Hitachi TrueCopy for z/OS User Guide (T1711-96024, November 2011)

220 Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
Figure 86 Combination 3: MODE 85,86 = OFF,ON – Threshold 1/2/3 = 50/60/70%
Figure 87 Combination 4: MODE 85,86 = ON,ON – Threshold 1/2/3 = 60/70/80%