HP/UX Page Deallocation Table

When bit errors occur in the memory of HP/UX systems the error is logged in the PDT (Page Deallocation Table). To see the PDT boot the system to the BCH (Boot Console Handler), go into the SERvice menu and then PDT. The HP guy said that finding a couple of dozen on older machines is normal and doesn't matter although the table is much smaller on them. The RPs have 3000 slots and the systems of the vintage of D's only have 128.

Service Menu: Enter command > help PDT
---- PDT Help ----------------------------------------------------------------
PDT will display the contents of the Page Deallocation Table.
PDT CLEAR will clear the Page Deallocation Table and then hard
boot the system. The PDT CLEAR command will cause memory to be
reconfigured when the system is rebooted.
PDT Display PDT contents
PDT CLEAR Clear the PDT
NOTE: When the CLEAR command is executed the user is first
queried before proceeding to clear the PDT.

This information is also available from STM (xstm and cstm) (thanks Dave!)