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Digital Stacks

Rather than boxes, shelves, and climate controlled environments, digital information must be stored in containers, file systems, and secure servers. PeDALS will use LOCKSS technology because it comes very close to the requirements described in RLG's Checklist for a Trusted Digital Repository. LOCKSS is designed to distribute copies on numerous, geographically dispersed servers. Use of multiple servers also allows different servers to be administered by more than one individual, providing another failsafe to protect the content. LOCKSS uses hashing to check for file integrity and automatically correct errors based on a voting algorithm. That algorithm addresses both issues of physical integrity (bit degradation), as well as intentional, malicious hacks to alter the content. LOCKSS uses a specially hardened, write-only operating system that makes it difficult to hack. As important, LOCKSS' use of redundant arrays of inexpensive servers makes this technology affordable to many repositories.

The LOCKSS system will be used to store the AIPs will be protected by a robust firewall and access will be restricted to repository staff. The DIPs used for public access will be stored on a separate system. Similarly, the accessions register database will be protected by firewalls and have limited access, while the metadata for publicly accessible records will be stored in a separate database to avoid the possibility of inferring the content of confidential or restricted records from the metadata.