Hierarchical File Store

The following table shows the percentages of total files held, data stored (measured in GB) and nodes (backup clients) or projects, sub-divided by function for each the part of the University represented. The figures present the break down at the end of December 2001.

DivisionDesktop backupServer backupArchive
(%) files (%) GB (%) nodes (%) files (%) GB (%) nodes (%) files (%) GB (%) projects
Academic Services 10.2 9.7 9.5 10.5 15.2 17.6 44.3 80.1 48.8
Central Administration 0.6 0.6 1.9 3.7 2.8 5.7 0.0 0.0 0.0
Colleges 13.1 10.7 17.4 19.8 9.7 22.1 0.0 0.0 0.0
Continuing Education 0.3 0.4 0.2 1.4 0.8 1.0 0.0 0.0 0.0
Humanities 1.6 1.3 3.4 2.4 1.3 5.5 7.1 11.5 14.6
Life & Environ. Sci. 12.2 13.6 13.7 13.5 15.7 8.4 0.5 0.1 4.9
Maths. & Physical Sci. 42.3 43.2 33.0 24.8 24.5 16.4 32.8 4.9 14.6
Medical Sciences 15.6 16.1 15.1 20.0 23.4 16.9 15.3 3.3 17.1
Other Related Bodies 0.2 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0
Paying Etc 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0. 0 0.0
Social Sciences 3.2 3.1 4.0 4.1 6.7 6.0 0.0 0.0 0.0
University Companies 0.7 0.5 1.6 0.1 0.1 0.1 0.0 0.0 0.0
Total Values/Sizes 119595799 13469 1958 90145440 11238 403 1202632 6917 41

The Archive storage figures require clarification. The ‘Academic Services’ entry includes the storage of 4TB of data collected under the Celtic Manuscripts project and ought potentially to be re-classified under the Colleges division. With this removed, the total Archive storage is c. 20% of Desktop or Server storage. The Humanities Division is the next significant user of Archive storage after Academic Services (which has the largest number of projects and project data excluding Celtic Manuscripts). At present, Assets/Legal Deposit HFS costs are negligible, but are expected to grow.

The next table shows the percentage growth in services over the period July to December 2001, and while some individual items reduce (due to consolidation of services for example), there is overall growth in all categories:

DivisionDesktop backupServer backupArchive
(%) files (%) GB (%) nodes (%) files (%) GB (%) nodes (%) files (%) GB (%) projects
Academic Services 1.0 10.0 -9.1 8.5 21.4 9.9 -5.0 2.5 0.0
Central Administration 33.0 24.1 7.9 18.1 26.7 4.4 0.0 0.0 0.0
Colleges 23.0 14.8 10.0 4.2 3.6 14.6 0.0 0.0 0.0
Continuing Education 36.9 5.5 0.0 35.8 20.7 0.0 0.0 0.0 0.0
Humanities -0.6 9.6 -16.7 37.4 30.3 22.7 16.2 21.5 16.7
Life & Environ. Sci. -3.8 6.8 -1.1 17.2 15.6 11.8 1.1 0.0 0.0
Maths. & Physical Sci. 13.2 20.1 4.3 21.2 27.0 15.2 3.4 15.9 0.0
Medical Sciences 18.3 19.2 2.7 23.9 27.5 11.8 1.6 3.5 0.0
Other Related Bodies -2.2 14.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Paying Etc 16.7 20.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Social Sciences -3.8 -7.5 -20.5 38.6 11.5 54.2 0.0 0.0 0.0
University Companies 44.5 29.7 15.6 100.0 100.0 100.0 0.0 0.0 0.0
Overall Growth 11.6 15.6 1.6 17.7 21.2 15.6 0.3 5.4 2.4

Whilst all services have shown overall growth the average percentage share (or usage) by division has remained constant to within ±2%.

Charts (figures Figure 1, Desktop Storage (GB) to Figure 3, Archive Storage (GB)) detail the amount of data (in GB) stored by division each month in each category; while further charts (figures Figure 4, Desktop Storage Share (%) to Figure 6, Archive Storage Share (%)) show the amount by percentage over the same period. Both the desktop and server backup services have grown in terms of files saved and GB stored (and historically have approximately doubled every eighteen months since 1995) with server backups showing a slightly faster rate of growth.

Desktop Storage (GB)
Desktop Storage (GB)
Server Storage (GB)
Server Storage (GB)
Archive Storage (GB)
Archive Storage (GB)
Desktop Storage Share (%)
Desktop Storage Share (%)
Server Storage Share (%)
Server Storage Share (%)
Archive Storage Share (%)
Archive Storage Share (%)

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