I've a system that has been running CentOS 6 64-bit for almost 4-years and I want to start the move to CentOS 7 64-bit. I run software RAID-1 with LVM everywhere except /boot which is a standard partition RAID-1.? There are 2 areas that concern me greatly about this migration: 1.? How do I duplicate my current grub configuration file that supports a failure of /dev/sda to grub2? 2.? How do I install CentOS 7 but use my existing hard drive layout so I only format specific OS file systems.? My drive layout goes back to the original proposed FHS layout.? The separate partitions are: /boot??? ??? 1GB /??? ??? ??? ???? 6GB /home??? ??? 4GB /opt??? ??? ??? 4GB /tmp??? ??? ??? 2GB /usr??? ??? ???? 12GB /usr/local??? 2GB /var??? ??? ??? ? 8GB swap??? ??? ??? 16GB Plus many other file system dedicated to specific applications and data. When I moved from CentOS 5 to CentOS 6 all of the OS partitions were formatted except /home.? All went extremely well then. But I don't see a way to do that with CentOS 7. Is there some detailed installation instructions showing some advanced methods? TIA Gene -- Eugene Poole Woodstock, Georgia