SYSIBMADM is an IBM-supplied which was created during the installation of, or upgrade to, OS/400 V6R1. Though SYSIBMADM is does not follow the Q library naming conventions, it is considered a system supplied library, like QSYS, and it and its contents should not be deleted or altered.
Currently the library is empty of contents.
What's new for V6R1
"SYSTOOLS and SYSIBMADM schemas"