Channel subsystem rescan

Edit online

7.1 LPAR mode

From Linux® in LPAR mode, you can trigger a reevaluation of the I/O subchannels in the channel subsystem.

Trigger a rescan, for example, to recover from the following error situations.
  • Problems that arise from inconsistent subchannel status information in Linux.
  • Devices that become dissociated from their subchannel because of temporary device errors.
To trigger a channel subsystem rescan, issue the following command:
# echo > /sys/devices/css0/rescan

Depending on the number of CCW devices of the Linux instance, the rescan can take notable time to complete.