Michael is correct. The HP documentation states under Interfaces):
Network: RJ-45 (10/100/1000 bits/s Ethernet) (1)
Remote Management: HP ProLiant Onboard Administrator (Powered by the HP Integrated Lights-Out 100i Baseboard Management Controller)
The server only has a single NIC.
I remembered that my VM had "Dynamic Memory" enabled so I tried running the VM with "Dynamic Memory" turned off. After stress-testing the VM, all 12 physical cores lit up. Happy for anyone out there to extend this answer by explaining why this solved my issue.
You may disable this predictive failure drive and this will initiate rebuilding with spare drive if you have it in configuration(you have):
hpacucli controller slot=6 physicaldrive 1I:1:1 modify disablepd
The second variant is to change drive spare activation mode:
hpacucli controller slot=6 modify spareactivationmode=predictive
But it is not supported for ...