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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.
In addition, you can run cat /proc/fs/ext4/vdb/options to obtain the complete mount parameters available to your EVS disk, or run man mount to view detailed parameter descriptions.
For more information, see Detaching an EVS Disk from a Running ECS. Parent topic: Detachment
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, 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.
For details about Expanding EVS Disk Capacity (Without LVM), see Table 2.
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
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
Introduction Video EVS Performance EVS performance metrics include: IOPS: The number of read/write operations performed by an EVS disk per second. Throughput: The amount of data read from and written into an EVS disk per second.
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.
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.
(Optional) Installing the SDI Driver With the SDI driver, EVS disks can be attached to BMSs. The EVS disks can be used as system disks from which the BMSs are booted. This facilitates quick BMS provisioning.
(Optional) Installing the SDI Driver With the SDI driver, EVS disks can be attached to BMSs. The EVS disks can be used as system disks from which the BMSs are booted. This facilitates quick BMS provisioning.
VBS Functions You can use VBS to back up and restore EVS disks.
VBS Functions You can use VBS to back up and restore EVS disks.
Currently, RDS calls the EVS APIs for encryption purposes. KMS is called when an EVS disk is created or mounted. Data writing and reading do not call KMS.
