The EHPI installation book as well as the central note 1302772 say that if you are using EHPI and you have dialog instances that you need to De-install and Re-install the dialog instance if you have dual stack or java only stack.
Can anyone explain WHY this has to be done, This seems to be a lot of unneccessary work. In our enviironment the kernel directories are shared per the SAP design. The dialog instances are shutdown during down time.
I just got done doing and update on one of my sandbox systems and afterwards I started up my dialog instance(without reinstalling it) with no problems.
I did searches about tlhis but found no similar question
I am updating from NW 7.0 sp18 to Nw EHP1 sp8.
I had also opened a message and this SAP''s response
When the kernel directory is shared with the dialog instances ,
the sapcpe executable automatically copies the new kernel to
the dialog instances also. In this case there is no necessity of
installing new dialog instances.
If the DIR_CT_RUN directory is not shared, then it is mandatory
to install new dialog instances