In MVS, an identifier of a logical group.It is the base value used by the real storage manager and the auxiliary storage manager to compute a logical page identifier (LPID). For example, all pages of a virtual I/O data set may be represented by a single LGN.; 在IBM的操作系统MVS中,一种逻辑组的标识符, 它是实存管理程序和辅存管理程序计算逻辑页面标识符(LPID)的基值。例如,一个虚拟输入 输出数据集的全部页面可以用一个LGN表示。