DB2 zHyperLinks SCOPE field (ZHYPERLINK subsystem parameter)
The ZHYPERLINK subsystem parameter specifies the default scope of the zHyperLink protocol for I/O requests.
| Acceptable values: | DISABLE, ENABLE, DATABASE or ACTIVELOG |
|---|---|
| Default: | DISABLE |
| Online changeable: | Yes |
| Update: | option 2 on panel DSNTIPB |
| DSNZPxxx: | DSN6SPRM ZHYPERLINK |
The following values can be used to specify the default value for the ZHYPERLINK parameter:
- DISABLE
- Db2 does not use zHyperLink for any I/O requests.
- ENABLE
- All eligible I/O requests that Db2 makes request the zHyperLink protocol.
- DATABASE
- Db2 requests the zHyperLink protocol only for database synchronous read I/Os.
- ACTIVELOG
- Db2 requests the zHyperLink protocol only for active log write I/Os.
Note: 
In order for the zHyperLink protocol to be enabled for I/O requests
by the Db2 system, in addition to
specifying a value of ENABLE, DATABASE, or ACTIVELOG
for the ZHYPERLINK parameter, the SMS storage class of the Db2 data sets must be enabled for zHyperLink
eligibility using the Integrated Storage Management Facility (ISMF).
In order for the zHyperLink protocol to be enabled for I/O requests
by the Db2 system, in addition to
specifying a value of ENABLE, DATABASE, or ACTIVELOG
for the ZHYPERLINK parameter, the SMS storage class of the Db2 data sets must be enabled for zHyperLink
eligibility using the Integrated Storage Management Facility (ISMF).