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Costing

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15 diapositives · 338 Views · Aug 21, 2014

Costing. Life 2 Model. Research (JISC Project) Application to whole operation of Library Attempts to cost common factors Does not take into account certain details. Life Model Formula. L = Complete lifecycle cost over time 0 to t C = Creation Aq = Acquisition I = Ingest

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  1. Costing

  2. Life 2 Model • Research (JISC Project) • Application to whole operation of Library • Attempts to cost common factors • Does not take into account certain details

  3. Life Model Formula L = Complete lifecycle cost over time 0 to t C = Creation Aq = Acquisition I = Ingest BP = Bit-stream Preservation CP = Content Preservation Ac = Access

  4. Life Model Detail

  5. NLW Digital Archive Equipment Costs • Servers in both Machine Rooms (Sun V490) • External Disk Array in both Machine Rooms (Sun Stortek 3200) • Tape Library in one Machine Room (Quantum Scalar i2000) • Optical Library in one Machine Room (Plasmon UDO1 G638) • Large Storage Array in one Machine Room • AMASS Storage Software

  6. NLW Digital Archive Support Costs • Server Support • Disk Array Support • Tape Library Support/Maintenance • Optical Library Support/Maintenance • AMASS Software Support • Solaris 10 Operating System Support

  7. NLW Digital Archive Storage Costs • Tape Media • Tape Slots • Optical Media • Tape Drives – based on access patterns / insertion patterns • Optical Drives – based on access patterns / insertion patterns • Disk Storage Area – based on project sizes

  8. NLW Digital Archive Computing Costs • Data duplicated to provide three versions of a file • Extra copy taken to comply with preservation best practice • Extra copy in Optical Library • Time to taken to copy data • If estimated to take a long time another drive in the libraries will help

  9. NLW Digital Archive Staff Costs • Media takes time to prepare and is a manual process • Taking media off site and to the Copper Rooms • Bringing media back from the Copper Rooms and off site to check • Duplicating tape contents to temporarily replace off site tapes • Media Generation change • AMASS Storage Database Backups

  10. NLW Costing FormulaeMedia Cost Project Size (mb) = Number of Files * Estimated Average File Size (mb) Number of Tapes (1 copy) = Project Size / 381468 mb Number of Optical Cartridges (1 copy) = Project Size / 28661 mb Tape Media Cost = (Number of Tapes * £23) * Number of Copies (4) Tape Slot Cost (10 years) = Number of Tapes * £50 (only one copy is kept in tape library) Media Cost = Tape Media Cost + Tape Slot Cost Total Archive Size = Project Size(mb) * Number of Copies (4) These figures only show the size and number of tapes for 1 copy. Remember there are four copies of the data.

  11. NLW Costing Formulae Insertion Task Time Md5 capture time (mins) = (Time taken to generate md5*Number of Files)/60 Transfer to tape (1 copy in mins) = ((Project Size (mb)/ Tape Drive Transfer Rate)/Number of Drives for project)/60 Optical Transfer is similar to Transfer to tape

  12. NLW Costing FormulaeInsertion Total Time Computer Time of insertion (Hours) = (Transfer to Tape * Number of Copies (4) + Md5 Capture Time)/60 Staff Time for insertion (Hours) = ((Number of Tapes*Preparation Time (10 mins))*Number of Copies (4)) + Time taken to move tapes to Copper Room (10 mins) + Time taken to move tapes offsite (45 mins)

  13. NLW Curation Costs 6 Monthly Staff Curation Time (HOURS) = (Number of Tapes * Online copy check prep time) + ((Number of Tapes * Copper Room copy check prep time)+ Trip Time there and back) + ((Number of Tapes * Offsite copy check prep time) + Trip Time there and back) 6 Monthly Computer Curation Time (HOURS) = (Number of Tapes * Full Tape Read time((Size of Tape/Drive Transfer time)/60) ) + ((Number of Tapes * Full Tape Read time)*2 (Copper Room Copy)) + ((Number of Tapes * Full Tape Read time) *2 (Off site copy) )

  14. Forcasting • Assumptions • No “Crystal Ball” • Growth Rates • Equipment Costs

  15. Forcasting Example