feat(blog): praha feedback has been waiting for 10 days

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+title: Computers in Praha
+date: 2023-05-03
+
+![cell-site-in-praha](/img/b/praha-cell-site.jpg)
+
+## Open Compute
+
+Watercooled and Open Rack V3 chassis + racks were displayed in the exposition
+hall:
+
+- Prototype of a 3U liquid cooled Nokia AirFrame Edge chassis.
+- Qarnot server: around 20 units are deployed per site, for an average of 240
+  motherboards.
+- HPE latest ARM server with an Ampere cpu: RL300, supporting
+  [OpenBMC](https://en.wikipedia.org/wiki/OpenBMC).
+
+## Frontier
+
+This is [the world's first and fastest supercomputer](https://en.wikipedia.org/wiki/Frontier_(supercomputer)).
+I have visited one of the assembly line and server room used in the fabrication
+process.
+
+### Components
+
+The chassis are 1U tall, composed of two servers spread on one motherboard,
+with a total of 8 cpus. The BMCs are on one extension card, directly plugged
+on one side of the motherboard, and connected via a cable to the opposite side
+for controlling the second server.
+
+The chassis are stacked at the backside of the rack, while the power units and
+water pipes are present at the fronside.
+
+Note that each power unit can draw up to 15KW and is vertically plugged in the
+rack.
+
+### Water leaks
+
+Big drainage pipes circulate above the racks, probably the closed water loop.
+Huge recipients with water detectors are present underneath, avoiding the
+fluid to fall down over the chassis.
+
+Thin conductive wires are also present in each chassis. They seem to be
+connected to the motherboard or BMCs extension card. This helps to detect any
+internal leak and gracefully shutdown the servers.