Chapter 5. Managing Multipath I/O for Devices / 5.15. Resolving Stalled I/O
	5.14. Managing I/O in Error Situations		5.16. Additional Information

Resolving Stalled I/O

If all paths fail concurrently and I/O is queued and stalled, do the following:

Enter the following command at a terminal console prompt:
```
dmsetup message mapname 0 fail_if_no_path
```
Replace mapname with the correct device ID or mapped alias name for the device. This causes all queued I/O to fail and propagates the error to the calling application.
Reactivate queueing by entering the following command at a terminal console prompt:
```
dmsetup message mapname 0 queue_if_no_path
```