Controlling the speed of a volume copy operation

When to control volume copy speed

You might want to control the speed of a volume copy operation at two times:

Before you start the volume copy operation
During a volume copy operation
Note
The speed for reading data from the source volume and the speed for writing data to the destination volume can be different. The smaller of the two values determines the time required for Data ONTAP to finish copying the data.

Why you change volume copy speed

You can change the speed of a volume copy operation when you suspect it might cause performance problems on your filer.

Note
Changing the vol.copy.throttle option changes the default speed for all volume copy operations to follow.

Controlling volume copy operation speed

To control volume copy operation speed, complete the following step.

Step	Action
1	If you want to control the speed of the volume copy...	Then...
Before you start the copy operations	Enter the following command: options vol.copy.throttle value value is the specific speed you want.
	During the copy operation	Enter the following command through a Remote Shell: vol copy throttle [operation_number] value operation_number is the specific volume copy operation whose speed you want to adjust. If you do not specify an operation number, the command applies to all volume copy operations that are in progress. value is the specific speed you want.

Step

Action

If you want to control the speed of the volume copy...

Then...

Before you start the copy operations

Enter the following command:

options vol.copy.throttle 
value

value is the specific speed you want.

During the copy operation

Enter the following command through a Remote Shell:

vol copy throttle 
[operation_number] value

operation_number is the specific volume copy operation whose speed you want to adjust. If you do not specify an operation number, the command applies to all volume copy operations that are in progress.

value is the specific speed you want.

Example

The following example illustrates changing the speed of all volume copy operations in progress to one-tenth of full speed through a Remote Shell:

rsh filerA vol copy throttle 1

volcopy operation 0: Throttle adjusted from 100% to 10%.

volcopy operation 1: Throttle adjusted from 100% to 10%.