PARAMS

These are the operations that enable you to view and change configuration parameters of the DSC. For a list of parameters that you can change, see Configuration parameters.

SET

The SET command changes the configuration value that is specified by name to value.

Syntax

    DSC PARAMS SET name value [/service: headnode]

Remarks

The /service option specifies the name of the cluster’s head node. Use the /service option if the environment variable %CCP_SCHEDULER% is not set. This environment variable identifies the location of the head node and is read by the Dsc.exe program. Although the environment variable is set by default on the head node itself, it is not set by default on the client.

Examples

DSC PARAMS SET DiskCleanupInterval 7200

This command sets the disk clean up interval to happen every two hours.

LIST

The LIST command lists the names and values of all the configuration settings of the DSC.

Syntax

DSC PARAMS LIST [/service: headnode]

Remarks

The /service option specifies the name of the cluster’s head node. Use the /service option if the environment variable %CCP_SCHEDULER% is not set. This environment variable identifies the location of the head node and is read by the Dsc.exe program. Although the environment variable is set by default on the head node itself, it is not set by default on the client.

Examples

DSC PARAMS LIST  

This command lists the DSC configuration parameters.

Configuration parameters

The following table lists each configuration parameter, its unit, and its default value.

 

Parameter name

Unit

Default value

Description

DiskCleanupInterval

Seconds

3600

This parameter specifies how often the DSC cleans up the working directories of completed jobs. The cleanup task deletes the binaries, any intermediate data that were used to process LINQ to HPC queries, and any files associated with file sets that have been removed from the DSC.

PeriodicMaintenanceEnabled

TRUE or FALSE

TRUE

This parameter is a global flag that enables or disables all DSC background tasks. These tasks include replication and disk clean up.

ReplicationFactor

Number of files

3

The replication factor controls how many copies (that is, replicas) of each DSC file in each new DSC file set will be created. The value must be 1, 2, 3, or 4. A value of 1 means that no redundant copies will be kept. Disabling replication is not recommended. Without replication, you can lose data if a DSC node fails. Also, the graph manager has fewer options when it decides where to execute vertices, which may result in decreased performance for LINQ to HPC queries. The replication factor is applied to DSC file sets when they are created. If you change the replication factor, no changes are made to existing DSC file sets. They keep the replication factor that was used when they were created.

ReplicationInterval

Seconds

60

This parameter specifies how often the DSC runs the replication task. The task copies files across the compute nodes and synchronizes the DSC's catalog file with the actual locations of the files on the compute nodes.



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