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Snapshot FAQs

Last updated:2021-09-30 17:34:51

Will the snapshot be retained when I delete an EBS volume?

Yes. To delete a snapshot, go to the EBS console or call the DeleteSnapshot operation. For more information, see Delete snapshots.

How do I delete a snapshot?

To delete the snapshot of an EBS volume, go to the EBS console or call the DeleteSnapshot operation. For more information, see Delete snapshots.

How long does it take to create a snapshot?

The time for creating a snapshot depends on various factors such as the amount of data written to an EBS volume and reads and writes of the storage clusters. Therefore, it is difficult to predict the time. However, creating a snapshot does not affect your use of an EBS volume.

Do I need to shut down the KEC instance before I use a snapshot to roll back an EBS volume?

If you have attached the EBS volume to a KEC instance, you must shut down the KEC instance before the rollback. If the EBS volume is not attached to an instance, you can directly roll back the volume.

How do I calculate the size of the first full snapshot for an EBS volume?

The first snapshot for an EBS volume is a full snapshot, which is a backup of all data stored in the EBS volume when this snapshot is created. The snapshot size is the used capacity of the EBS volume. For more information, see How snapshots work and View the snapshot size.

Why is the snapshot size of an EBS volume different from the used capacity of the EBS volume displayed in the file system?

A snapshot of an EBS volume is a backup of all underlying data blocks. Typically, the snapshot size is greater than the data volume displayed in the file system. The difference is caused by the following factors:

  • The metadata of the file system is stored in the underlying data blocks, increasing the size of data backed up in the snapshot.
  • A large number of data blocks are written into the EBS volume when the file system is initialized. The written data occupies the EBS volume and is backed up in the snapshot.
  • The deletion of data reduces the data size in the file system. However, data deletion modifies the existing data blocks, which are still backed up in the snapshot.
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