Block Device

The Block Device page allows you to manage Ceph RADOS Block Devices (RBD). RBDs are block-based storage devices that are striped across the cluster, providing high-performance and reliable storage for virtual machines, containers, and other applications.

Statistics Overview

At the top of the page, you will find a dashboard summarizing the state of RBD images stored in the cluster:

Image

The total number of RADOS Block Device (RBD) images currently stored across all pools.

Usage

Displays the aggregated storage usage of all block device images, including total used capacity and total provisioned quota.

Introduction

The Block Device page displays a list of all RBD images. The table includes the following information:

Column	Description
Name	The name of the block device image.
Pool Name	The storage pool where the image is stored.
Usage	A progress bar showing the storage capacity usage (Used Space / Quota Size).
Snapshots	The number of snapshots taken of this block device. Clicking the external link icon opens a detailed view of the snapshots.

Create Block Device

You can create new block devices to provide storage for your applications.

1. Click the Create button.
2. Image Name: Enter a unique name for the block device.
3. Pool Name: Select the storage pool to host the image.
4. Quota Size: Specify the size of the block device (e.g., 100 GB).
5. Advanced Settings (Optional):
   • Striping: Configure Object Size, Stripe Unit, and Stripe Count to optimize performance for specific workloads.
   • Features: Enable or disable RBD features like Layering, Exclusive Lock, Object Map, Fast Diff, and Deep Flatten.
6. Click Confirm to create the block device.

Manage Block Devices

You can modify or delete existing block devices using the Actions menu.

Edit Block Device

Allows you to expand or shrink the block device.

Danger

Shrinking is irreversible. Ensure that you have backed up any critical data.

1. Select Edit from the actions menu (pencil icon).
2. Update the Quota Size to increase the device size.
3. Click Confirm to save changes.

Delete Block Device

Permanently removes a block device and all its data.

1. Select Delete from the actions menu (trash icon).
2. Type the name of the image to confirm deletion.
3. Click Confirm to permanently delete the block device.

Danger

Deleting a block device is irreversible. Ensure that the device is not mounted or in use by any application and that you have backed up any critical data.

Manage Snapshots

Snapshots provide a read-only copy of the block device state at a specific point in time. You can view and manage snapshots by clicking the external link icon in the Snapshots column.

Snapshot List

The snapshot list displays the following information:

Column	Description
Name	The name of the snapshot.
Protect	Indicates whether the snapshot is protected from deletion.
Usage	A progress bar showing the storage usage of the snapshot.

Snapshot Actions

The Actions menu for each snapshot provides the following options:

• Rollback: Reverts the block device to the state captured in the snapshot. Note: This will discard any changes made since the snapshot was taken.
• Protect: Prevents the snapshot from being deleted. Useful for critical backups.
• Unprotect: Removes the protection, allowing the snapshot to be deleted.
• Delete: Permanently removes the snapshot.