Recovery actions for a channel path error with shared DASD or assignable devices

  1. Identify which devices on channel path 01 on system 1 are shared with system 2.
  2. Enter the IOACTION STOP command on system 2 to stop I/O on the shared devices. The device numbers may not be the same on both systems.
  3. Restart system 1.
  4. Wait for the system to issue message IOS204E (or IOS201E), indicating that channel path recovery is complete.
  5. Enter the IOACTION RESUME command on system 2 to allow I/O to resume to the shared devices.

Note:
  1. Do not leave devices in the stopped state any longer than necessary to perform recovery. A shortage of SQA storage can result from stopping I/O for extended periods.
  2. Before stopping a device, enter the D U,DASD,ALLOC,xxx command to determine which system resource's I/O will be affected. If any system oriented I/O will be stopped, the system could appear frozen. This situation will last until I/O resumes to the device.
Parent topic: Channel path recovery