CentOS / Redhat: Create Software RAID 1 Array in Categories CentOS, RedHat and Friends, Storage last updated May 27, 2010Recently, I’ve added another 73GB SAS disk to my Linux server after the installation. I’ve 30GB empty partition on old hard disk. How do I convert old /dev/sda3 and new /dev/sdb1 (both 30GB) into RAID 1 to improve NFS server speed and reliability?