Do you know how to check this by myself ?
If you have access -- many sites restrict access to the data sets mentioned below -- you can find out. First, there most likely will be SYSn.IPLPARM, which will be a PDS with multiple members (n may be anything from 0 to 9). One of them is the load parameter being used for the LPAR; you may have to check the IPL documentation to see where the data set is and which member is used. That member will have two relevant lines:
for example. Look in the listed PARMLIB for member IEASYSXY (where XY comes from the SYSPARM line). In this member there usually is a line that looks like
In the same PARMLIB, find the PROGXY member (or PROGXY and PROG00 members depending upon what is in the PROG= statement). The linklist will be defined in one of the PROGnn members. The DB2 libraries will be part of the linklist definitions.