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1. Overview

The IPU‑POD₁₂₈ is a rack solution containing 32 IPU-M2000s, up to four host servers, network switches and IPU-POD software. There are 128 Mk2 GC200 IPUs in total with four IPUs in each IPU-M2000. For more information on IPU-POD systems available from Graphcore see https://www.graphcore.ai/products.

Warning

This guide is for properly trained service personnel and technicians who are required to install the IPU‑POD₁₂₈.

If you have any questions then please contact your Graphcore representative or use the resources on the Graphcore support portal: https://www.graphcore.ai/support.

1.1. Acronyms and abbreviations

This is a short list that describes some of the most commonly used terms in this document.

Table 1.1 Glossary
Term	Description
AOC	Active optical cable
BMC	Baseboard Management Controller. Standby power domain service processor doing system hardware management.
BOM	Bill of Materials
GCD	A graph compile domain is operated by a single poplar instance within the system, either for a single IPU-M2000 or for several IPU-M2000s connected by IPU-Link cables.
GW-Link	High speed (100 GbE) communication links that connect IPU-M2000s horizontally across IPU‑POD₆₄ racks. Special cables are required for GW-Links.
IPU-Gateway	A device that disaggregates the server(s) and the four IPUs in the IPU-M2000 across a RoCE network, provides external IPU memory, and enables IPU scaleout across 100 GbE connections (GW-Links) for rack-to-rack connectivity.
IPU-Link	High speed communication links that connect IPUs both within and between IPU-M2000s in a Pod. Special cables are required for IPU-Links.
Logical rack	A logical rack is a space in one or more physical racks occupied by a single Pod. Since the standard racking of a single Pod may not be possible within one physical rack, we use the term “logical rack” to refer to the set of components making up the single Pod, regardless of where they may be physically installed.
PDU	Power Distribution Unit
RDMA	Remote DMA
RNIC	RDMA Network Interface Controller
RoCE	RDMA over converged Ethernet
ToR	Top of Rack. Often also used as a term for the ToR RDMA switch that is placed on top of the IPU-M2000s.

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