View or modify storage pool settings
Updated: May 13, 2016
Applies To: System Center 2012 SP1 - Data Protection Manager, System Center Data Protection Manager 2010, System Center 2012 R2 Data Protection Manager
In the Management view of the DPM Administrator Console, you can review and modify storage pool settings.
In the Disks workspace of the DPM Administrator Console, the total capacity and disk space allocated for all disks in the storage pool is displayed, and you can review the following information for each disk in the storage pool:
Status: Healthy, unhealthy, or missing
Used space: Space allocated for protection
Unallocated space: Amount of unallocated space
Protected data sources on this disk: A list of the data sources protected on the disk
DPM automatically detects changes to the disk configuration in the storage pool but you can also manually rescan for changes by clicking Rescan in the Actions pane.
When you create a protection group, DPM recommends and allocates disk space for your protection group in the storage pool. This allocated is based on the retention range, work load type and the size of the data to be protected. Generally, the recommended allocations provide sufficient storage for at least a couple of weeks of recovery points.We recommend that you accept these disk allocations for the protection group unless you’re sure they don’t meet your requirements. If you change the settings, you might get fewer recovery points than you wanted or DPM might allocate more disk space than is needed. If you do want to change the settings note the following:
Use the Storage Calculators for DPM to help you figure out storage capacity requirements based on a set of input factors.
With data co-location enabled, DPM will allocate fixed size volumes in the storage pool. For more information, see Colocate data from different protection groups on disk.
If you’re protecting only a subset of the data on the protected volume, you can calculate the size of the protected data so that DPM can adjust its recommendations for disk allocation. To compute the disk allocation using the size of the data on the protected volume, in the ModifyDisk Allocation dialog box, click Calculate.
If the data on the protected volume outgrows the initial allocations, DPM can try to automatically grow the volume by 25% if the option Automatic grow the volumes in the Review Disk Allocation page of the Create New Protection Group wizard is selected. If the auto-grow operation fails, or if the option Automatic grow the volumes is not selected, DPM generates a “Recovery point volume threshold exceeded” or “Replica disk threshold exceeded” alert and provides guidance for increasing disk allocations appropriately.
To get more information about disk usage for a protection group, you can schedule and view a Disk utilization reports [DPM2012_Web].
Use the following table to help you understand disk allocation options.
Protection feature 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
If you still want to modify disk allocation settings do the following:
In DPM Administrator Console, go to the Protection view.
In the display pane, select the protection group for which you want to modify disk allocation.
Click Modify disk allocation.
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.
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.
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.
After reviewing the disk allocation changes, click OK. Note that:
If data co-location is enabled on disk, click Collocated Protection to view co-located replica details for each co-located data source.
The default disk space is 300 MB. You can increase, but not decrease, the space allocated for the change journal.