Enabling and disabling logging

Use the dasd= module parameter or use the erplog sysfs attribute to enable or disable error recovery processing (ERP) logging.

Procedure

You can enable and disable error recovery processing (ERP) logging on a running system. There are two methods:

Use the dasd= parameter when you load the base module of the DASD device driver.
Example:
To define a device range (0.0.7000-0.0.7005) and enable logging, change the parameter line to contain:
```
dasd=0.0.7000-0.0.7005(erplog)
```
Use the sysfs attribute erplog to disable ERP-related logging.
Logging can be enabled for a specific device by writing 1 to the erplog attribute
Example:
```
echo 1 > /sys/bus/ccw/devices/<device_bus_id>/erplog
```
To disable logging, write 0 to the erplog attribute, for example:
Example:
```
echo 0 > /sys/bus/ccw/devices/<device_bus_id>/erplog
```