https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7...

Backup of " / " {root} directory:

blkid -o list

lsblk

fdisk /dev/vda

For executing it, have to follow this nice tutorial - https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/storage_administration_guide/#s2-disk-storage-parted-create-part

yum install *sdt-devel libdb-devel qdbm-devel libdb-sql-devel libdb4-devel libdbi-devel libjpeg-turbo-devel libvpx-devel libpng-devel libXpm-devel recode-devel net-snmp-devel

yum install systemd-devel  enchant-devel aspell-devel