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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.
Scenarios When the EVS disk space on a server is insufficient, the server running speed will be affected, which will further affect user experience.
Volume Backup Service (VBS) provides online backup for Elastic Volume Service (EVS) disks and allows data restoration from backups, offering protection against virus attacks and software and hardware faults.
Step 1: Purchase an EVS Disk Buy a data disk on the EVS console. Step 2: Attach the EVS Disk Attach the data disk to a Linux server. Step 3: Initialize the EVS Disk Initialize the data disk on the server. Preparations Sign up with Huawei Cloud.
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.
For more information, see Detaching an EVS Disk from a Running ECS. Parent topic: Detachment
Disk Type Selection EVS Performance EVS performance metrics include: IOPS: number of read/write operations performed by an EVS disk per second Throughput: amount of data read from and written into an EVS disk per second Read/write I/O latency: minimum interval between two consecutive
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.
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.
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.
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.
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.
For details about Expanding EVS Disk Capacity (Without LVM), see Table 2.
Cloud Server Backup Service (CSBS) creates consistent online backups for Elastic Volume Service (EVS) disks on Elastic Cloud Servers (ECSs), without stopping the servers.
The IOPS supported by RDS depends on the I/O performance of EVS disks. For details, see Disk Types and Performance in Elastic Volume Service Service Overview. Parent Topic: Performance Tuning
The IOPS supported by RDS depends on the I/O performance of EVS disks. For details, see Disk Types and Performance in Elastic Volume Service Service Overview. Parent topic: Common Performance Problems
If the ECS has multiple EVS disks, the backup will be restored to the original EVS disk. Alternatively, you can specify another EVS disk for the restoration. The specified EVS disk must have an equal capacity to or a larger capacity than the original EVS disk.
