The maximum number of pairs per storage system is subject to restrictions, such as the number of cylinders used in volumes or the number of bitmap areas used in volumes. The maximum number of pairs might be smaller than the number listed in the System requirements and specifications table because the amount of used bitmap area differs depending on the user environment (volume size).
TrueCopy supports a maximum of 65,280 pairs. If Command Control Interface is used, a command device must be defined for each product and the maximum number of pairs is calculated by subtracting 1 from the maximum number of pairs shown in the specification.
The number of LDEVs, not the number of LUs, is used to determine the maximum number of pairs.