Failed target ports are automatically recovered by the
zfcp device driver. You can read the in_recovery attribute
to check whether recovery is under way.
Before you begin
The FCP device must be online.
Procedure
Perform these steps to find out the recovery status of
a port and, if needed, start or restart recovery:
- Issue a command of this form:
# cat /sys/bus/ccw/drivers/zfcp/<device_bus_id>/<wwpn>/in_recovery
where:
- <device_bus_id>
- specifies the FCP device.
- <wwpn>
- is the WWPN of the target port.
The value is 1 if
recovery is under way and 0 otherwise. If the value
is 0 for a non-operational port, recovery might have
failed or the device driver might have failed to detect that the port
is malfunctioning.
- To find out whether recovery failed, read the failed attribute.
Issue a command of this form:
# cat /sys/bus/ccw/drivers/zfcp/<device_bus_id>/<wwpn>/failed
The value is 1 if recovery has failed
and 0 otherwise.
- You can start or restart the recovery process for the port
by writing
0 to the failed attribute.
Issue a command of this form: # echo 0 > /sys/bus/ccw/drivers/zfcp/<device_bus_id>/<wwpn>/failed
Example
In the following example, a port with WWPN
0x500507630300c562 that is attached through an FCP device with bus
ID 0.0.3d0c is malfunctioning. The first command reveals that recovery
is not already under way. The second command manually starts recovery
for the port:
# cat /sys/bus/ccw/drivers/zfcp/0.0.3d0c/0x500507630300c562/in_recovery
0
# echo 0 > /sys/bus/ccw/drivers/zfcp/0.0.3d0c/0x500507630300c562/failed