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Figure 3 Data rebuild principle What Are the Differences Between Three-Copy Redundancy, EVS Snapshots, and EVS Backups? Three-copy redundancy improves the reliability of the data stored on EVS disks.
Different types of EVS disks can be attached to the same server. You only need to make sure that these disks and the server are in the same AZ. Parent topic: Attachment
If the disk was purchased on the EVS console and not as part of the same order as any server, it can be attached to another server. Parent topic: Attachment
Table 1 System-defined roles and policies supported by EVS Role/Policy Name Description Type Dependencies EVS FullAccess Full permissions for EVS. Users granted these permissions can create, attach, detach, query, and delete EVS resources, and expand capacity of EVS disks.
Table 1 API overview Type Subtype Description API EVS disk These APIs provide the functions, such as creating disks, deleting disks, and querying disk details. EVS snapshot An EVS snapshot is a complete copy or image of the disk data at a specific time point.
Yearly/Monthly data disks purchased on the EVS console have different expiration times as the server. They can be unsubscribed from separately. Snapshot creation / For details, see the constraints in Creating an EVS Snapshot.
For details, see Unsubscribing from or 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 Unsubscribing from or Deleting an EVS Disk. Parent topic: Billing
In the list, select Elastic Volume Service (EVS) for Service Type. In the Resource Tag column, find the _sys_recycle_bin_volume:true tag, which identifies the EVS recycle bin bill.
If this still fails to meet your needs, it is recommended that you create RAID arrays with EVS disks or manage EVS disks using LVM. Parent topic: Capacity
To check the supported regions, see the region information shown under "EVS Snapshots" in Function Overview. Calling Method For details, see Calling APIs.
Procedure Sign in to the EVS console. Choose Storage > Elastic Volume Service. The Elastic Volume Service page is displayed.
An EVS disk can be expanded either in the Available or In-use state. Expanding the disk capacity on the console enlarges the disk capacity, but you still need to log in to the server and extend the disk partitions and file systems to make that additional space usable.
For example, if an IAM user wants to query EVS disks using an API, the user must have been granted permissions that allow the evs:volumes:list action. Supported Actions EVS provides system-defined policies that can be directly used in IAM.
For more information, see Purchasing and Using an EVS Disk. Parent topic: General
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.
Handling Insufficient Disk Space on a Windows ECS Scenarios When the EVS disk space on a server is insufficient, the server running speed will be affected, which will further affect user experience.
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
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
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.
