Appendix S: UNT Digital Libraries: Risk Analysis and Management Strategy Plan Page: 14
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administrators consult vendors for additional information and advice, taking into account the
cost of hardware and future maintenance.
Large-scale hardware migration is carried out by systems administrators and programmers from
the Digital Libraries Division and Lib-TACO. Staff test and evaluate new hardware in isolation
before moving the repository to the new component(s). In addition to tests and checks carried
out by automated monitoring programs, staff manually assess changes by examining samples
of relevant content. Staff evaluate changes for their effect on the integrity and understandability
of information, the speed and interoperability of the system, and the accessibility and usability of
disseminated content. Whenever hardware changes involve migrating data, the repository
performs checksum and file size tests to validate the integrity of information.
The Digital Libraries Division and Lib-TACO carry out regular backup of data, databases, and
applications according to local standard backup practices. These backups are intended to serve
as the basis for restoration of server infrastructure materials in the event of data corruption or
loss. Data stored as part of the UNT Libraries' Coda repository is migrated between two storage
facilities, one in the Willis Library, and one in the UNT System Data Center at the UNT
Discovery Park research campus.
Storage media failure that leads to data loss
Dependencies
Storage media failure refers to mechanical failure, physical degradation, or magnetic failure in
disk drives that may lead to data corruption or loss. The failure of multiple drives in the RAID
array may lead to data loss and cause a service outage until Lib-TACO and the Digital Libraries
Division can restore the affected content from backup or other replicated copy of the data.
Media failure can be considered a subset of hardware failure, but it is analyzed here as a
stand-alone topic because of the critical impact of media refreshment on the long-term
preservation of digital information.
Likelihood and impact assessment14
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Phillips, Mark Edward; Krahmer, Ana; Tarver, Hannah; Alemneh, Daniel Gelaw & Waugh, Laura. Appendix S: UNT Digital Libraries: Risk Analysis and Management Strategy Plan, text, October 2015; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1040560/m1/15/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .