Update-Dedup Status

Module:
deduplication
Scans volumes for fresh data deduplication savings.

Syntax 

Update-DedupStatus
      [[-Volume] <String[]>]
      [-CimSession <CimSession[]>]
      [-ThrottleLimit <Int32>]
      [-AsJob]
      [<CommonParameters>]

Description

The Update-DedupStatus cmdlet scans one or more specified volumes to compute fresh data deduplication savings information. This cmdlet returns a DeduplicationStatus object. For quick access to cached metadata use Get-DedupStatus . When this cmdlet is run on multiple volumes with one cmdlet call, the analysis for each volume is done serially.

Note: On large volumes this cmdlet can run for several minutes and will always perform a rescan after the initial scan. The default behavior is to wait for completion, regardless of the length of time required to run the scan and rescan.

To run this cmdlet, you must start Windows PowerShell® with the Run as administrator option.

This cmdlet returns the following metadata:

  • DedupSavedSpace. Saved space is the difference between the logical size of the optimized files and the logical size of the store. This is the deduplicated user data plus data deduplication metadata. This number changes continually.
  • DedupRate. Data deduplication rate is the ratio of data deduplication saved space to the logical size of all of the files on the volume and is expressed in percentage. This number will change continually.
  • OptimizedFilesCount. Optimized files count is the number of optimized files on the specified volume. This number remains steady, instead of decreasing, as users delete files from, or add files to, the volume, until a garbage collection job is run. This count is most accurate after a garbage collection job runs.
  • OptimizedFilesSize. Optimized files size is the aggregate size of all optimized files on the specified volume. This number remains steady, instead of decreasing, as users delete files from, or add new files to, the volume, until a garbage collection job is run. This number is most accurate after a garbage collection job runs.
  • InPolicyFilesCount. In policy files count is the number of files that currently qualify for optimization. This number stays relatively constant between optimization jobs.
  • InPolicyFilesSize. In policy files size is the aggregate size of all files that currently qualify for optimization. This number stays relatively constant between optimization jobs.
  • LastOptimizationTime. Last optimization time specifies the data and time when an optimization job was run last on the specified volume. This date and time stays constant between optimization jobs.
  • LastGarbageCollectionTime. Last garbage collection time specifies the data and time when a garbage collection job was run last on the specified volume. This date and time stays constant between optimization jobs.
  • LastScrubbingTime. Last scrubbing time specifies the data and time when a scrubbing job was run last on the specified volume. This date and time stays constant between optimization jobs.

Examples

Example 1: Scan a volume for savings information 

PS C:\> Update-DedupStatus -Volume "D:"

This command scans the D: volume to compute data deduplication savings.

Optional Parameters

-AsJob

Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.

The cmdlet immediately returns an object that represents the job and then displays the command prompt. You can continue to work in the session while the job completes. To manage the job, use the *-Job cmdlets. To get the job results, use the Receive-Job cmdlet.

For more information about Windows PowerShell background jobs, see about_Jobs .

Type: SwitchParameter
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False
-CimSession

Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.

Type: CimSession[]
Aliases: Session
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False
-ThrottleLimit

Specifies the maximum number of concurrent operations that can be established to run the cmdlet. If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer. The throttle limit applies only to the current cmdlet, not to the session or to the computer.

Type: Int32
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False
-Volume

Specifies one or more file system volumes for which to scan and compute fresh data deduplication savings information. Enter one or more volume IDs, drive letters, or volume GUID paths. For drive letters, use the format D:. For volume GUID paths, use the format \\?\Volume{{GUID}}. Separate multiple volumes with a comma.

Type: String[]
Aliases: Path, Name, DeviceId
Position: 0
Default value: None
Accept pipeline input: True (ByPropertyName)
Accept wildcard characters: False

Inputs

System.String[]

Outputs

Microsoft.Management.Infrastructure.CimInstance

The Microsoft.Management.Infrastructure.CimInstance object is a wrapper class that displays Windows Management Instrumentation (WMI) objects. The path after the pound sign ( # ) provides the namespace and class name for the underlying WMI object.