Configuring new disks manually

Prerequisites

• The failed disk is released, as described in Releasing node disks, and the new disk for replacement is connected to the node.

To manually assign roles to a new disk

1. On the Infrastructure > Nodes screen, click the name of the node to configure.
2. Go to the Disks tab.

3. Select the unassigned disk and click Assign.

   

4. On the Choose role screen, select a role:

   • If you want to use the disk to store chunks and run a storage service on the node, select Storage, and then select one of the following:

     • Use SSD for caching and checksumming. Available and recommended only for nodes with SSDs.
     • Enable checksumming (default). Recommended for nodes with HDDs as it provides better reliability.
     • Disable checksumming. Not recommended for production. For an evaluation or testing environment, you can disable checksumming for nodes with HDDs, to provide better performance.

     Then, select a tier. To make better use of data redundancy, do not assign all of the disks on a node to the same tier. Instead, make sure that each tier is evenly distributed across the cluster with only one disk per node assigned to it.

   • If you want to use the disk to store metadata and run a metadata service on the node, select Metadata. It is recommended to have only one metadata service per node.
   • (Only for SSD drives) If you want to use the disk to store the write cache, select Cache. To cache a specific storage tier, select it from the list. Otherwise, all tiers will be cached.
   • (Only for SSD drives) If you want to use the disk to store both metadata and the write cache, select Metadata+Cache.

   

5. Click Done.