The copy threshold option is used to prevent the write response performance for a DRD-VOL with capacity saving enabled from being degraded due to overload by the copy processing of a replication program product that runs on the background.
You can enable the copy threshold option to suppress the background copy processing in the following replication program products:
- ShadowImage (SI)
- Thin Image Advanced (HTI Advanced)
- Volume Migration (VM)
- TrueCopy (TC)
- Universal Replicator (UR)
- Global-active device (GAD)
| Setting | Program product | Operation |
|---|---|---|
| OFF | SI, HTI Advanced, VM | As per the SOM 467 setting. |
| TC, GAD | As per the SOM 689 setting. | |
| UR | As per the SOM 690 setting. | |
| ON | SI, HTI Advanced, VM, TC, GAD, UR | The background copy processing stops when the cache write pending (WP) rate of the copy target MP unit is 35% or higher. |