Erasure Code Prioritization

摘要

Example apparatus and methods selectively generate and store erasure codes differently based on priorities associated with the erasure codes or based on conditions in a data storage system (DSS) that protects messages using erasure codes. Producing a systematic erasure code (EC) may be prioritized over producing a non-systematic EC. Producing an EC associated with correcting X erasures may be prioritized over producing an EC associated with correcting Y erasures, X and Y being numbers, X

主权项

1. A method for controlling a data storage system (DSS) that uses erasure codes to provide redundancy for messages, comprising:
accessing a message for which a non-empty set of erasure codes are to be produced; accessing an erasure code generator, where a first portion of the erasure code generator produces a first type of erasure code (EC) having a first priority, and where a second portion of the EC generator produces a second type of EC having a second different priority; selectively producing the set of ECs for the message using the EC generator and the message, where the membership of the set and the order of ECs in the set depend, at least in part, on a generation priority, and selectively storing a member of the set in a data storage device (DSD) in the DSS, where the member and the DSD are selected based, at least in part, on a storage priority.