Creating an EVS Disk

Scenarios

Constraints

• Capacities of multiple disks cannot be combined, and the capacity of a single disk cannot be split.
• You can only attach disks to servers in the same region and AZ. Once a disk is created, the region and AZ cannot be changed.
• There are quantity and capacity quotas on EVS disks, so properly plan the number of disks and total disk capacity your workloads require. For details, see Managing EVS Quotas.
• If you create disks together with the servers, the disks will have the same billing mode as their servers.

Creating Disks On the EVS Console

1. Sign in to the console.
2. Click in the upper left corner and select a region.
3. Click in the upper left corner and choose Storage > Elastic Volume Service.

   The Elastic Volume Service page is displayed.

4. In the upper right corner, click Create Disk.
5. Configure disk parameters according to Table 1.

   Table 1 Disk parameters

   Parameter	Example Value	Description
   Region	-	Mandatory Resources are region-specific and cannot be used across regions through internal network connections. For low network latency and quick resource access, select the nearest region.
   AZ	-	Mandatory The availability zone (AZ) where you want to create the disk.
   Data Source (Optional) Create from backup Create from snapshot Create from image	Create from backup: autobackup-001	Optional Create from backup: The backup data is used to create the disk. Click Create from and choose Backup. On the displayed page, select the target backup and click OK. NOTE: One backup cannot be used for concurrent disk creation operations at the same time. For example, if you are creating disk A from a backup, this backup can only be used to create another disk after disk A has been created. If a disk is created from a backup of a system disk, the new disk can be used as a data disk only. Create from snapshot: The snapshot data is used to create the disk. Click Create from and choose Snapshot. On the displayed page, select the target snapshot and click OK. NOTE: For details about how to create disks from snapshots, see Creating a Disk from a Snapshot. Create from image: The image data is used to create the disk. Click Create from and choose Image. On the displayed page, select the target image and click OK. NOTE: The device type of the new disk is the same as that of the image's source disk. The encryption attribute of the new disk is the same as that of the image's source disk.
   Disk Specifications > Disk Type	Ultra-high I/O	Mandatory EVS disk types vary depending on regions. See the EVS types displayed on the console. For more information about disk types, see Disk Types and Performance.
   Disk Specifications > Capacity (GiB)	100 GiB	Mandatory The disk capacity. You can only create data disks on the current page. The disk capacity ranges from 10 GiB to 32,768 GiB.
   More > Advanced Settings Share SCSI Encryption	-	Optional Share If you select Share, a shared disk will be created. A shared disk can be attached to up to 16 servers. If you do not select Share, a non-shared disk will be created, and the disk can be attached to one server only. If you select both Share and SCSI, a shared SCSI disk will be created. NOTE: The sharing attribute of a disk cannot be changed after the disk is created. For details about shared EVS disks, see Managing Shared EVS Disks. SCSI If you select SCSI, a SCSI disk will be created. Such disks allow the server OS to directly access the underlying storage media and send SCSI commands to the disks. If you do not select SCSI, a VBD disk will be created. That said, the disk device type is VBD, the default device type. NOTE: The device type of a disk cannot be changed after the disk is created. To learn more about the ECS types and OSs supported by SCSI disks and the requirements on the ECS software, see Device Types. Encryption This option is only used to encrypt data disks, and you need to create an agency to grant KMS access permissions to EVS. After the access permissions are granted, configure the KMS key name on the Encryption Setting page displayed: A key name is the identifier of the key, and you can use KMS Key Name to specify a KMS key and use it for encryption. You can select one of the following keys: Default Master Key: After the KMS access permissions are granted to EVS, the system automatically creates a Default Master Key evs/default. CMKs: Existing or newly created CMKs. For details, see section "Key Management Service" > "Creating a Key" in the Data Encryption Workshop User Guide. NOTE: System disk encryption relies on the image. For details, see the Image Management Service User Guide. Before using encryption, you need to create an agency to grant KMS access permissions to EVS. If you have the right to grant the permission, grant KMS access permissions to EVS directly. After KMS access permissions are granted, follow-up operations do not require the permissions to be granted again. If you do not have this permission, contact a user with the security administrator permissions to grant KMS access permissions to EVS, then repeat the preceding operations. The encryption attribute of a disk cannot be changed after the disk has been created.
   More > Tag	-	Optional You can add tags when creating disks. Tags can help you identify, classify, and search for your disks. For details about tag rules, see Adding a Tag. NOTE: Tag rules vary depending on regions. See the rules displayed on the console. Except for tagging the disk during disk creation, you can also add, modify, or delete tags for existing disks. For more information about tags, see Managing EVS Tags.
   Disk Name	Assume that you create two disks and enter volume for Disk Name, the EVS disk names will be volume-0001 and volume-0002.	Mandatory If you create a single disk, the name you entered will be used as the disk name. The value can contain a maximum of 64 characters. If you create multiple disks in a batch, the name you entered will be used as the prefix of disk names. Each disk name will be composed of the name you entered and a four-digit number. The value can contain a maximum of 59 characters.
   Automatic Backup	-	CBR lets you back up EVS disks and ECSs and use the backups to restore data. After you configure automatic backup, the system will associate the EVS disk with the backup vault and apply the selected policy to the vault to periodically back up the disk. Do not use: Skip this configuration if backup is not required. If you need backup protection after a disk has been created, go to the CBR console, locate the desired vault, and associate the disk with the vault. Use existing: Vault: Select an existing vault from the drop-down list. Backup Policy: Select a backup policy from the drop-down list, or go to the CBR console and configure a desired one. Auto assign: Enter a vault name, which can contain a maximum of 64 characters, including letters, digits, underscores (_), and hyphens (-), for example, vault-f61e. The default naming rule is vault_xxxx. Enter a vault capacity for storing disk backups. The vault capacity cannot be less than the size of the disk to be backed up. The value ranges from the disk size to 10,485,760 in the unit of GiB. Select a backup policy from the drop-down list, or go to the CBR console and configure a desired one.
   Enterprise Project	default	Mandatory When creating EVS disks, you can add the disks to an existing enterprise project. An enterprise project facilitates project-level management and grouping of cloud resources and users. The default project is default.
   Quantity	1	Optional The preset disk quantity is 1, which means only one disk will be created. You can create a maximum of 100 disks at a time.

6. Click Next.
7. On the Details page, check the disk configuration.
   • If you do not need to modify the configuration, click Submit.
   • If you need to modify the configuration, click Previous.

8. In the disk list, view the disk status.

   When the disk status changes to Available, the disk is successfully created.