The Start-DedupJob starts a new data deduplication job for one or more volumes. The data
deduplication job can queue if the server is running another job on the same volume or if the
computer does not have sufficient resources to run the job. The server marks the queued jobs that
you start with this cmdlet as manual jobs and gives the manual jobs priority over scheduled jobs.
The server returns a DeduplicationJob object for each job that you start with this cmdlet.
For multi-volume data deduplication jobs, you can use the Preempt parameter to move a job to the
top of the job queue and cancel the current job.
This command starts a deduplication optimization job on drive D: and consume up to a maximum of
50 percent of RAM.
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.
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.
Indicates that garbage collection jobs free up all deleted or unreferenced data on the volume, if
you specify the value GarbageCollection for the Type parameter. If you do not specify this
parameter, garbage collection jobs free up space after a system threshold of delete data is
exceeded. We recommend that you run garbage collection regularly without specifying this parameter,
and then once a month specify this parameter and run garbage collection again.
If you specify the value Scrubbing for the Type parameter, this parameter indicates that
scrubbing jobs validate the integrity of all data on the volume. If you do not specify this
parameter, the scrubbing job validates only critical metadata and data integrity issues that data
deduplication previously encountered. We recommend that you run scrubbing regularly without
specifying this parameter, and then once a month specify this parameter and run scrubbing again.
Specifies the amount of input/output throttling applied to the deduplication job. Throttling ensures
that deduplication does not interfere with other I/O intensive processes. The acceptable values for
this parameter are: integers from 0 to 100. If you specify this parameter and the
InputOutputThrottleLevel parameter, InputOutputThrottle takes precedence.
Specifies the amount of I/O throttling that the job provides to ensure that the job does not
interfere with other I/O intensive processes. The acceptable values for this parameter are:
None
Low
Medium
High
If you specify this parameter and the InputOutputThrottle parameter, InputOutputThrottle
takes precedence.
Parameter properties
Type:
InputOutputThrottleLevel
Default value:
None
Accepted values:
None, Low, Medium, High, Maximum
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-Memory
Specifies the maximum percentage of physical computer memory that the data deduplication job can
use.
For optimization jobs, we recommend that you set a range from 15 to 50, and a higher memory
consumption for jobs that you schedule to run when you specify the StopWhenSystemBusy parameter.
For garbage collection and scrubbing jobs, which you typically schedule to run in off hours, you can
set a higher memory consumption, such as 50.
Indicates that the deduplication engine moves the job to the top of the job queue and cancels the
current job. After the server cancels the current job, the deduplication engine cannot run the
preempting job if the server does not have enough memory to run the job.
This parameter applies to manual data deduplication jobs only and is ignored for scheduled jobs. You
can preempt only deduplication jobs on multiple volumes.
Sets the CPU and I/O priority for the optimization job run that you run by using this cmdlet. For
jobs that you run when you specify the StopWhenSystemBusy parameter, we recommend that you set
this parameter to Low. For typical optimization jobs, we recommend that you set this parameter to
Normal.
Parameter properties
Type:
Priority
Default value:
None
Accepted values:
Low, Normal, High
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-ReadOnly
Indicates that the scrubbing job process and report on corruptions that it finds but does not run
any repair actions.
Indicates that the server stops the job when the system is busy and retries later. We recommend that
you specify this parameter when you set a low priority for the job.
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.
Specifies a date and time. This parameter applies only to unoptimization jobs. The deduplication
engine unoptimizes only files that it optimized or reoptimized since the System.DateTime value
that you specify.
Specifies an array of system volumes for which you want to manually queue data deduplication jobs.
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.
Parameter properties
Type:
String[]
Default value:
None
Supports wildcards:
False
DontShow:
False
Aliases:
Path, Name, DeviceId
Parameter sets
(All)
Position:
1
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-Wait
Indicates that the cmdlet waits for the job to complete and provides progress information to the
client.
This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable,
-InformationAction, -InformationVariable, -OutBuffer, -OutVariable, -PipelineVariable,
-ProgressAction, -Verbose, -WarningAction, and -WarningVariable. For more information, see
about_CommonParameters.
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.