The following diagram depicts the process. Ceph only supports cloning for format 2 images i. The kernel client supports cloned images since kernel 3. Ceph block device layering is a simple process. You must have an image. You must create a snapshot of the image. You must protect the snapshot. Once you have performed these steps, you can begin cloning the snapshot.
Snapshot (computer storage) - Wikipedia
The inclusion of the pool ID means that you may clone snapshots from one pool to images in another pool. Image Template: A common use case for block device layering is to create a master image and a snapshot that serves as a template for clones. For example, a user may create an image for a Linux distribution e.
Periodically, the user may update the image and create a new snapshot e.
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As the image matures, the user can clone any one of the snapshots. Extended Template: A more advanced use case includes extending a template image that provides more information than a base image. For example, a user may clone an image e.
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Template Pool: One way to use block device layering is to create a pool that contains master images that act as templates, and snapshots of those templates. You may then extend read-only privileges to users so that they may clone the snapshots without the ability to write or execute within the pool. Clones access the parent snapshots. All clones would break if a user inadvertently deleted the parent snapshot. To prevent data loss, you MUST protect the snapshot before you can clone it. To clone a snapshot, specify you need to specify the parent pool, image and snapshot; and, the child pool and image name.
You must protect the snapshot before you can clone it. You may clone a snapshot from one pool to an image in another pool. For example, you may maintain read-only images and snapshots as templates in one pool, and writeable clones in another pool.
Before you can delete a snapshot, you must unprotect it first. Additionally, you may NOT delete snapshots that have references from clones. You must flatten each clone of a snapshot, before you can delete the snapshot.
Cloned images retain a reference to the parent snapshot. The time it takes to flatten a clone increases with the size of the snapshot. To delete a snapshot, you must flatten the child images first. Since a flattened image contains all the information from the snapshot, a flattened image will take up more storage space than a layered clone.
Notice This document is for a development version of Ceph. Snapshot Manager supports smart snapshot space management that helps control the number of snapshots, and allows starting Snapshot Replica tasks after specified local snapshots are taken. Users can also initiate Snapshot Manager in File Station for creating snapshots, and identifying differing content using the snapshot overview with Unify Snapshot Directory.
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Modern businesses need modern solutions for backup and restoration With files and data being all-important for the long-term success of businesses, IT administrators need all-encompassing solutions for backing up and restoring both important files and the system itself. Benefits of Snapshots The Storage Manager features numerous tools for taking snapshots and restoring files and data as necessary. Why are Block-based LUN snapshots important to enterprises?
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Why is QNAP's snapshot support better? Easy management Snapshot Manager supports smart snapshot space management that helps control the number of snapshots, and allows starting Snapshot Replica tasks after specified local snapshots are taken. Real-time file replication File synchronization Fast transmission on local network Transmits large files with minor modifications Transmit to a remote site over the Internet.
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Index of /snapshots
With Snapshot Shared Folder. Real-time file replication File synchronization Fast transmission on local network. Transmits large files with minor modifications Transmit to a remote site over the Internet.
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