What stood out to me the most is that it's dated July 2016.
Quoting the abstract:
This report examines the partition structures of SGI IRIX disk and optical media, from the
perspective of digital forensics. To date, these structures are poorly documented. Should
investigators encounter such systems and media, they may have difficulty obtaining meaningful
information and evidence from such devices. This report hopes to provide sufficient information
to aid investigators with respect to SGI’s proprietary UNIX environment.
Significance to defence and security
Any computer forensic investigator or analyst charged with acquiring or examining evidence
from SGI computer media will find this report helpful. In the civilian sector, numerous SGI
supercomputers and NUMA systems were sold to academia, R&D agencies, facilities and
institutions, and to businesses alike. For government and military, these systems were acquired
primarily by organizations and agencies conducting R&D, simulations and numerical
calculations, some of which are affiliated to DND and DOD. Law enforcement, whether civilian
or military, may be called upon to investigate or acquire evidence from such systems, as many
remain in service today. The information in this report will be of use to those acquiring evidence
from such systems.
Further into the paper they've reverse engineered most of the struct/byte offset data layout of the VTOC to find partitions on disks/images.