While working on NW 7.40 installation on SAP Sybase, I found very weird issue where sapinst was not able to complete the step “Configuration of database components”
Solution: Please check the size of mount point /Sybase/SID. That should be around 8 GB free.
During installation of NW components Sybase also install TEMP DB which resides on /Sybase/SID mount point.
As per your requirement, please change the default size of temp DB in sapinst screen but make sure that your mount point /Sybase/SID should be enough to handle the same as other logs & temp file also save there.