  Accessing the data in the failed disk (degraded read) with low latency is
crucial for an erasure-coded storage system. In this work, the maximum distance
separable (MDS) array code with the property of degraded-read friendly (DRF) is
discussed. For the DRF MDS array code with 2 redundant nodes and the
sub-packetization level of 2, the lower bound of its access bandwidth is
derived.
