Which managed systems are connected to the HMC can be queried with the command “hmc lssysconn“, here is an example output from hmc01:

$ hmc lssysconn hmc01
TYPE_MODEL_SERIAL_NUM  STATE          RESOURCE_TYPE  IPADDR         ALT_IPADDR   SP           SP_PHYS_LOC
8286-41A*32C4D4W       Connected      sys            172.16.100.13  unavailable  primary      U78C9.001.VYR0UCG-P1
8284-22A*326E12W       Connected      sys            172.16.100.12  unavailable  primary      U78CB.001.VYR0AI4-P1
8284-22A*326E13W       Connected      sys            172.16.100.15  unavailable  primary      U78CB.001.VYR0DM6-P1
$

There are 2 managed systems of the type 8284-22A (S822) and one 8286-41A (S814). Since the managed systems were registered by the LPAR tool and are therefore known, they can also be displayed more easily using “ms show“:

$ ms show
NAME  SERIAL_NUM  TYPE_MODEL  HMCS   MODEL_NAME
ms01  326E12W     8284-22A    hmc01  IBM Power System S822
ms02  326E13W     8284-22A    hmc01  IBM Power System S822
ms03  32C4D4W     8286-41A    hmc01  IBM Power System S814
$

The model name is then also displayed in this output.