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diff --git a/src/b/2023-05-computers-praha.md b/src/b/2023-05-computers-praha.md new file mode 100644 index 0000000..3199601 --- /dev/null +++ b/src/b/2023-05-computers-praha.md @@ -0,0 +1,44 @@ +title: Computers in Praha +date: 2023-05-03 + + + +## 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. |