Private addresses

Here is how the private addresses work. Form:

10.XXX.YYY.ZZZ

XXX

• First digit: future use
• Second digit: cluster # ; 0=UCSF legacy, 1=UofT, 2=UCSF new
• Third digit: future use

YYY

• First digit: 0=private network ; 1 = IPMI
• Second digit: rack number (0-7)
• Third digit: 0 = physical, 1,2,3,4... = is a VM

ZZZ

• If physical, then second and third digits = physical location in rack.
• If virtual, then serial number, starting from 1.
• Use first digit if there are 4 machines in 2U, as in SiM 4-in-1 2U machines.

Examples

• 10.0.20.12 - UCSF legacy cluster 0 (0), physical computer located in slot 12 (and possibly above) of rack 2
• 10.20.26.11 - UCSF new cluster 2 (20), VM hosted in rack 2, this is the 11th VM hosted on the the sixth VM host in that rack
• 10.10.110.9 - Toronto cluster 1 (10), this is the IPMI address for a physical machine in rack 1, in slot 9 (and possibly above)
• 10.20.20.111 - UCSF new cluster (20), rack 2, this is a 4-in-1 computer in slot 11 and 12.

Clear as mud?