Hi Gary, Dave Jones wrote: Note that in z/VM 5.4, a DCSS can live above the 31 bit bar, but it is still limited to the 2GB size.
The DCSS above 2G support that went into z/VM 5.4 not only allowed them above the 2G line, but also allowed them to be 'concatenated' to appear to the a SLES guest to be greater than 2G. For information about what SLES 11 and SLES 10 with patches can do, a customer needs to refer to Chapter 19. z/VM DCSS device driver in the Device Drivers, Features, and Commands - November, 2008 book page 215 and can be found at http://www.ibm.com/developerworks/linux/linux390/development_documentation.html There it states: Starting with z/VM 5.4, you can: v Locate a DCSS above 2047 MB v Set up DCSS devices with a size above 2047 MB by mapping multiple DCSSs to a single DCSS block device and on page 217, the syntax on the "dcssblk.segments=" statement shows : the colon (:) separates DCSSs within a set of DCSSs to be mapped to a single DCSS device. You can map a set of DCSSs to a single DCSS device if the DCSSs in the set form a contiguous memory space. So Dave is correct that z/VM 5.4 still limits the size of a DCSS to 2GB, but Linux can use a set of them so that multiple DCSSs look like one memory space that is greater than 2G. I know that this does not help you with Solaris. Doug Breneman z/VM Development IBM Endicott, NY
