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Dell Unity provides the ability to take point-in-time snapshots for all storage resources (block or file) to meet protection and recovery requirements in the event of corruption or accidental deletion. The Snapshot Schedule page, as shown in Figure 24, enables users to set the system to periodically take snapshots of storage resources automatically. Automating these administrative tasks takes away some of the management aspects of data protection. After enabling a snapshot schedule for a resource, each snapshot taken is timestamped with the date and time when it was created, and it contains a point-in-time image of the data in the storage resource. The default snapshot schedules available on the system are:
Default protection: A snapshot is taken at 08:00 (UTC) every day, and the snapshot is retained for 2 days.
Protection with shorter retention: A snapshot is taken at 08:00 (UTC) every day, and the snapshot is retained for 1 day.
Protection with longer retention: A snapshot is taken at 08:00 (UTC) every day, and the snapshot is retained for 7 days.
Times are displayed in a user’s local time in a 12-hour format. Default snapshot schedules cannot be modified, but custom snapshot schedules can be configured by selecting the intervals, times, and days for the system to take snapshots regularly.
With the Dell Unity OE version 4.4 and later, user-defined Snapshot Schedules can be replicated using the Synchronous Replication connection established between two physical systems. Reference the new Sync Replicated column in the Snapshot Schedule page, as shown in Figure 24. Applying a replicated Snapshot Schedule is only allowed in synchronously replicated file resources.
In Dell OE version 5.1 and later, the Schedule Time Zone option can be set to correct snapshot schedule timing issues due to seasonal time changes in certain regions of the world. This feature automatically adjusts the timing of snapshot schedules as seasonal time changes occur to ensure that snapshots are created at the correct time. The Schedule Time Zone option applies to system-defined and user-created snapshot schedules. This option can be found in Settings > Management > Schedule Time Zone. A link to this page is also available within the Create Schedule page.
For more information about the snapshot technology available on Dell Unity systems and the Schedule Time Zone option, see the following white papers: