Protecting object data from loss

ILM rules provide you with two mechanisms to protect object data from loss: replication and erasure coding.

Replication

Protecting object data from loss through replication means that exact copies of object data are made and stored to multiple Storage Nodes or Archive Nodes. ILM rules dictate the number of copies made, where those copies are made, and for how long they are retained by the system. If a copy is lost as a result of a Storage Node loss, the object is still available if a copy of it exists elsewhere in the StorageGRID Webscale system.

Erasure coding

Protecting object data from loss through erasure coding means that an erasure coding scheme is applied to object data. The erasure coding scheme breaks object data into data and parity fragments, which are distributed across multiple Storage Nodes. If fragments are lost, object data can still be recovered through the information encoded in the remaining fragments.