Manage storage nodes

Storage node management provides the following features:

• Displaying storage node information.

• Displaying disk information for storage nodes.

A disk in the system can be in normal, abnormal, not configured with RAID, or unused state. A disk is displayed as not used if it has been configured with RAID 0 but is not in use. A disk is displayed as not configured with RAID if it is not configured with RAID 0. To view the lifespan of a SATA SSD, check the remaining lifespan of the SSD on the LSI RAID controller that manages the SSD.

• Adding and removing disks for storage nodes.

The system can automatically discover disks newly added to the storage nodes. To use the newly discovered disks, you must manually add them as data disks to disk pools. You can add disks as data disks to disk pools only when they are not used or not configured with RAID. When you add or remove data disks for a disk pool, the disk pool automatically rebalances data across its data disks.

The type of data disks you can add to a disk pool depends on the disk pool mode.

• SSD Caches+HDDs mode—You can add only HDDs as data disks.

• All SSDs mode—You can add only SSDs as data disks.

• All HDDs mode—You can add only HDDs as data disks.

• Turning on or off disk LED locators.

• Deleting RAID settings of unused disks.

• Configuring RAID settings for unconfigured disks.

• Synchronizing disk information.

Perform this task when a disk is added to or removed from a server to synchronize information about unused, unconfigured, or removed disks on servers to UIS. Then, you can view all disks on all storage nodes in UIS.

• Disabling data balancing on storage nodes.

You can disable data balancing on a storage node when you replace its hardware, such as the CPU, memory, power supply, or fan. After the storage node is powered off, the storage cluster does not identify the storage node as an abnormal node or migrate its data to other nodes, and disabling data balancing does not interrupt ongoing data migration. You cannot delete the storage node or add or remove disks for it. As a best practice, stop all services on a storage node before you disable data balancing on it.

• Enabling data balancing on storage nodes.

• After you enable data balancing on a storage node, it resumes data synchronization in its storage cluster.

Restrictions and guidelines

• You can delete disks only when the data health score is 100, which indicates that data is balanced in the storage cluster.

• You cannot configure or delete RAID settings for NVMe disks in UIS.

• You cannot turn on the disk locators of NVMe disks on the storage node management page. You can turn on the disk locator of only one NVMe disk for each host on the Hot Key > Health Check > Physical Disk State page.

• The disk usage, interface type, location, RAID controller, and disk locator state fields all display -- for NVMe disks.

View information about storage nodes

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. On the Storage Nodes tab, view information about the nodes.

View information about the disks on a storage node

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. On the Storage Nodes tab, select a storage node. The bottom disk list displays information about the disks in the node.

Add or remove disks to or from the storage cluster

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. On the Storage Nodes tab, select a storage node.

3. To add a disk to the cluster, click the Configure icon  for the disk you are adding, which must be one that is not used or configured with RAID. In the dialog box that opens, select a disk pool, and then click OK.

4. To remove a disk from the cluster, click the Delete icon  for a disk. In the dialog box that opens, click OK.

Turn on or turn off a disk locator

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Select a storage node.

3. To turn on the locator of a disk, click the  icon for the disk, and then click OK in the dialog box that opens.

4. To turn off the locator of a disk, click the  icon for the disk, and then click OK in the dialog box that opens.

Delete RAID settings for a disk

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Select a storage node.

3. Click the  icon for a disk, and then click OK in the dialog box that opens.

Configure RAID settings for disk

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Select a storage node.

3. Click the  icon for a disk, and then click OK in the dialog box that opens.

Synchronize disk information

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Click Sync Disks.

Disable data balancing on a storage node

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Select a storage node, and then click Disable Data Balancing.

3. Click OK in the dialog box that opens.

4. Enter CONFIRM in the dialog box that opens, and then click OK.

Enable data balancing on a storage node

1. On the top navigation bar, click Cloud Resources, and then select Storage > Distributed > Nodes from the navigation pane.

2. Select a storage node, and then click Enable Data Balancing.

3. Click OK in the dialog box that opens.