dedicated_devices``: defaults to ``devices`` if not set
|
||||
|
||||
- ``osd_objectstore``: defaults to ``filestore`` if not set. Available options are ``filestore`` or ``bluestore``.
|
||||
You can only select ``bluestore`` with the Ceph release is luminous or greater.
|
||||
|
||||
- ``dmcrypt``: defaults to ``false`` if not set.
|
||||
|
||||
This scenario supports encrypting your OSDs by setting ``dmcrypt: True``.
|
||||
|
||||
If ``osd_objectstore: filestore`` is enabled 'ceph data' and 'ceph journal' partitions
|
||||
will be stored on different devices:
|
||||
- 'ceph data' will be stored on the device listed in ``devices``
|
||||
- 'ceph journal' will be stored on the device listed in ``dedicated_devices``
|
||||
|
||||
Let's take an example, imagine ``devices`` was declared like this:
|
||||
|
||||
.. code-block:: yaml
|
||||
|
||||
devices:
|
||||
- /dev/sda
|
||||
- /dev/sdb
|
||||
- /dev/sdc
|
||||
- /dev/sdd
|
||||
|
||||
And ``dedicated_devices`` was declared like this:
|
||||
|
||||
.. code-block:: yaml
|
||||
|
||||
dedicated_devices:
|
||||
- /dev/sdf
|
||||
- /dev/sdf
|
||||
- /dev/sdg
|
||||
- /dev/sdg
|
||||
|
||||
This will result in the following mapping:
|
||||
|
||||
- ``/dev/sda`` will have ``/dev/sdf1`` as journal
|
||||
|
||||
- ``/dev/sdb`` will have ``/dev/sdf2`` as a journal
|
||||
|
||||
- ``/dev/sdc`` will have ``/dev/sdg1`` as a journal
|
||||
|
||||
- ``/dev/sdd`` will have ``/dev/sdg2`` as a journal
|
||||
|
||||
|
||||
If ``osd_objectstore: bluestore`` is enabled, both 'ceph block.db' and 'ceph block.wal' partitions will be stored
|
||||
on a dedicated device.
|
||||
|
||||
So the following will happen:
|
||||
|
||||
- The devices listed in ``devices`` will get 2 partitions, one for 'block' and one for 'data'. 'data' is only 100MB
|
||||
big and do not store any of your data, it's just a bunch of Ceph metadata. 'block' will store all your actual data.
|
||||
|
||||
- The devices in ``dedicated_devices`` will get 1 partition for RocksDB DB, called 'block.db' and one for RocksDB WAL, called 'block.wal'
|
||||
|
||||
By default ``dedicated_devices`` will represent block.db
|
||||
|
||||
Example of what you will get:
|
||||
|
||||
.. code-block:: console
|
||||
|
||||
[root@ceph-osd0 ~]# blkid /dev/sd*
|
||||
/dev/sda: PTTYPE="gpt"
|
||||
/dev/sda1: UUID="c6821801-2f21-4980-add0-b7fc8bd424d5" TYPE="xfs" PARTLABEL="ceph data" PARTUUID="f2cc6fa8-5b41-4428-8d3f-6187453464d0"
|
||||
/dev/sda2: PARTLABEL="ceph block" PARTUUID="ea454807-983a-4cf2-899e-b2680643bc1c"
|
||||
/dev/sdb: PTTYPE="gpt"
|
||||
/dev/sdb1: PARTLABEL="ceph block.db" PARTUUID="af5b2d74-4c08-42cf-be57-7248c739e217"
|
||||
/dev/sdb2: PARTLABEL="ceph block.wal" PARTUUID="af3f8327-9aa9-4c2b-a497-cf0fe96d126a"
|
||||
|
||||
There is more device granularity for Bluestore ONLY if ``osd_objectstore: bluestore`` is enabled by setting the
|
||||
``bluestore_wal_devices`` config option.
|
||||
|
||||
By default, if ``bluestore_wal_devices`` is empty, it will get the content of ``dedicated_devices``.
|
||||
If set, then you will have a dedicated partition on a specific device for block.wal.
|
||||
|
||||
Example of what you will get:
|
||||
|
||||
.. code-block:: console
|
||||
|
||||
[root@ceph-osd0 ~]# blkid /dev/sd*
|
||||
/dev/sda: PTTYPE="gpt"
|
||||
/dev/sda1: UUID="39241ae9-d119-4335-96b3-0898da8f45ce" TYPE="xfs" PARTLABEL="ceph data" PARTUUID="961e7313-bdb7-49e7-9ae7-077d65c4c669"
|
||||
/dev/sda2: PARTLABEL="ceph block" PARTUUID="bff8e54e-b780-4ece-aa16-3b2f2b8eb699"
|
||||
/dev/sdb: PTTYPE="gpt"
|
||||
/dev/sdb1: PARTLABEL="ceph block.db" PARTUUID="0734f6b6-cc94-49e9-93de-ba7e1d5b79e3"
|
||||
/dev/sdc: PTTYPE="gpt"
|
||||
/dev/sdc1: PARTLABEL="ceph block.wal" PARTUUID="824b84ba-6777-4272-bbbd-bfe2a25cecf3"
|
||||
|
||||
An example of using the ``non-collocated`` OSD scenario with encryption, bluestore and dedicated wal devices would look like:
|
||||
|
||||
.. code-block:: yaml
|
||||
|
||||
osd_scenario: non-collocated
|
||||
osd_objectstore: bluestore
|
||||
dmcrypt: true
|
||||
devices:
|
||||
- /dev/sda
|
||||
- /dev/sdb
|
||||
dedicated_devices:
|
||||
- /dev/sdc
|
||||
- /dev/sdc
|
||||
bluestore_wal_devices:
|
||||
- /dev/sdd
|
||||
- /dev/sdd
|
||||
.. note:: Volume groups and logical volumes must exist.
|
||||
Loading…
Reference in New Issue