.. kll1552672476085
.. _controller-disk-configurations-for-all-in-one-systems:

=====================================================
Controller Disk Configurations for All-in-one Systems
=====================================================

For |prod| Simplex and Duplex Systems, the controller disk configuration is
highly flexible to support different system requirements for Cinder and
nova-local storage.

You can also change the disk configuration after installation to increase the
persistent volume claim or container-ephemeral storage.

.. _controller-disk-configurations-for-all-in-one-systems-table-h4n-rmg-3jb:

.. table:: Table 1. Disk Configurations for |prod| Simplex or Duplex systems
    :widths: auto

    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+
    | No. of Disks | Disk     | BIOS Boot | Boot      | Root      | Platform File System Volume Group (cgts-vg)   | Root Disk Unallocated Space | Ceph OSD (PVCs)  | Notes                                                                    |
    +==============+==========+===========+===========+===========+===============================================+=============================+===================+=========================================================================+
    | 1            | /dev/sda |           |           |           |                                               |                             |                   | Not supported                                                           |
    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+
    | 2            | /dev/sda | /dev/sda1 | /dev/sda2 | /dev/sda3 | /dev/sda4                                     | Not allocated               | Disk              | Space left unallocated for future application use                       |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdb |           |           |           |                                               |                             |                   | AIO-SX [#fntarg1]_ (replication = 1) ; AIO-DX (replication = 2)         |
    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+
    | 2            | /dev/sda | /dev/sda1 | /dev/sda2 | /dev/sda3 | /dev/sda4                                     | /dev/sda5 (cgts-vg)         | Disk              | Space allocated to cgts-vg to allow filesystem expansion                |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdb |           |           |           |                                               |                             |                   | AIO-SX (replication = 1) ; AIO-DX (replication = 2)                     |
    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+
    | 3            | /dev/sda | /dev/sda1 | /dev/sda2 | /dev/sda3 | /dev/sda4                                     | Not allocated               | Disk              | Space left unallocated for future application use                       |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdb |           |           |           |                                               |                             | Disk              | AIO-SX:superscript:`1:` (replication = 2) ; AIO-DX (replication = 2)    |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdc |           |           |           |                                               |                             |                   | AIO-SX:superscript:`1:` (replication = 2) ; AIO-DX (replication = 2)    |
    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+
    | 3            | /dev/sda | /dev/sda1 | /dev/sda2 | /dev/sda3 | /dev/sda4                                     | /dev/sda5 (cgts-vg)         | Disk              | Space allocated to cgts-vg to allow filesystem expansion                |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdb |           |           |           |                                               |                             | Disk              | AIO-SX:superscript:`1:` (replication = 2) ; AIO-DX (replication = 2)    |
    |              |          |           |           |           |                                               |                             |                   |                                                                         |
    |              | /dev/sdc |           |           |           |                                               |                             |                   | AIO-SX:superscript:`1:` (replication = 2) ; AIO-DX (replication = 2)    |
    +--------------+----------+-----------+-----------+-----------+-----------------------------------------------+-----------------------------+-------------------+-------------------------------------------------------------------------+


.. [#fntarg1]  |AIO|-Simplex Ceph replication is disk-based.