.. qhr1552678653880
.. _add-ssd-backed-journals-using-horizon:

=====================================
Add SSD-Backed Journals Using Horizon
=====================================

On storage hosts with SSDs or NVMe drives, you can use SSD-backed Ceph
journals for improved I/O performance.

.. rubric:: |context|

If you prefer, you can use the |CLI|. For more information, see :ref:`Add
SSD-backed Journals Using the CLI
<add-ssd-backed-journals-using-the-cli>`.

For more information about SSD-backed journals, see :ref:`Storage on
Storage Hosts <storage-hosts-storage-on-storage-hosts>`.

.. rubric:: |prereq|

A storage host with a solid-state drive \(SSD\) or Non-Volatile Memory
Express \(NVMe\) drive is required.

To create or edit an SSD-backed journal, you must lock the host. The system
must have at least two other unlocked hosts with Ceph monitors. \(Ceph
monitors run on **controller-0**, **controller-1**, and **storage-0** only\).

.. rubric:: |proc|

#.  Lock the host to prepare it for configuration changes.

    On the **Hosts** tab of the Host Inventory page, open the drop-down
    list for the host, and then select **Lock Host**.

    The host is locked and reported as **Locked**, **Disabled**, and
    **Online**.

#.  Open the Host Detail page for the host.

    To open the Host Detail page, click the name of the host on the
    **Hosts** tab of the Host Inventory page.

#.  Select the **Storage** tab to view the **Disks** and **Storage Functions** for the host.

    .. image:: /shared/figures/storage/yts1496238000598.png

#.  Assign the SSD to use for Ceph journals.

    .. note::
        This option is available only if the storage host is equipped with
        at least one SSD.

    #.  Click **Assign Storage Function** to open the Assign Storage Function dialog box.

        .. image:: /shared/figures/storage/wlx1464876289283.png


    #.  In the **Function** field, select Journal.

        A simplified dialog is displayed.

        .. image:: /shared/figures/storage/pzu1464883037926.png


    #.  In the **Disks** field, select the SSD device.

    #.  Click **Assign Storage Function**.

        The journal function is assigned to the SSD.

        .. image:: /shared/figures/storage/zfd1464884207881.png

#.  Assign the journal function for use by one or more OSDs.

    Use the **Edit** button for the OSD to open the Edit Storage Volume
    dialog box, and then select the **Journal** to use with the OSD.

    .. image:: /shared/figures/storage/eew1464963403075.png

#.  Unlock the host to make it available for use.

    On the **Hosts** tab of the Host Inventory page, open the drop-down
    list for the host, and then select **Unlock Host**.

    The host is rebooted, and its **Availability State** is reported as
    **In-Test**. After a few minutes, it is reported as **Unlocked**,
    **Enabled**, and **Available**.