EMC Symmetrix Subsystem Control I/O through CKD dasd requires a
specific parameter list sent to the array via a Perform Subsystem
Function CCW. The Symmetrix response is retrieved from the array
via a Read Subsystem Data CCW.
Signed-off-by: NNigel Hislop <hislop_nigel@emc.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>