If you received the test dose as an outpatient, you will be admitted to the hospital on Day -8 and will receive fluids by vein. On Days -7 through -4, you will receive by vein fludarabine over 1 hour, clofarabine by vein over 1 hour, and busulfan by vein over 3 hours. You will receive ATG on Days -4 and -3. On Day -3, you will receive a single treatment of low-dose total body irradiation. You will "rest" (not receive chemotherapy drugs) on Days -2 and -1. Day 0 is the day of transplantation, so the negative day numbers are used to label the treatment days before transplant.