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I would like to share with you how to keep a snapshot of disk data at a certain point in time. I believe most people don't know much about it, so share this article for your reference. I hope you will learn a lot after reading this article. Let's take a look at it!

Create a snapshot

Snapshots can retain the state of disk data at a certain point in time, and are often used for data backup and custom mirroring.

Working with scen

Creating snapshots is an extremely important operation, and in scenarios where there is operational risk, you can create snapshots in advance to back up data. Examples include modifying critical system files, migrating instances from classic networks to proprietary network VPC, daily data backup, preventing network attacks, changing operating systems, providing data support for some production environments, and other scenarios with operational risks.

Snapshots can also create custom images to quickly deploy application environments in a large number of ECS instances.

Matters needing attention

Description

Since March 28th, ECS snapshots have been commercialized and included in the billing service. For more information, please see Snapshot Billing. For more information about snapshot charges, see Snapshot Commercial FAQ.

Creating a snapshot may slightly degrade the performance of the disk, and the performance of Ipicuro slows down briefly. You need to avoid the peak of business.

The snapshot only backs up the data at a certain time, and during the creation of the snapshot, the incremental data generated by operating the disk is not synchronized to the snapshot.

To ensure that the snapshot is created successfully, you cannot modify the state of the ECS instance, such as stopping or restarting the ECS instance, when creating the snapshot.

When you create a snapshot based on an instance, the instance must be running or stopped.

When you create a snapshot from a disk, the disk must be in use.

The snapshots you created have been retained all the time. Please delete snapshots that are no longer needed on a regular basis to avoid continuous deduction of snapshot capacity.

If you use a single disk with multiple partitions to make an extended volume, the snapshot you create can roll back the disk normally.

After a dynamic extended volume is made using multiple disks, the snapshot created can roll back the disk normally when the data in the extended volume does not have an Icano operation. If there is always an Istroke O operation in the extended volume, the rolled back disk cannot guarantee the integrity of the data.

Operation steps

The steps to create a snapshot on the ECS Management console are as follows:

Log in to the ECS Management console.

Select the region.

On the left navigation bar, click the instance.

"locate the instance where you want to create a snapshot, and click manage."

Click the disk of this instance on the left, and then click create Snapshot on the right side of the corresponding disk. Only one disk can be selected at a time, and the disk properties can be system disk and data disk.

Enter a name for the snapshot and click OK.

Click the snapshot of this instance on the left to view the snapshot task. You can see the snapshot progress, estimated remaining time, and snapshot status.

You can also use ECS API CreateSnapshot to create snapshots.

Time required

The time it takes to create a snapshot depends largely on the disk capacity.

According to the incremental principle of snapshots, the first snapshot of a disk is a full snapshot, which takes a long time. Creating a snapshot again takes a relatively short time, but still depends on the amount of data change from the previous snapshot. The greater the change, the longer it takes.

Next step

After you create a snapshot, you can continue with the following:

Roll back the cloud disk

Create a cloud disk with snapshots

Create a custom mirror using a snapshot

The above is all the contents of the method of keeping the disk data state-snapshot at a certain point in time. Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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