Explanation
After a failure on a channel path, the unconditional
reserve processing procedure could not recover the specified device
through an alternate channel path.
The system could not recover
the device for one of the following reasons:
- No alternate channel paths were available for the device.
- All alternate channel paths were unsuccessful in recovery.
- The direct access storage device (DASD) hardware associated with dev does
not support the unconditional reserve command.
- The operator entered a reply of BOX to message IOS427A.
In the message text:
- dev
- The device number.
- chp
- The failing channel path identifier (CHPID). If the system could
not determine which channel path failed, asterisks appear in this
field.
System action
The system allows all requests that were previously
held to start. If the device was boxed, the system ends all previously
held requests in error.
Operator response
Do the following:
- Isolate the failing channel path for repair.
- If there is only one remaining channel path, transfer critical
applications to backup.
- Contact hardware support.
- Enter the IOACTION RESUME command for the device on all other
sharing systems if the device was stopped, or restart any stopped
systems, or vary the device back online.
Source
Input/output supervisor (IOS)
Module
Routing code
Descriptor code