Support for DASD devices

modulename: dasd_mod.ko

configname: CONFIG_DASD

Linux Kernel Configuration
└─>Device Drivers
└─>Block devices
└─>Support for DASD devices
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable this option if you want to access DASDs directly utilizing
S/390s channel subsystem commands. This is necessary for running
natively on a single image or an LPAR.

source code:
drivers/s390/block/