How to use a snapshot to create a new cloud disk on the ECS console

The content of this article is about how to use a snapshot to create a new cloud disk on the ECS console. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. helped.

Create a cloud disk using a snapshot

You can use the snapshot of a cloud disk (whether it is a system disk or a data disk) to create a cloud disk individually through the console or API interface. The created cloud disk can be mounted to any ECS instance in the same region and the same availability zone. This article describes how to use a snapshot to create a new cloud disk on the ECS console.

Application Scenario

You may need to obtain some data in the snapshot, but do not want to roll back the cloud disk to achieve it . At this point, you can use the snapshot to create a new cloud disk and read data from the cloud disk. For example, if the system disk fails and the system cannot be started, you can use the existing snapshot of the system disk to create a new cloud disk and then mount it to a healthy instance to read the data in the system disk snapshot.

Performance Description

The newly created high-efficiency cloud disk and SSD cloud disk can achieve the highest performance corresponding to their capacity once they are successfully created. No preheating process is required. However, because snapshots are stored in object storage (OSS), when using snapshots to create cloud disks, ECS needs to retrieve data from OSS and write it to the cloud disk. This process takes a while and will cause performance degradation during the first access. It is recommended that you read all data blocks on the cloud disk before officially using this type of cloud disk to avoid initial performance degradation. For detailed information about OSS, see What is Object Storage OSS.

Notes

Before creating a cloud disk, you need to know the following information:

The cloud created in this way Disks can only be billed in a pay-as-you-go manner, and can only be used as data disks.

Note

You can also use a snapshot of the system disk or data disk to create a cloud disk when creating an ECS instance. Cloud disks created in this way are billed in the same way as instances.

You can create a new empty cloud disk. For specific operations, see Creating a Cloud Disk.

The limit of pay-as-you-go cloud disks created as data disks for each account in all regions = the number of pay-as-you-go instances for this account in all regions * 5. See Usage Restrictions for details.

Currently, cloud server ECS does not support merging multiple cloud disks. After a cloud disk is created, each cloud disk is an independent entity, and multiple cloud disk spaces cannot be merged together through formatting. It is recommended that you plan the number and capacity of cloud disks in advance.

It is not recommended to create logical volumes such as LVM (Logical Volume Manager) for multiple cloud disks that have been created. Because snapshots can only be created for each independent cloud disk, after using LVM, data differences will occur when rolling back the cloud disk using snapshots.

After creation, you can convert the billing method of the cloud disk:

If the cloud disk is mounted on a prepaid instance, upgrade the configuration of the prepaid instance to convert the pay-as-you-go cloud disk to Prepaid cloud storage.

If the cloud disk is mounted on a pay-as-you-go instance, convert the pay-as-you-go cloud disk to a prepaid cloud disk through Pay-As-You-Go to Prepaid.

For cloud disks created in this way, as long as the billing method is not converted, you can uninstall the cloud disk and release the cloud disk at any time.

Prerequisites

Before using a snapshot to create a cloud disk, you must confirm the following information:

You have configured the operating system Create a snapshot for the cloud disk or data disk and confirm the snapshot ID. For specific operations, see Creating a Snapshot.

Your account balance shall not be less than 100 yuan or equivalent vouchers or coupons. Because cloud disks created separately adopt a pay-as-you-go method.

The region and availability zone where the instance to which the cloud disk needs to be mounted is located. When mounting a cloud disk, the instance and the cloud disk must be in the same region and availability zone.

Operation steps

Log in to the ECS management console.

In the left navigation bar, click Storage > Cloud Disk.

In the upper right corner of the Disk List page, click Create Cloud Disk to enter the Create page.

Select a region and availability zone.

Note

When mounting a cloud disk, the instance and the cloud disk must be in the same region and availability zone.

Set the cloud disk configuration:

Select the cloud disk type: The optional cloud disk type is not affected by the source cloud disk type corresponding to the snapshot.

Click Create disk with snapshot and select a snapshot.

Description

If the selected snapshot is an encrypted disk snapshot, the encryption item will be automatically selected. Otherwise, you cannot check Encryption. For disk encryption, see ECS Disk Encryption.

Set the cloud disk capacity: the optional range is 20 GiB~32768 GiB. If the selected snapshot is less than 20 GiB, the system uses the minimum capacity of 20 GiB by default, and you can manually adjust the capacity according to your needs. If the selected snapshot is larger than 20 GiB, the system will automatically set the cloud disk size based on the snapshot size, but you must manually set the capacity after replacing the snapshot.

Set the purchase amount.

Confirm the current configuration and configuration fee.

Click Buy Now and follow the page guidance to complete creation.

After the creation is successful, return to the disk list page and refresh the list. You can see the newly created cloud disk and the disk status is displayed as To be mounted.

Follow-up operations

Mount cloud disk

Related API

Create cloud disk: CreateDisk

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