HP Dynamic Root Disk (DRD) manual

DRD-Safe Concepts for HP-UX 11i v2 and Later

1	Introduction......................................................................................................................................		2
	1.1	Abstract ....................................................................................................................................	2
	1.2	Purpose of Document..................................................................................................................	3
	1.3	Audience ..................................................................................................................................	3
	1.4	Release Information ....................................................................................................................	3
	1.5	Terms and Definitions .................................................................................................................	3
2	What must be DRD-Safe?...................................................................................................................		6
3	DRD-Safe Problem Areas ...................................................................................................................		7
	3.1	Process Communications.............................................................................................................	7
	3.2	Unterminated Process .................................................................................................................	9
	3.4	Firmware Patches and Other Unsafe Packages ............................................................................	10
4	Making Control Scripts and Commands DRD-Safe ..............................................................................		11
	4.1	Control Scripts Stopping, Starting or Restarting Processes/Daemons ..............................................	11
	4.2	Commands that Communicate with Other Processes.....................................................................	12
	4.4	Unsafe Logic in an Unconfigure Script ........................................................................................	13
	4.3	Logic to Support NFS Diskless may not be DRD-safe .....................................................................	16
5	Making Control Script Invocations of swremove DRD-Safe ...................................................................		17
	5.1	How to Make Packages DRD-Safe for swremove..........................................................................	17
6	DRD-Safe Packaging Changes..........................................................................................................		19
	6.1	The is_drd_safe Attribute...........................................................................................................	19
7	Making Special Installation Instructions DRD-Safe ...............................................................................		21
Appendix A ......................................................................................................................................			22
	A.1 HP-UX 11i v2 control_utils.........................................................................................................		22
	A.2 HP-UX 11i v2 Commands .........................................................................................................		23