EOS Overview
 
EOS  Architecture Whitepaper
Basic EOS architecture abstract, includes a layout and relationship of Linux Kernel, Agent and SysDB too.
EOS  Extensibility at a Glance
EOS is very extensible, so user can modify or add functions to fit  their own need. "Run what you want", "Choose your own path", so cool  phrases are.
 
7100 Series
7100  Series Q&A
http://www.aristanetworks.com/media/system/pdf/7100_Datasheet.pdf
FAQ such as;
Q15:     What can I use the USB port for?
A15:     The USB port supports a standard USB flash  device and can be used for booting, storing or transporting the boot  images and config files.
 
RFC 2544 Latency Testing on the Arista 7100 Series
http://www.aristanetworks.com/en/products/7100/latencyreport
The result of latency test.
 
7500 Series
Arista 7500: Performance
http://www.aristanetworks.com/en/products/7500series/performance
Basic architecture of 7500. It is different from CLOS based 7100. 7500 has Full Mesh structure.
Cloud Networking Solutions (White Papers)
http://www.aristanetworks.com/en/solutions
A lot of white papers. For example, the following one explains  important architecture issue, for example, how Arista handle huge buffer  and etc.
Switching  Architectures for Cloud Network Designs