# Replacing Disks in Commvault Grid Nodes

If one or more disks in a Commvault Grid node fail, replace them with new, empty disks. Ransomware protection is automatically enabled on the new disks by default.

Important

- To physically identify a failed drive, look for a drive with an illuminated drive light. When a disk fails, its drive light automatically turns on.

- You must physically replace the failed disks with new disks, and then use the Command Center to replace disks as explained in this document.

To identify and replace faulty disks proactively, see Identifying Replaceable Disks Proactively.

## Before You Begin

Caution

- Before replacing the disk, verify that the disk’s serial number matches the serial number displayed in the IPMI console.
- Do not replace a disk while the node is powered down. The node must be powered on, and the CVFS services (`hedvigswatch`, `hedvighblock`) must be running during disk replacement.
- The disk must be configured as JBOD (not RAID). This is typically automatic, but in some cases, manual configuration may be required.
- Replace the disk physically before you proceed further.

In normal failure scenarios, the LED on a failed disk lights up during failure and turns off once the replacement is complete. If the hardware does not recognize the disk, run the following commands:

1. Identify and turn on the drive light using the steps below. (Steps (a) and (b) are for verification only and do not activate the LED.)

   1. Determine the physical slot for the disk

      `# /usr/local/hedvig/scripts/spm/disk-helper.py --device sd[X] list_slot`

   2. Identify the serial number of the disk.

      `# /usr/local/hedvig/scripts/spm/disk-helper.py --device sd[X] show_serial`

   3. Turn on the drive light to locate the disk.

      `# /usr/local/hedvig/scripts/spm/disk-helper.py --device sd[X] led_on`

   4. To turn off the drive light, run:

      `# /usr/local/hedvig/scripts/spm/disk-helper.py --device sd[X] led_off`

2. Enable root access, if root access is disabled in the storage pool. For more information, see Enabling or Disabling Root Access.

## Procedure

1. The Commvault Grid page appears.

2. In the Name column, click the <storage pool> that has the disk that you want to replace.

   The <storage pool> page appears.

3. On the Nodes tab, click Column Settings () and then click Columns > Actions.

   The Actions column will be displayed.

4. In the node that contains the disk to be replaced, click the Actions button , and then click Replace drives.

   The Confirm replace dialog box is displayed.

5. Verify the MediaAgent name and ensure that it is associated with the node containing the failed disk, and then click Yes.

Note

Replace drives on only one node at a time. After replacing the drives on a node, wait for the HBlock service to come online before proceeding with another node.

## Result

- The new disk appears with the Online status.

- Enable root access, if root access is disabled in the storage pool. For more information, see Enabling or Disabling Root Access.

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