Create an EVS Disk

Scenarios

EVS disks can be used as system disks or data disks for servers. You can create data disks on the EVS console, or create them together with system disks on the ECS console.

This section describes how to create data disks on the EVS console.

Constraints

Procedure

1. Log in to the management console.
2. Under Storage, click Elastic Volume Service.

   The disk list page is displayed.

3. Click Create Disk.
4. Configure basic disk information according to Table 2.

   Table 2 Disk parameters

   Parameter	Sub-Parameter	Description	Example Value
   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. NOTE: Disks can only be attached to the servers in the same AZ. The AZ of a disk cannot be changed after the disk has been created.	-
   Disk Specifications	Disk Type	Mandatory The available disk types are as follows: High I/O Ultra-high I/O NOTE: When a disk is created from a snapshot, the disk type of the new disk will be consistent with that of the snapshot's source disk.	Ultra-high I/O
   	Disk Size (GiB)	Mandatory The disk size. Only data disks can be created on the current page, and the disk size ranges from 10 GiB to 32,768 GiB. NOTE: When you use a backup to create a disk, the disk capacity must be greater than or equal to the backup size. In the condition that you do not specify the disk capacity, if the backup size is smaller than 10 GiB, the default capacity 10 GiB will be used as the disk capacity; if the backup size is greater than 10 GiB, the disk capacity will be consistent with the backup size. When you use a snapshot to create a disk, the disk capacity must be greater than or equal to the snapshot size. In the condition that you do not specify a disk capacity, if the snapshot size is smaller than 10 GiB, the default 10 GiB will be used as the disk capacity; if the snapshot size is greater than 10 GiB, the disk capacity will be consistent with the snapshot size.	100 GiB
   Data Source (Optional)	Create from Backup Snapshot	Optional If you choose 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 be used to create another disk only 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. If you choose 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: The device type of the new disk is the same as that of the snapshot's source disk. For details about the disk creation from snapshots, see Creating an EVS Disk from a Snapshot.	Create from Backup: autobackup-001
   More	Advanced Settings Share SCSI Encryption	Optional Share If you select Share, a shared disk is created. A shared disk can be attached to up to 16 servers. If you do not select Share, a non-shared disk is created, and the disk can be attached to one a server only. If you select both SCSI and Share, a shared SCSI disk is created. NOTE: The sharing attribute of a disk cannot be changed after the disk has been created. For details about shared EVS disks, see Managing Shared EVS Disks. SCSI If you select SCSI, a SCSI disk is 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 is 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 has been created. For details about the ECS types, OSs, and ECS software supported by SCSI EVS disks, see Device Types and Usage Instructions. Encryption This option is only used to encrypt data disks, and you need to create an agency to grant KMS access rights to EVS. After the access rights are granted, configure the following parameters on the Encryption Settings page displayed: KMS Key Name KMS 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. One of the following keys can be used: Default Master Key: After the KMS access rights have been granted to EVS, the system automatically creates a Default Master Key evs/default. Existing or newly created CMKs. For details, see "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 you use the encryption function, you need to create an agency to grant KMS access rights to EVS. If you have the right to grant the permission, grant the KMS access rights to EVS directly. After the KMS access rights have been granted, follow-up operations do not require the rights to be granted again. If you do not have this permission, contact a user with the security administrator permissions to grant KMS access rights to EVS, then repeat the preceding operations. The encryption attribute of a disk cannot be changed after the disk has been created. For details, see EVS Encryption.	-
   	Tag	Optional During the EVS disk creation, you can tag the EVS resources. Tags identify cloud resources for purposes of easy categorization and quick search. A tag is composed of a key-value pair. Key: Mandatory if the disk is going to be tagged A tag key can contain a maximum of 36 characters, including letters, digits, and underscores (_). Value: Optional if the disk is going to be tagged A tag value can contain a maximum of 43 characters, including letters, digits, underscores (_), periods (.), and hyphens (-). NOTE: A maximum of 10 tags can be added for an EVS disk. Tag keys of the same EVS disk must be unique. Except for tagging the disk during disk creation, you can also add, modify, or delete tags for existing disks. For details, see Managing a Tag. For details about tags, see the Tag Management Service User Guide.	-
   Enterprise Project	-	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.	default
   Disk Name	-	Mandatory If you create disks individually, this parameter value is used as the actual disk name. The name can contain a maximum of 64 characters. If you create disks in a batch, this parameter value is used as the prefix of disk names, and one disk name will be composed of this parameter value and a four-digit number. The name can contain a maximum of 59 characters.	For example, if you create two disks and set volume for Disk Name, the EVS disk names will be volume-0001 and volume-0002.
   Quantity	-	Optional The number of disks to be created. The default value is set to 1, which means only one disk is created. Currently, you can create up to 100 disks at a time. NOTE: If the disk is created from a backup, batch creation is not possible, and this parameter must be set to 1. If the disk is created from a snapshot, batch creation is not possible, and this parameter must be set to 1.	1

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

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

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