The Code rebalancing problem for a storage-flexible Data Center Network

The paper considers the impact of changing code parameters on the network load, for some given storage-flexible Data Center Network (DCN), i.e. such DCN in which the reliability and the storage volume can be modified during the storage life of the DCN data. Two regimes of the network load are considered: transition (during the migration process) and stationary (at the end of the migration process). Our main result is the derivation of the link between reliability and network load via code parameters; clearly, this link is code-dependent. Two different erasure-coding families are considered as examples (MDS and LDPC codes), to illustrate the dependence in two different coding cases.