f125a8b892
This change addresses a long-standing issue in rST documentation imported from XML.
That import process added backslash escapes in front of various characters. The three
most common being '(', ')', and '_'.
These instances are removed.
Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: Id43a9337ffcd505ccbdf072d7b29afdb5d2c997e
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.. qhr1552678653880
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.. _add-ssd-backed-journals-using-horizon:
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=====================================
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Add SSD-Backed Journals Using Horizon
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=====================================
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On storage hosts with SSDs or NVMe drives, you can use SSD-backed Ceph
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journals for improved I/O performance.
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.. rubric:: |context|
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If you prefer, you can use the |CLI|. For more information, see :ref:`Add
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SSD-backed Journals Using the CLI
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<add-ssd-backed-journals-using-the-cli>`.
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For more information about SSD-backed journals, see :ref:`Storage on
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Storage Hosts <storage-hosts-storage-on-storage-hosts>`.
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.. rubric:: |prereq|
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A storage host with a solid-state drive (SSD) or Non-Volatile Memory
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Express (NVMe) drive is required.
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To create or edit an SSD-backed journal, you must lock the host. The system
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must have at least two other unlocked hosts with Ceph monitors. (Ceph
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monitors run on **controller-0**, **controller-1**, and **storage-0** only).
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.. rubric:: |proc|
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#. Lock the host to prepare it for configuration changes.
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On the **Hosts** tab of the Host Inventory page, open the drop-down
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list for the host, and then select **Lock Host**.
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The host is locked and reported as **Locked**, **Disabled**, and
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**Online**.
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#. Open the Host Detail page for the host.
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To open the Host Detail page, click the name of the host on the
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**Hosts** tab of the Host Inventory page.
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#. Select the **Storage** tab to view the **Disks** and **Storage Functions** for the host.
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.. image:: /shared/figures/storage/yts1496238000598.png
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#. Assign the SSD to use for Ceph journals.
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.. note::
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This option is available only if the storage host is equipped with
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at least one SSD.
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#. Click **Assign Storage Function** to open the Assign Storage Function dialog box.
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.. image:: /shared/figures/storage/wlx1464876289283.png
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#. In the **Function** field, select Journal.
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A simplified dialog is displayed.
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.. image:: /shared/figures/storage/pzu1464883037926.png
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#. In the **Disks** field, select the SSD device.
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#. Click **Assign Storage Function**.
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The journal function is assigned to the SSD.
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.. image:: /shared/figures/storage/zfd1464884207881.png
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#. Assign the journal function for use by one or more OSDs.
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Use the **Edit** button for the OSD to open the Edit Storage Volume
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dialog box, and then select the **Journal** to use with the OSD.
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.. image:: /shared/figures/storage/eew1464963403075.png
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#. Unlock the host to make it available for use.
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On the **Hosts** tab of the Host Inventory page, open the drop-down
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list for the host, and then select **Unlock Host**.
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The host is rebooted, and its **Availability State** is reported as
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**In-Test**. After a few minutes, it is reported as **Unlocked**,
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**Enabled**, and **Available**.
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