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Terme informatique

Snapshot

A point in time that retains the status or changes of a system without necessarily constituting an independent backup.

Virtualization
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Simple definition

A point in time that retains the status or changes of a system without necessarily constituting an independent backup.

Technical definition

One snapshot VM usually creates delta files depending on the parent disk; on storage, the mechanism can use copy-on-pyly or PORTANT-on-pyly.

What is it used for ?

Create a temporary point before a risky modification and facilitate a quick backwards.

Practical example

Before an application update, an administrator can create a snapshot The Commission has not yet taken any action to ensure that the Commission’s proposal is implemented in accordance with Article 3 of the Treaty.

Common issues

  • Snapshot kept too long
  • Datastore saturated
  • Complex or damaged disk chain

Virtual machine · Datastore · Backup

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

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