Communicator e3000 MPE/iX Release 7.5 (Software Release C.75.00) (30216-90336)

Chapter 5
Technical Articles
Support for Using the Entire Disk Space on LDEV 1
112
Compatibility Issues
• STORE/RESTORE
If files stored from MPE/iX 7.5 are restored to a machine with a pre-7.5 OS, the following warning message
may appear. This is due to the $SYSTEM_MASTER interpretation (explained above) and can be ignored. The files
that show this warning are restored on LDEV 1.
COULD NOT BE RESTRICTED TO THE SYSTEM MASTER VOLUME
• SYSTEM REBOOT after MPE/iX 7.5 Installation/Update
During the first boot after install/update of this version, the following message may appear on the system
console (the system reports that it is mapping the entire LDEV 1 disk capacity for use):
"relocate ssm map to(in sectors) #####"
"To map to the full disk size ###### in pages"
Before Backdating Your System
Important Details Please Read
Before backdating from MPE/iX 7.5 version (or later) to an earlier version of MPE/iX (like 6.0, 6.5 or 7.0), it is
critical to understand that this LDEV 1 enhancement is not available in any of these pre-7.5 versions. Hence,
these pre-7.5 versions of the operating system cannot differentiate whether the files are within the first 4GB
of LDEV 1 or beyond it.
After backdating, pre-7.5 versions of the operating system will still be able to access the entire capacity of
LDEV 1 and start filling the disk from the beginning of the available free space. As a result, system utilities,
such as START and INSTALL, may be stored in the disk space beyond the first 4GB. If that occurs, the
system will not BOOT. A reinstall of the system from the pre-7.5 backup would then be required.
Once the system is able to boot after the backdating, the entire disk is available for the operating system and
entire disk files are available for use. However, this same risk exists every time a patch is applied to the
system.
RECOMMENDATION if considering backdating from 7.5 to an older release:
HP highly recommends that the user perform an INSTALL from the pre-7.5 backup instead of backdating.
Alternatively, the user could perform a full backup, INSTALL a pre-7.5 version, and then restore from the
backup.