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arcserve-KB : What is Retain Recovery Set in D2D

Last Update: 2016-11-23 17:04:59 UTC

Description:  Retain Recovery set is a new feature introduced with D2D 16 Update 7 which allows you to set the retention setting based on the number of recovery sets to retain instead of on the number of recovery points to retain. With this setting you can disable infinite incremental backups, without merging any sessions. Using recovery sets helps reduce the amount of time it takes to complete merge jobs.

The retention settings can be found at the below location on the D2D GUI console

Settings – Backup settings – Protection settings – Retention setting

Specify the number of recovery sets to retain

Specifies the number of recovery sets retained. A recovery set is a series of backups, starting with a full backup, and then followed by a number of incremental, verify, or full backups.

A full backup is required to start a new recovery set. The backup that starts the set will be automatically converted to a full backup, even if there is no full backup configured or scheduled to be performed at that time. A flag in the status column on the CA ARCserve D2D home page Most Recent Events section indicates that a full backup is the starting backup of a recovery set. After the recovery set setting is changed (for example, changing the recovery set starting point from the first backup of Monday to the first backup of Thursday), the starting point of existing recovery sets will not be changed.

Note: An incomplete recovery set is not counted when calculating an existing recovery set. A recovery set is considered complete only when the starting backup of the next recovery set is created.

When the specified limit is exceeded, the oldest recovery set is deleted (instead of merged).

Default: 2

Minimum: 1

Maximum: 100

Note: If you want to delete a recovery set to save backup storage space, reduce the number of retained sets and CA ARCserve D2D automatically deletes the oldest recovery set. Do not attempt to delete the recovery set manually.

Example 1 - Retain 1 Recovery Set:

-  Specify the number of recovery sets to retain as 1.

CA ARCserve D2D always keeps two sets in order to keep one complete set before starting the next recovery set.

Example 2 - Retain 2 Recovery Sets:

-  Specify the number of recovery sets to retain as 2.

CA ARCserve D2D will delete the first recovery set when the fourth recovery set is about to start. This ensures that when the first backup is deleted and the fourth is starting, you still have two recovery sets (recovery set 2 and recovery set 3) available on disk.

Note: Even if you choose to retain only one recovery set, you will need space for at least two full backups.

Example 3 - Retain 3 Recovery Sets:

-  The backup start time is 6:00 AM, August 20, 2012.

-  An incremental backup runs every 12 hours.

-  A new recovery set starts at the last backup on Friday.

-   You want to retain 3 recovery sets.

With the above configuration, an incremental backup will run at 6:00 AM and 6:00 PM every day. The first recovery set is created when the first backup (must be a full backup) is taken. Then the first full backup is marked as the starting backup of the recovery set. When the backup scheduled at 6:00 PM on Friday is run, it will be converted to a full backup and marked as the starting backup of the recovery set.

Start a new recovery set on every:

Selected day of the week

Specifies the day of the week selected to start a new recovery set.

Selected day of the month

Specifies the day of the month selected to start a new recovery set. Specify 1 through 30. Or, since a given month may have 28, 29, 30, or 31 days, you can specify the last day of the month as the day to create the recovery set.

Start a new recovery set with:

First backup on the selected day

Indicates you want to start a new recovery set with the first scheduled backup on the specified day.

Last backup on the selected day

Indicates you want to start a new recovery set with the last scheduled backup on the specified day. If the last backup is selected to start the set and for any reason the last backup did not run, then the next scheduled backup will start the set by converting it to a full backup. If the next backup is run ad-hoc (for example an emergency situation requires a quick incremental backup), you can decide if you want to run a full backup to start the recovery set or run an incremental backup so that the next backup starts the recovery set.

Note: The last backup may not be the last backup of the day if you run an ad-hoc backup.

The CA ARCserve D2D home page Summary section indicates how many recovery sets are retained (or in progress) out of the number specified. Click the link under Recovery Sets to display the Recovery Sets Details dialog. This dialog contains detailed information about the contents of the recovery set.

Also refer to Retain Recovery point feature on the below link

https://arcserve.zendesk.com/hc/en-us/articles/202770625

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