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Dell PowerFlex 4.5.x Administration Guide

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Create a snapshot

Creating a snapshot saves the state of the file system and all files and data within it at a particular point in time. You can use snapshots to restore the entire file system to a previous state.

About this task

Before creating a snapshot, consider:

  • Snapshots are not full copies of the original data. Do not rely on snapshots for mirrors, disaster recovery, or high-availability tools. Because snapshots are partially derived from the real-time data of the file systems, they can become inaccessible if the storage resource becomes inaccessible.
  • Although snapshots are space efficient, they consume overall system storage capacity. Ensure that the system has enough capacity to accommodate snapshots.
  • When configuring snapshots, review the snapshot retention policy that is associated with the storage resource. You may want to change the retention policy in the associated rules or manually set a different retention policy, depending on the purpose of the snapshot.
  • Manual snapshots that are created with PowerFlex Manager are retained for one week after creation (unless configured otherwise).
  • If the maximum number of snapshots is reached, no more can be created. In this case, to enable creation of new snapshots, you are required to delete existing snapshots.

Steps

  1. Click File > File Systems.
  2. Select the check box of the relevant file system to select it and click Protection > Create Snapshot.
  3. In the Create Snapshot of File System panel, enter a unique name for the snapshot, and set the Local Retention Policy.
    NOTE:Retention period is set to one week by default. You can set a different retention period or select the No Automatic Deletion for indefinite retention.
  4. Click the File Snapshot Access Type.
    For file systems, you can create three access types. The default access type is Protocol (Read-Only) protocol.
    • Protocol (read-only): Creates read-only snapshot that can be mounted and accessed later through NFS export or SMB share.
    • Snapshot: Creates read-only auto mounted snapshot accessible through the snapshot directory in the file system.
    • Protocol (read-write): Creates a read write snapshot that can be mounted and accessed later through NFS export or SMB share.
  5. Click Create Snapshot.

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