RAID1 on RED HAT 6.0

Hi, I have redhat linux 6 with two scsi hard disk A B. Each have three partitions.I want to implement software raid 1.The partitions are of same size on both hard disk. HARDDISK A was running for the last 1 year. HARDDISK B is just added. Now how will i mirror the two so that my data dont

RAID 1 SETUP redhat 6

Hi, I have redhat linux 6 with two scsi hard disk A B. Each have three partitions.I want to implement software raid 1.The partitions are of same size on both hard disk. HARDDISK A was running for the last 1 year. HARDDISK B is just added. Now how will i mirror the two so that my data dont