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.
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 within a single IPU-M2000 unit or within several units connected by IPU-Link cables |
IPU-Gateway |
A device that disaggregates the server(s) and the four IPUs in the IPU-M2000 across a RoCE network, provides external IPU Exchange Memory, and enables IPU scaleout across 100GbE (GW-Links) for rack-to-rack connectivity |
GW-Link |
High speed communication links that connect IPU-M2000s horizontally across IPU-POD64 racks. Special cables are required for GW-Links between IPU-M2000 units |
IPU-Link |
High speed communication links that connect IPUs within an IPU-M2000 and between IPU-M2000s within an IPU-POD64. Special cables are required for IPU-Links between IPU-M2000 units |
PDU |
Power Distribution Unit |
RDMA |
Remote DMA |
RNIC |
RDMA Network Interface Controller |
RoCE |
RDMA over converged Ethernet |
ToR |
Top of Rack. Often used in combination with the ToR RDMA switch that is placed on top of the IPU-M2000 stacked units |