This topic describes the status of EVS.

The following table shows the status of EVS:

Status Category	EVS Disk Status	Operating Instruction	Description
Intermediate status - resources	Creating an EVS disk	Other operations are not supported in the intermediate state	The EVS is being created.
	Attaching		The created EVS disk is being attached to an EVS or a physical server.
	Detaching		The EVS disk attached to an ECS or a physical server is being detached.
	Deleting/Unsubscribing		The EVS disk in pay-as-you-go or yearly/monthly subscription mode is being unsubscribed.
	Scaling		The EVS disk capacity is being increased on the console.
	Modifying the disk type		The EVS disk type is being modified, for example, from Common I/O to High I/O.
	Rolling back a snapshot		The data is rolling back by using a snapshot.
	Creating a backup		The backup is being created for the EVS disk.
	Restoring data from backup		The EVS disk is restoring data from a backup.
	Destroying from the recycle bin		The EVS disk in the recycle bin is being manually destroyed.
Non-intermediate status - resources	Attached	Cannot be deleted	The EVS disk has already been attached to an ECS or a physical server.
	Unattached	Cannot be detached.	The EVS disk has not been attached to an ECS or a physical server.
Intermediate status - billing	The primary order has not been completed	Other operations are not supported	The EVS order is not complete and you are paying the order.
Non-intermediate status - billing	Real-name authentication not passed	Can only be deleted, unsubscribed, or scaled up	Some features are unavailable because your account does not pass the real-name authentication.
	Frozen (in arrears)	Can only be deleted, unsubscribed, or destroyed from the recycle bin	The EVS disk purchased in pay-as-you-go mode will enter the freezing period when your account is in arrears. In this case, the EVS disk is in the "Frozen" state.
	Expired	Can only be renewed. To unsubscribe from the service, submit a ticket	The subscription-based EVS disk enters the retention period after it expires. In this case, the EVS disk is in the "Expired" state.
Abnormal Status	“Error”	A snapshot or a backup cannot be created.	An error occurs in the EVS disk. You can submit a ticket for a solution.
	"Error_restoring"	A snapshot or a backup cannot be created	An error occurs when restoring the EVS disk from a backup. You can submit a ticket for a solution.

The following table shows the status of EVS snapshots:

Status Category	EVS Disk Status	Operating Instruction	Status Description
Intermediate status - resources	Creating	Other operations are not supported in the intermediate state	This snapshot is being created.
	Rolling back		The data is rolling back by using this snapshot.
	Creating an EVS disk		A new EVS disk is being created by using this snapshot.
	Deleting		This snapshot is being deleted.
Non-intermediate status - resources	Available	The snapshot can be used for data rollback and creating a new EVS disk, and it can also be deleted.	This snapshot is available.

Getting Started with EVS

EVS can be mounted to elastic cloud servers or dedicated physical servers as system disks and data disks to provide block storage services. System disks are created by default when you create cloud servers or dedicated physical servers. Data disks can be created when you select a cloud server or dedicated physical server or purchased separately. The following takes the separately purchased data disk as an example to introduce the process to get started with the EVS, as shown in the following figure:

Firstly, make preparations and register an eSurfing Cloud account. Make sure that your account balance is sufficient. For more information, see Preparations.
Set the configuration items in the EVS console, including capacity and type. For more information, see Creating EVS.
The created data disk must be mounted to a cloud server or dedicated physical server. For more information on how to mount a data disk, see Mounting EVS.
The mounted EVS cannot be used directly. It can be used only after being initialised on the cloud server or dedicated physical server. For more information, see Initialising Windows-based Data Disks and Initialising Linux-based Data Disks.

Elastic Volume Service

Status Description of EVS