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# Set copy pace (QoS) for device groups

The QoS (Quality of Service) feature adjusts the data transfer (copy) pace on individual volumes or groups of volumes (DGs or SGs) for certain operations.

## Steps

1. Select the storage system.
2. Select Data Protection > Device Groups.
3. Select the device group, click , and select Replication QoS.
4. Select Operation Type from the following valid values:
   - SRDF—Sets the copy pace priority during SRDF operations.
   - Mirror Copy —Sets the copy pace priority during mirror operations.
   - Clone—Sets the copy pace priority during clone operations.
   - VLUN—Sets the copy pace priority during virtual LUN migrations.
5. Select the Copy Pace from the following valid value:
   - 0 -16—Sets the copy pace, with 0 (the default) as the fastest and 16 as the slowest.
   - STOP—Stops the copy. Not supported when the Operation Type is BCV.
   - URGENT—Sets the copy pace to urgent, which may be faster than the default (0). Not supported when the Operation Type is BCV.
6. If performing this operation on a group, select the type of volumes on which to perform the operation.
7. Click OK.

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