Guidelines on optimization of runtime of EHP4 installation phases

Hi

Our system is SAP ECC 6.0 SP10 without any EHP on HP-UX and Oracle.

Currently we are running EHP4 installation on our sandbox on top of EHP3. We are in preprocessing phase. I observe that a phase MAIN_SHDRUN/ACT_UPG is going on more then 5 hours upto the composing of this message. I can observe activity into the system (SM50).

I was trying to get some information and documentation on optimization of runtime of phases of the EHP4 installation. I tried Installation Guide, and notes attached to the document like SAP Note 1292069 - Add. Info. on upgrading to SAP ERP 6.0 EHP4 SR1 ABAP, but this seems to be not big help for me(or might be I oversee something provided by SAP)

Here my question is, can we have some anchor document or note for optimization of system settings and parameters which will help us to optimize the runtime of different phases of installation. If not for all then at least please suggest for this phase and other for which it is available.

Approx DB Size: 2.8 TB

Best regards

Jaswant