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