Creating an EVS Disk¶
Scenarios¶
You can use EVS disks 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 cloud server console.
This section describes how to create data disks on the EVS console.
Notes and Constraints¶
Create On | Description |
|---|---|
The EVS console |
|
The cloud server console |
|
| Capacities of multiple disks cannot be combined, and the capacity of a single disk cannot be split. |
Procedure¶
Log in to the console.
Click
in the upper left corner and select the desired region and project.Click
in the upper left corner and choose Storage > Elastic Volume Service.The Elastic Volume Service page is displayed.
Click Create Disk.
Configure disk parameters according to Table 2.
Table 2 Disk parameters¶ 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.
eu-de
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.
eu-de-1
Disk Specifications
Mandatory
Common I/O
High I/O
Ultra-high I/O
General Purpose SSD
Extreme SSD
Note
If the type of the backup's source disk is Common I/O, High I/O, or Ultra-high I/O, you can create disks of any of these types.
For more information about disk types, see Disk Types and Performance.
Common I/O
Capacity (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 a 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.
20 GiB
Create from backup
Optional
Specifies to create the disk from a backup.
Click Select Data Source and choose Create from backup. On the displayed page, select the target backup and click OK.
Note
You can select a backup created by the current tenant or shared with the current tenant by another tenant.
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.
autobackup-001
Create from snapshot
Optional
Specifies to create the disk from a snapshot.
Click Select Data Source and choose Create from 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.
snapshot-001
Auto Backup
Optional
If auto backup is enabled, the system automatically creates backups for the disk at specified time points and deletes outdated backups according to the configured backup policy.
When Enable is selected, a backup policy must be configured. You can either use the default backup policy or customize the policy based on your service requirements.
Note
For details about the backup policy, see Managing EVS Disk Backups.
-Share
Optional
If Share is not selected, a common disk is created.
If Share is selected, a shared disk is created, and the shared disk can be attached to multiple servers.
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
Optional
If you do not select SCSI, a VBD disk is created. VBD is the default device type of EVS disks.
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.
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.
-Encryption
Optional
Disk encryption is used for data disk encryption only. System disk encryption relies on the image. For details, see the Image Management Service User Guide.
To use the disk encryption function, select Encryption. The displayed dialog box contains the following parameters:
Create Agency
An agency is a trust relationship between two tenants or services. A tenant can create an agency to grant resource access rights to another tenant or service. If the KMS access rights are not granted to EVS, the Create Agency dialog box will be displayed. Otherwise, it will not be displayed.
Click Yes to grant the KMS access rights to EVS. After the rights have been granted, EVS can obtain KMS keys to encrypt or decrypt EVS disks.
After the KMS access rights have been granted, follow-up operations do not require the rights to be granted again.
KMS Key Name
Note
KMS Key Name is displayed only after the KMS access rights have been granted. For details, see "Create Agency" above.
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 rights have been granted to EVS, the system automatically creates a Default Master Key evs/default.
CMKs: Existing or newly created CMKs. For details, see Management > Creating a CMK in the Key Management Service User Guide.
Note
Before you use the encryption function, KMS access rights need to be granted to EVS. If you have the right to grant the permission, grant the KMS access rights to EVS directly. 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 Managing Encrypted EVS Disks.
-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
Except for tagging the disk during disk creation, you can also add, modify, or delete tags for existing disks. For details, see Managing EVS Tags.
For details about tags, see the Tag Management Service User Guide.
-Disk Name
Mandatory
If you create a single disk, the name you entered will be used as the disk name.
The name 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. An actual disk name will be composed of the name you entered 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 preset disk quantity is 1, which means only one disk is created. You can create a maximum of 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
Click Create Now.
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.
In the disk list, view the disk status.
When the disk status changes to Available, the disk is successfully created.
