Scheduling a snapshot virtual disk, Common reasons for scheduling a, Snapshot virtual disk – Dell PowerVault MD3220 User Manual

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Configuration: Premium Feature—Snapshot Virtual Disks

repository uses less disk space than a full physical copy, because the only data

blocks that are stored in the snapshot repository virtual disk are those that

have changed since the time of the snapshot.
When you create a snapshot virtual disk, specify its location, capacity,

schedule, and other parameters. You can disable or delete the snapshot virtual

disk when it is not required. If you disable a snapshot virtual disk, you can re-

create and reuse it the next time you perform a backup. For more

information, see "Re-creating Snapshot Virtual Disks" on page 157. If you

delete a snapshot virtual disk, you also delete the associated snapshot

repository virtual disk.

NOTE:

Deleting a snapshot does not affect data on the source virtual disk.

NOTE:

The following host preparation sections also apply when using the snapshot

feature through the CLI interface.

Scheduling a Snapshot Virtual Disk

When you create a snapshot virtual disk, you can choose whether the

snapshot is created immediately or is created according to a schedule that you

determine. This schedule can be a one-time snapshot creation or an ongoing

snapshot creation that occurs at regularly occurring intervals. If a schedule is

not specified, the snapshot virtual disk creation happens immediately upon

execution of the command.
A schedule can be specified when a snapshot virtual disk is first created, or it

can be added to an existing snapshot virtual disk at any time. One schedule

per snapshot virtual disk is supported.

Common Reasons for Scheduling a Snapshot Virtual Disk

Scheduling a snapshot virtual disk can serve multiple purposes across a data

storage environment. Most common uses of a snapshot scheduler are:

• Data backups
• Rapid recovery from a data loss event

A scheduled data backup can protect against data loss on a regular,

unmonitored basis. For example, if an application stores business-critical data

on two virtual disks in the storage array, you may choose to perform an

automatic backup every day. To implement this backup, select the first virtual

disk and create a backup schedule that runs once a day, Monday through

book.book Page 140 Tuesday, June 18, 2013 2:53 PM

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