Appendix S: UNT Digital Libraries: Risk Analysis and Management Strategy Plan Page: 17
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High
Impact Medium
Low
Low Medium High
Likelihood
It is very difficult to assess the likelihood and impact of hardware obsolescence because it
depends on the repository growth rate as well as developments in hardware, software, and user
behavior. It may affect diverse users in different ways. Degraded performance is the first sign of
hardware obsolescence, but service outages should be expected. The impact could vary from
low to medium (and possibly high, not illustrated) in relation to the components involved, the
services affected, and the duration of any service outage. Hardware obsolescence is
medium-likelihood in the context of repository growth and wider technological change.
There is a risk that large-scale hardware migrations could cause temporary service outages and
lead to data corruption or loss.
Management strategy
The UNT Libraries strategy for minimizing the risk of hardware obsolescence is largely the same
as its strategy for hardware failure. Please see above, for details.
Software failure
Dependencies
The UNT Libraries' Digital Collections and the Digital Libraries Division depend on a variety of
software components to carry out operations and fulfill their mission. The repository uses a
combination of open-source and custom-built software to ingest and transform content, manage
backup, disseminate content, and deliver various services.
It is necessary for the repository to install new software or modify existing software as a part of
normal operations. Software failure is typically confined to bugs or incompatibilities that appear
during or after software changes. The CCSDS' Audit and Certification of Trustworthy Digital
Repositories checklist singles out security patches and firmware updates for special concern
and states that they "are frequently responsible for upsetting alternative aspects of system
functionality or performance" (sec. 5.1.1.4). Software failure could force the Digital Libraries17
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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/m1/18/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .