Managing Serviceguard Extension for SAP, December 2007

Planning the Storage Layout
Database Instance Storage Considerations
Chapter 276
NOTE Using tar or cpio is not a safe method to copy or move directories to
shared volumes. In certain circumstances file or ownership permissions
may not correctly transported, especially files having the s-bit set:
/sapdb/<SID>/db/pgm/lserver and /sapdb/<SID>/db/pgm/dbmsrv.
These files are important for the vserver process ownership and they
have an impact on starting the SAPDB via <SID>adm. These files should
retain the same ownership and permission settings after moving them to
a shared volume.
Database and SAP instances depend on the availability of
/sapdb/programs. To minimize dependencies between otherwise
unrelated systems, it is strongly recommended to use a dedicated
SAPNFS package, especially in case that the cluster has additional SAP
application servers installed, more than one SAPDB is installed or the
database is configured in a separate DB package. Keeping local copies is
possible, though not recommended because of the fact that there are no
administration tools that keep track of the consistency between the local
copies of these files on all the systems.