The following dependencies affect the performance of pairs that are in the process of Quick Split (PSUS(SP)/PSUS status) or Steady Split (COPY(SP)/COPY status):
- Whether system option mode (SOM) 459 is ON.
- Whether the S-VOL is an external or internal volume.
- If the S-VOL is a DP-VOL.
The following table lists the affects of these conditions.
|
SOM 459 |
S-VOL* |
PSUS(SP)/PSUS or COPY(SP)/COPY status |
|---|---|---|
|
OFF |
Internal volume |
Differential data is copied to the cache in the storage system. The pair is in the process of Quick Split (PSUS(SP)/PSUS status). |
|
External volume |
||
|
ON |
Internal volume |
|
|
External volume |
Differential data is copied to the cache in the storage system, and destaging to the external storage system has completed. The pair is split (PSUS status). |
|
|
* If the S-VOL is a DP-VOL, this column indicates whether the top pool volume allocated to the S-VOL is internal or external. |
||