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== Equipment Overview ==
The EHL consists of a two dual-thermal-zone (cold/hot) rackmount cabinet cabinets with power conditioning and backup, power distribution, thermal monitoring, and 1- and 10-gigabit network services. This cabinet These cabinets supports a large number of hyperscale and SOC-based ARM computers for various applied research projects.
== Equipment Detail ==
=== Cabinet ===
Each of the two EHL cabinet cabinets is a [http://www.silentium.com/?page_id=33 Silentium Accoustirack Active], a full-height acoustically-insulated rackmount cabinet with two fan units. The lower fan unit takes air from outside the cabinet and blows it up the front of the rackmount equipment area (cold zone). Air passes through the individual devices and is vented out the back of each unit into the hot zone. A second fan unit exhausts air from the hot zone out the top of the cabinet.
Each of the fan units includes active noise cancellation so that the loaded rack can be operated in a software development lab context.
After the fan units are installed, there are [http://en.wikipedia.org/wiki/Rack_unit 33u] available for other devices.
=== Power ===
Power to each cabinet is provided by two 115 volt, 15 amp, 60 cycle circuits that power two independent APC 1.5 kW rackmount power supplies. Each of the power supplies has a network interface for remote monitoring and control.
The UPSes feed two Raritan Dominion power distribution units (PDUs), mounted vertically up the sides of the cabinet at the back, plus a third 1u horizontal unit. The PDUs act like long power bars, but have control and monitoring systems so that the per-outlet current consumption can be measured and remotely monitored over the network, using snmp or http protocols. Each outlet can also be switched on or off under network control.
Where possible, devices have been configured with dual power supplies. This means that many of the devices in the EHL are plugged into both two PDUs and can continue to operate when power is cut to one of the two supplies. This permits the EHL equipment to be rewired without any downtime; it also guards against downtime due to PDU, UPS, or PSU failure.
Devices which are not configured with dual PSUs are connected to just one of the PDUs.
The total draw of the EHL equipment installed in the first cabinet as of January 2015 was approximately 1.8 kWh under load. The current power system can support a little over 3 kWh; the cabinet supports thermal exchange of about 8 kWh.
=== Environmental Monitoring ===
One of the PDUs in each cabinet is equipped with a string of three environmental sensors. These are laid out diagnonally across the EHL, so that the air intake temperature, mid-cabinet hot zone temperature, and air exit temperatures are monitored, as well as the humidity.
In January 2015, typical intake temperatures on the EHL were 25-27C and exhaust temperatures were 36-37C.
=== Networking ===
The connection between the EHL cabinets is made by a fibre optic 10 gigabit connection.
Connections between the EHL LAN and the outside world are provided by a [http://www.compulab.co.il/utilite-computer/web/utilite-overview Utilite], a small ARM computer installed in cabinet 1. This computer acts as a an ARM64 [http://www.diablotin.com/librairie/networking/firewall/ch04_02.htm dual-homed host] that provides firewall, NAT, forwarding, DNS, and VPN endpoint services.
=== Storage ===
=== Terminal Server ===
Many of the computers installed in the EHL do not have video output (because they're are not intended for desktop applications). Most of these have a serial port; in many cases, this is a virtual serial port which is accessed using the ICMP IPMI SOL (Serial-over-LAN) or similar protocol on the network. Since this is not a TCP/IP protocol, the client must run somewhere on the LAN.
For systems that do not have a working ICMP IPMI engine, each EHL cabinet is equipped with a [[Cyclades Terminal Server]] which provides remote access to 32 serial ports. A remote user can connect to a selected port to monitor and control the connected system.
=== Display ===
=== 64-Bit ARM Compute ===
The EHL has over 100 cores of ARM64 compute, provided by a number of computers from multiple vendors. These computers provide a build system and testing platforms for [http://leapproject.ca the LEAP project], software optimization, and are used for applied research on ARM64 systems.
== Funding ==
=== Pidora Koji System ===
The Koji buildsystem used for the [[Pidora]] project, [http://koji.pidora.ca koji.pidora.ca], uses Calxeda nodes in the EHL as build servers, and will may in the future use a system within the EHL as a hub. This system is publicly accessible.
=== Student Access ===
Students in [[SPO600]] and [[SBR600]] are given remote access to some EHL ARM computers for specific projects and labs, when they are not being used for OSTEP applied research projects.