Each DCU contains four EMS modules and eight hard drives. Each hard drive is accessed through one EMS module (each EMS module has access to two different hard drives). Every LDom has access to at least one EMS module, and therefore has access to at least two hard disk drives, which are configured as a mirrored pair holding root, swap, dump and /u01 directories for user files and/or zone root file systems. Additional hard drives are left unconfigured and are available for storage.
The amount of storage that is available for an LDom will not change based on the number of CMUs that are installed in the DCU. However, the number of DCUs that are installed in a compute server does have an impact, because there are certain configuration PDomains that span across two DCUs (extended configuration PDomains), thereby providing additional storage for certain LDoms.