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Increase Metadata Reserved Space setting

Contributors netapp-lhalbert
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You might be able to increase the Metadata Reserved Space system setting if your Storage Nodes meet specific requirements for RAM and available space.

What you'll need
Note The Grid topology page has been deprecated and will be removed in a future release.
About this task

You might be able to manually increase the system-wide Metadata Reserved Space setting up to 8 TB.

You can only increase the value of the system-wide Metadata Reserved Space setting if both of these statements are true:

  • The Storage Nodes at any site in your system each have 128 GB or more RAM.

  • The Storage Nodes at any site in your system each have sufficient available space on storage volume 0.

Be aware that if you increase this setting, you will simultaneously reduce the space available for object storage on storage volume 0 of all Storage Nodes. For this reason, you might prefer to set the Metadata Reserved Space to a value smaller than 8 TB, based on your expected object metadata requirements.

Note In general, it is better to use a higher value instead of a lower value. If the Metadata Reserved Space setting is too large, you can decrease it later. In contrast, if you increase the value later, the system might need to move object data to free up space.

For a detailed explanation of how the Metadata Reserved Space setting affects the allowed space for object metadata storage on a particular Storage Node, see Manage object metadata storage.

Steps

  1. Determine the current Metadata Reserved Space setting.

    1. Select CONFIGURATION > System > Storage options.

    2. In the Storage watermarks section, note the value of Metadata Reserved Space.

  2. Ensure you have enough available space on storage volume 0 of each Storage Node to increase this value.

    1. Select NODES.

    2. Select the first Storage Node in the grid.

    3. Select the Storage tab.

    4. In the Volumes section, locate the /var/local/rangedb/0 entry.

    5. Confirm that the Available value is equal to or greater than difference between the new value you want to use and the current Metadata Reserved Space value.

      For example, if the Metadata Reserved Space setting is currently 4 TB and you want to increase it to 6 TB, the Available value must be 2 TB or greater.

    6. Repeat these steps for all Storage Nodes.

      • If one or more Storage Nodes do not have enough available space, the Metadata Reserved Space value cannot be increased. Do not continue with this procedure.

      • If each Storage Node has enough available space on volume 0, go to the next step.

  3. Ensure you have at least 128 GB of RAM on each Storage Node.

    1. Select NODES.

    2. Select the first Storage Node in the grid.

    3. Select the Hardware tab.

    4. Hover your cursor over the Memory Usage chart. Ensure that Total Memory is at least 128 GB.

    5. Repeat these steps for all Storage Nodes.

      • If one or more Storage Nodes do not have enough available total memory, the Metadata Reserved Space value cannot be increased. Do not continue with this procedure.

      • If each Storage Node has at least 128 GB of total memory, go to the next step.

  4. Update the Metadata Reserved Space setting.

    1. Select CONFIGURATION > System > Storage options.

    2. Select the Configuration tab.

    3. In the Storage watermarks section, select Metadata Reserved Space.

    4. Enter the new value.

      For example, to enter 8 TB, which is the maximum supported value, enter 8000000000000 (8, followed by 12 zeros)

      Metadata Reserved Space

    5. Select Apply Changes.