The /dev/sysdump and /dev/sysdumpctl special files support system dumping. Minor device 0 of the sysdump driver provides the interfaces for the system dump routine to write data to the dump device. The sysdump driver also provides interfaces for querying or assigning the dump devices and initiating a dump.
The dump special file is part of Base Operating System (BOS) Runtime.
The dmp_add kernel service, dmp_del kernel service.
RAS Kernel Services in AIX Kernel Extensions and Device Support Programming Concepts.
System Dump Facility in AIX Problem Solving Guide and Reference.