Manage storage nodes

Delete a storage node

The procedure to delete a storage node differs depending on the node state (normal or abnormal).

Deleting storage nodes might destroy some VMs. Make sure you have fully understood the potential impact before performing this task.

Delete a normal storage node

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click Delete in the Actions column for a node in normal state.
In the dialog box that opens, click OK.

Delete an abnormal storage node

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click Delete in the Actions column for a node in abnormal state.
In the dialog box that opens, click OK.
In the dialog box that opens, enter the required character string as instructed, and then click OK.
To make sure you can add the node back to the cluster when needed:
1. Delete all roles of the host in the cluster if the host has roles other than the storage node role.
2. Destroy the cluster on the node.
Failure will occur if you attempt to add the node back to the cluster without destroying its cluster settings first. To resolve the issue, contact the technical support.

Enable or disable maintenance mode for a storage node

The maintenance mode is disabled by default. You can place a storage node in maintenance mode for servicing purposes. For example, place a storage node in maintenance mode if you need to replace its hardware components. This action helps avoid data service error or failure during hardware replacement.

If a storage node in maintenance mode powers off, data on the node will not migrate to other nodes. However, data migration that has started before the node enters maintenance mode will continue. After you enable maintenance mode on a storage node, you will be unable to delete the storage node, add disks to or remove disks from the storage node.

Maintenance mode switching might destroy some VMs. Make sure you have fully understood the potential impact before performing this task.
As a best practice, stop all services on a storage node before you enable maintenance mode on a storage node.
If maintenance mode is enabled for a storage node, you cannot enable or disable maintenance mode for a node pool.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click More in the Actions column for a storage node, and then select Maintenance Mode.
Select On or Off to enable or disable maintenance mode for the storage node.
Click OK.

Repair or replace disks on a storage node

Perform this task to repair a faulty disk or replace a failed disk.

Move a disk only between slots on the same storage node. Unpredictable issues might occur if you move a disk between storage nodes.
Synchronize the disk replacement operation to the storage management system after you replace a disk on the host. When you do that, make sure the activity LED on the replacement disk is solid green and the disk status LED is not red or blue.
The disk removed from a storage node contains OSD information. When you insert a replaced disk back to a storage node, you must format that disk immediately after it is inserted. In addition, do not restart the storage node until after the formatting operation is complete. OSD conflict might occur if the storage node reboots before the formatting operation is complete.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click the hostname of a storage node.
Select one or multiple disks that have been physically removed, and then click Replace Disk.
In the dialog box that opens, verify that all replacement requirements are met, and then click OK.
If the system fails to flush the dirty data on some physical or logical disks, the system will display these disks. In this case, you must select all physical and logical disks on the dialog box that opens, and then click OK again.
Select replaced disks and replacement disks:
1. In the Disk Info section, select a physically removed disk, and then select its replacement disk in the Information of Replaceable Disks section.
2. To bulk replace multiple disks, repeat the previous step to select more disks.
The Information of Selected Disks section displays information about the disks you have selected.
To clear all selected replacement disks for disk reselection, click Reset.
Click Next.
In the dialog box that opens, verify disk information, and then click Create.

Update disk information

Perform this task to update information about the disks on a storage node.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click More in the Actions column for a storage node, and then select Update Disk Info.
In the dialog box that opens, click OK.

Correct disk information

Perform this task when the storage system displays incorrect information about the disks on a host.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click More in the Actions column for a storage node, and then select Correct Disk Info.
In the dialog box that opens, click OK.

Edit the description of a storage node

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click More in the Actions column for a storage node, and then select Edit Description.
Edit the node description, and then click OK.

View storage node details

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click Details in the Actions column for a storage node.

Remove disks from a storage node

To remove the only one disk or all disks of a storage node, you must delete the storage node.
Cache disks in a block storage or object storage disk pool cannot be deleted.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click the hostname of a storage node.
Select one or multiple disks, and then click Delete.
In the dialog box that opens, click OK.

Light a disk on a storage node

Perform this task to fast locate a disk.

From the navigation pane, select ONEStor > Host Management.
On the Storage Nodes page, click the hostname of a storage node. You can switch between the disk list of hosts by selecting a host from the dropdown list in the top right corner.
Click Light Disk in the Actions column for a disk.