2026-10-29 17:30:18Dave LeBlanc:
Operations updated on Thu Oct 29 17:29:58 2026
sysadmin/operations.md ..
@@ 8,7 8,8 @@
- Patrick Cahalan, x3290
Special access for networking work includes
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- Joe Monaly, x2109
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- Joe Monaly, x2109
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The historical access list can be found below.
The CMS systems administration team is located in 112 Annenberg.
@@ 17,7 18,9 @@
The Annenberg Server Room was designed based upon the historical usage of compute resources by the (then-CS) CMS faculty, projected out to 2025 using the EPA's projected guideline for future power consumption trends. Barring a cutover to DC power supplies or some other major change in rackmounted server power supplies, this represents a conservative but fiscally responsible baseline for the first 15 years of occupation of the building by the department. Any major computing effort that exceeds the design parameters of the room will have to be accomodated elsewhere on campus.
## Cooling
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The server room is supplied by a large (8") chilled water feed that enters the Annenberg building at grade on the north side of the building near the auditorium, travels up into the ceiling at that point, cuts across the northern hallway and into the janitorial closet (1J1), where it drops below the floor and enters the server room. The emergency shut-off valves for this chilled water pipe are located in 1J1; in the event of a catastropic failure of pipe integrity, the shutoff valves must be engaged in that room. The key to the janitorial closet is located in 112 Annenberg.
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The server room is supplied by a large (8") chilled water feed that enters the Annenberg building at grade on the north side of the building near the auditorium, travels up into the ceiling at that point, cuts across the northern hallway and into the janitorial closet (1J1), where it drops below the floor and enters the server room.
+
The emergency shut-off valves for this chilled water pipe are located in 1J1;
+
in the event of a catastropic failure of pipe integrity, the shutoff valves must be engaged in that room. The key to the janitorial closet is located in 112 Annenberg.
The server room consists of four rows of 5 self-enclosed cabinets with internal cooling sidecars manufactured by Rittal corporation, sharing a common plenum. One of the four rows has four cooling units, the remaining three rows have five cooling units. The row with four cooling units has a capacity of approximately 22kW per cabinet, the rows with five cooling units have a capacity of approximately 28kW per cabinet. Since the rows share a common plenum, it is possible to exceed the base capacity as long as the other cabinets in the row are under the top capacity and the differential is not so great as to impact the airflow in the over-subscribed cabinet. In any event, it is not expected that CMS will reach heat load capacity in any cabinet in the immediate future.
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There is a private network backnet in 1T1, originally for monitoring of the physical infrastructure. This network is supported by two 48-port 100 mbs switches. Currently, the configuration for the private network is as follows:
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Cabinet 1.1 is 10.1.1.0 - 10.1.1.255 Cabinet 1.2 is 10.1.2.0 - 10.1.2.255 Cabinet 1.3 is 10.1.3.0 - 10.1.3.255 ... Cabinet 2.1 is 10.2.1.0 - 10.2.1.255 Cabinet 2.2 is 10.2.2.0 - 10.2.2.255 ... Cabinet 3.1 is 10.3.1.0 - 10.3.1.255
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Cabinet 1.1 is 10.1.1.0 - 10.1.1.255
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Cabinet 1.2 is 10.1.2.0 - 10.1.2.255
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Cabinet 1.3 is 10.1.3.0 - 10.1.3.255 ...
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Cabinet 2.1 is 10.2.1.0 - 10.2.1.255
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Cabinet 2.2 is 10.2.2.0 - 10.2.2.255 ...
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Cabinet 3.1 is 10.3.1.0 - 10.3.1.255
Generally, a cabinet with the identifying number N.M will possess the private address space 10.N.M.1 - 10.N.M.255.
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Initially, all devices on the backnet will be on a single subnet, and thus use 255.255.0.0 as their broadcast address, with the bastion host serving as a gateway.
The 1T1 room is described more fully in the attached documents: