How to Modify Disk Allocation

  • Article

Applies To: System Center Data Protection Manager 2010

When you create a protection group, Data Protection Manager (DPM) recommends and allocates disk space for your protection group based on the size of the data to be protected. It is recommended that you do not change the default allocations until after you monitor disk usage for the protection group. If required, you can modify disk allocation according to the guidelines in the following table.

Protection component Disk allocation options Location

Replica volume

You can increase, but not decrease, the allocated disk space for the replicas.

DPM storage pool

Recovery point volume

You can increase or decrease, the allocated space for recovery points.

DPM storage pool

Change journal

You can increase, but not decrease, the allocated disk space for the change journal.

Protected volume on the file server or workstation

Custom volume

DPM does not manage custom volumes.

Any disk attached to the DPM server

Note

In the Create New Protection Group Wizard, DPM displays the Disk Allocation page only when a new protection group is created, when new members are added to an existing protection group, or when an existing protection group's properties are changed from short-term protection by using disk to tape.

To modify disk allocation

  1. In DPM Administrator Console, click Protection on the navigation bar.

  2. In the display pane, select the protection group for which you want to modify disk allocation.

  3. In the Actions pane, click Modify disk allocation.

  4. On the DPM Server tab, type the amount of space you want to allocate for Replica Volume and for Recovery Point Volume, and click OK.

    Note

    When creating a protection group, DPM helps to allocate optimal space. Click Calculate to have DPM allocate space based on a formula specific to a data source type. If you do not click Calculate, DPM allocates approximately two times the volume size for the replicas and recovery points.

    Click Shrink to calculate the thresholds to which the recovery point volume size can shrink.

  5. If you are modifying disk allocation on a protected computer, on the Protected Computer tab, type the amount of space you want to allocate in the Space Allocated column, and click OK.

  6. After reviewing the disk allocation changes, click OK.

    Note

    If data co-location is enabled on disk, click Collocated Protection to view co-located replica details for each co-located data source.

To modify disk allocation using DPM Management Shell

  • Use the following syntax to retrieve the current disk allocation:

    Get-DatasourceDiskAllocation [-Datasource] <Datasource> [-CalculateSize] [-Async] [-Tag <Object> ] [-Verbose] [-Debug] [-ErrorAction <ActionPreference> ] [-ErrorVariable <String> ] [-OutVariable <String> ] [-OutBuffer <Int32> ]

  • Use the following syntax to use the default disk allocation:

    Get-DatasourceDiskAllocation [-Datasource] <Datasource> [-Async <SwitchParameter>] [-CalculateShrinkThresholds <SwitchParameter>] [-CalculateSize <SwitchParameter>] [-PrimaryDpmServer <SwitchParameter>] [-Tag <Object>] [<CommonParameters>]

  • Use the following syntax to manually set the disk allocation:

    Set-DatasourceDiskAllocation [-Datasource] <Datasource> [-ProtectionGroup] <ProtectionGroup> -Manual [-ReplicaArea <Int64>] [-ShadowCopyArea <Int64>] [-ProductionServerJournalSize<Int64>] [-PassThru] [-Verbose] [-Debug] [-ErrorAction <ActionPreference>] [-ErrorVariable <String>] [-OutVariable <String>] [-OutBuffer <Int32>]

  • Use the following syntax to customize the disk allocation:

    Set-DatasourceDiskAllocation [-Datasource] <Datasource> [-ProtectionGroup] <ProtectionGroup> -CustomRequirements [-ReplicaVolume <DpmServerVolume>] [-ShadowCopyVolume <DpmServerVolume>] [-FormatVolumes <Nullable`1>] [-USNJournalSize <Int64>] [-PassThru] [-Verbose] [-Debug] [-ErrorAction <ActionPreference>] [-ErrorVariable <String>] [-OutVariable <String>] [-OutBuffer <Int32>]

    For more information, type "Get-Help Set-DatasourceDiskAllocation -detailed" in DPM Management Shell.

    For technical information, type "Get-Help Set-DatasourceDiskAllocation -full" in DPM Management Shell.

See Also

Tasks

How to Display Storage Pool Data
How to View Disk Allocation Information

Concepts

New Protection Group Wizard
How Disk Allocation Works
Understanding Data Protection
Understanding Data Recovery
What Is Synchronization?