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For more information, see Creating and Using an EVS Disk. Parent topic: General
When you create a BMS, you can select one from the following storage types: Elastic Volume Service (EVS): provides EVS disks of different QoS configurations to meet performance requirements in various scenarios.
Differences Between Expanding an EVS Disk and Creating an EVS Disk The differences are as follows: Expanding an EVS disk is when you expand the capacity of an existing EVS disk. Some systems let you expand the capacity of EVS disks in use.
The first snapshot is a full snapshot, which backs up all data (data blocks) on the EVS disk at the time of the snapshot. Subsequent snapshots are incremental snapshots, which back up only changed data blocks since the last snapshot. Parent topic: Snapshot
For details, see Deleting an EVS Disk. Yearly/monthly disk: A yearly/monthly disk cannot be deleted, but you can unsubscribe from it if needed. For details, see Deleting an EVS Disk. Parent topic: Billing
Yearly/Monthly data disks purchased on the EVS console have different expiration times as the server. They can be unsubscribed from separately. Parent topic: Billing
API Calling EVS supports Representational State Transfer (REST) APIs, allowing you to call APIs using HTTPS. For details about API calling, see Calling APIs. Parent Topic: Before You Start
For more information about shared disks, see Managing Shared EVS Disks. Shared disks are a type of EVS disks that can be attached to multiple servers. A shared file system or cluster management system must be set up before you can properly use a shared disk.
Scenarios When the EVS disk space on a server is insufficient, the server running speed will be affected, which will further affect user experience.
Symptom For a Linux ECS, the drive letter may change after an EVS disk is detached and then attached again, or after an EVS disk is detached and then the ECS is restarted.
Device Type of the EVS disk must be SCSI. A non-shared EVS disk must be in Available state. A shared EVS disk must be in In-use or Available state. BMSs using some flavors or images cannot have EVS disks attached because the servers do not have SDI iNICs or for other reasons.
Disk Backup Cloud Backup and Recovery (CBR) provides the cloud disk backup function, which allows you to back up EVS disks while servers are running.
Scenarios Shared EVS disks of the SCSI type support SCSI locks. To improve data security, the shared EVS disks of the SCSI type must be attached to the ECSs in the same anti-affinity ECS group.
For more information, see Detaching an EVS Disk from a Running ECS. Parent topic: Detachment
Use a backup to create an EVS disk and associate the EVS disk with a server. For details, see Attaching a Non-Shared Disk or Attaching a Shared Disk. Then copy data in the data disk to the system disk. Parent topic: Restoration
Use a backup to create an EVS disk , associate the EVS disk with a server, and export data to that server. Attach the new disks to the new server. For details, see Attaching a Non-Shared Disk or Attaching a Shared Disk. Parent topic: Others
Storage Migration If your cluster uses EVS disks, you need to migrate the EVS disks to the destination AZ together with the cluster. The migration method is as follows: Create a backup for the disk using the CBR service.
Back up the data stored in the local disks to the EVS disk that is newly attached to the disk-intensive ECS. For Windows ECSs, directly copy the data to be backed up to the EVS disk. For Linux ECSs, run the cp command to copy the data to be backed up to the EVS disk.
For details about Expanding EVS Disk Capacity (Without LVM), see Table 2.
For details, see Elastic Volume Service Product Introduction. VBS VBS backs up EVS disks and uses the backups to restore original EVS disks, ensuring user data accuracy and security.
