5.3 Channel subsystem summary z14 ZR1 servers support the channel subsystem features of multiple LCSS, MSS, and the  channel spanning that is described in this chapter. The channel subsystem capabilities of z14  ZR1 servers are listed in Table 5-1.  Table 5-1 z14 ZR1 CSS overview Maximum number of CSSs 3 Maximum number of LPARs per CSS CSS0 - CSS1: 15 CSS2: 10 Maximum number of LPARs per system 40 Maximum number of subchannel sets per CSS 3 Maximum number of subchannels per CSS 191.74 K  SS0: 65280 SS1 - SS2: 65535 Maximum number of CHPIDs per CSS 256 Chapter 5. Central processor complex channel subsystem  171