Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007 Installation Manual page 161

does not have any effect on SCSI devices. DMA modes can substantially increase the
performance and data transfer speed in your system.
During installation, the current SUSE Linux Enterprise kernel automatically activates
DMA for hard disks but not for CD drives, because default DMA activation for all
drives often causes problems with CD drives. Use the DMA module to activate DMA
for your drives. If the drive supports the DMA mode without any problems, the data
transfer rate of your drive can be increased by activating DMA.
NOTE
DMA (direct memory access) means that your data can be transferred directly
to the RAM, bypassing the processor control.
8.4.7 IBM System z: DASD Devices
To add a DASD to the installed system, there are two possibilities:
YaST
To add a DASD to an installed system, use the YaST DASD module (Hardware
> DASD). In the first screen, select the disks to make available to your Linux instal-
lation and click Perform Action. Select Activate then leave the dialog with Next.
Command Line
Issue the following command:
dasd_configure 0.0.0150 1 0
Replace 0.0.0150 with the actual channel number to which the DASD is attached.
The last zero of the command line should be 1 if the DASD should be accessed in
DIAG mode.
NOTE
In either case, you must run the commands
mkinitrd
zipl
System Configuration with YaST 143