Enabling PPRCSUM

Provisioning Guide for Mainframe Systems for VSP One Block 85

Version

10.5.x

Audience

anonymous

Part Number

MK-26VSP1B034-02

ft:lastEdition

2026-05-04

If you perform a volatile startup on the storage system (forced volatile power shutdown on DKC and DKU, power off and then volatile power on, or offline microcode replacement), the settings on the storage system is disabled. For this reason, make sure to set the volatile startup again.

For details on the feature and execution methods of the z/OS commands, and the features, and setting methods of the options, see the IBM^® publications.

Use the following procedures to enable or disable PPRCSUM using CCI. For more information about how to change the settings using VSP One Block Administrator, see the VSP One Block Administrator Guide.

Clear the error information for configuration setting commands run asynchronously in CCI.
```
# raidcom reset command_status
```
Enable PPRCSUM for the system.
Example: Enable function ID 9 for mainframe system feature.
```
# raidcom modify mainframe_system_function -set_function_id 9
```
Verify the error information for configuration setting commands run asynchronously in CCI.
Make sure that the value of ERR_CNT is 0.
```
# raidcom get command_status
```
Obtain the information about the configured mainframe system function and verify that the specified settings have been applied.
```
# raidcom get mainframe_system_function
```
Run the following MVS system operator command on z/OS to enable the PPRCSUM feature:
```
F DEVMAN,ENABLE(PPRCSUM)
```
Run the following MVS system command, and then verify that Byte27,Bit5 (Byte24-31,Bit29) in READ FEATURE CODES is ON:
```
DS QD,[DEV#],RDFEATS
```
Tip: For DEV#, use the DEV# on which VaryOn is being performed in the CU.

Command output example:

Verify the bold part (X4) in the following command output example, and then verify that the X4 Bit is ON.
```
DS QD,xxxx,RDFEATS
UNIT VOLSER SCUTYPE DEVTYPE CYL SSID SCU-SERIAL DEV-SERIAL EFC
0xxxx xxxxxx xxxxxxx xxxxxxx xxxx xxxx xxxx-xxxxx xxxx-xxxxx xxx
READ FEATURE CODES
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxX4xxxxxxxx
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
```
If IEA075I is not displayed even after enabling the PPRCSUM feature, perform steps 5 and 6 again.

If Byte27,Bit5 (Byte24-31,Bit29) in READ FEATURE CODES is ON, IEA075I is output. If Byte27,Bit5 (Byte24-31,Bit29) in READ FEATURE CODES is not ON even after retrying, the host might not recognize that PPRCSUM is enabled. In that case, perform VaryOff on all DEVs in the CU, and then perform VaryOn.

Alternatively, specify ENABLE(PPRCSUM) for the OS parameter SYS1.PARMLIB(DEVSUPxx)on the z/OS system to perform IPL.