Network Coded Storage with Multi-resolution Codes
Ulric J. Ferner (Massachusetts Institute of Technology )
APPLIED SIGNAL PROCESSING SERIESDATE: 2013-11-21
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
We propose a network coded storage (NCS) system for data center video-streaming applications. In particular, files stored on drives are pre-network coded across multi-resolution (MR) layers. We explore the characteristics of this concept and compare it to a modern uncoded storage (UCS) scheme. We use Markov processes to model the transactions of different arrivals and departure types and show that the process structure is predominantly constrained by I/O access bandwidth limitations. We illustrate that the NCS scheme achieves a lower saturation probability than the UCS scheme under a large number of network conditions, including variations in server load, storage allocation between layers, and arrival request-type ratios. More specifically, we find that NCS can in some cases provide an order of magnitude in saturation probability gains over UCS systems. Finally, we show that NCS can be used to reduce required drive infrastructure in data centers.
