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Dell PowerVault MD 32XX/36XX Series Storage Arrays CLI Guide

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Using The Snapshot (Legacy) Feature

The following types of virtual disk snapshot premium features are supported on the MD storage array:
  • Snapshot Virtual Disks using multiple point-in-time (PiT) groups
  • Snapshot Virtual Disks (Legacy) using a separate repository for each snapshot
  • NOTE: This section describes the Snapshot Virtual Disk (legacy) premium feature. If you are using the Snapshot Virtual Disk using PiT groups, see the Using The Snapshot Feature section.

This chapter describes how the Snapshot (legacy) feature works, lists the snapshot script commands, and explains how to use the commands to create snapshot virtual disks. Additional information about the Snapshot (legacy) feature and related definitions is available in the Deployment Guide and the Owner’s Manual.

The Snapshot (legacy) feature creates a snapshot virtual disk that you can use as a backup of your data. A snapshot virtual disk is a logical point-in-time image of a standard virtual disk. Because it is not a physical copy, a snapshot virtual disk is created more quickly than a physical copy and requires less physical disk space. Typically, you create a snapshot virtual disk so that an application, such as a backup application, can access the snapshot virtual disk. The application reads the data while the source virtual disk remains online and user accessible. You can also create several snapshot virtual disks of a source virtual disk and write data to the snapshot virtual disks to perform testing and analysis.

  • NOTE: If you ordered Premium Features for the Snapshot Virtual Disks, you would have received a Premium Features Activation card shipped in the same box as your Dell PowerVault MD storage array. Follow the directions on the card to obtain a key file and to enable the feature. For more information, see Premium Feature — Snapshot Virtual Disks in the Owner’s Manual.

Snapshot virtual disks allow you to perform the following tasks:

  • Create a complete image of the data on a source virtual disk at a particular point in time.
  • Use only a small amount of disk space.
  • Provide quick, frequent, nondisruptive backups; or test new versions of a database system without affecting actual data.
  • Provide for snapshot virtual disks to be read, written, and copied.
  • Use the same availability characteristics of the source virtual disk (such as redundant array of independent disks (RAID) protection and redundant path failover).
  • Map the snapshot virtual disk and make it accessible to any host on a storage area network. You can make snapshot data available to secondary hosts for read and write access by mapping the snapshot to the hosts.
  • Create up to four snapshots per virtual disk.
    • NOTE: The maximum number of snapshot virtual disks is one-half of the total number of virtual disks supported by the RAID controller module.
  • Increase the capacity of a snapshot virtual disk.
The following table lists the components that comprise a snapshot virtual disk and briefly describes what they do.
Table 1. Snapshot Virtual Disk Components
Component Description
Source virtual disk Standard virtual disk from which the snapshot is created
Snapshot virtual disk Point-in-time image of a standard virtual disk
Snapshot repository virtual disk Virtual disk that contains snapshot metadata and copy-on-write data for a particular snapshot virtual disk
The following table lists the snapshot virtual disk commands and brief descriptions of what the commands do.
Table 2. Snapshot Virtual Disk Commands
Command Description
create snapshotVirtualDisk Creates a snapshot virtual disk.
re-create snapshot Starts a fresh copy-on-write operation by using an existing snapshot virtual disk.
set (snapshotVirtualDisk) Defines the properties for a snapshot virtual disk and enables you to rename a snapshot virtual disk.
stop snapshot Stops a copy-on-write operation.

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