db2 8.1 fp13 on Linux for zSeries (64-bit)

Every invocation of db2pd except for the "-version" and "-osinfo"
options gives following message:

=======================================
Database Partition 0 -- Database FOO_DB -- Active
Changing data structure forced command termination.
=======================================

We've also running DB2 on AIX (same db2 level, but 32-bits), which has
no problems with db2pd.
Is anyone aware of any known issues with db2pd specifically for
zSeries and/or 64-bits?

--
Jeroen