SAP Note 28064 - SAProuter during update/upgrade

Symptom:

During update/upgrade, the new SAProuter cannot be written into the executables directory. For example, the error message
cp: cannot create saprouter: Text file busy

Cause and prerequisites

The SAProuter runs and the operating system requires disk space for paging.

Solution
either:
- Shut down the SAProuter before the PUT and restart it afterwards
or:
- Rename the current SAProuter (mv saprouter saprouter.busy)
- Carry out the update
- Delete saprouter.busy after the next time you restart SAProuter