Terminology

Archive Master

Fileset

A storge pool on a node. Authoritive information for the fileset is stored locally on the node. For simplicity sake, replication occurs to entire filesets.

Fileset Group

A set of identical filesets spread across different nodes. Each member of a fileset has a locally authoritative copy of all other group members. The first member of a fileset is chosen as a fileset group master. All members of a group are responsible for ensuring they are in sync with the master

Fileset Group Master

The fileset in a fileset group that is responsible for pushing modifications to group information to other members. It is also the node that accepts new data for a fileset and pushes it out to all members. It also issues purges to other group members.

Node

A data storage node that contains filesets.

Package

The unit of preservation. A block of bits identified by a digest across the block. The package can contain many files. Further information is available on the package format

Storage Class

A list of storage requirements. It is composed of 1 or more fileset groups File Groups. Clients request a storage class for packages they wish to ingest

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