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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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Life 2 model
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
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



Nlw digital archive equipment costs
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


Nlw digital archive support costs
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


Nlw digital archive storage costs
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


Nlw digital archive computing costs
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


Nlw digital archive staff costs
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


Nlw costing formulae media cost
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.


Nlw costing formulae insertion task time
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


Nlw costing formulae insertion total time
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)


Nlw curation costs
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) )


Forcasting
Forcasting

  • Assumptions

  • No “Crystal Ball”

  • Growth Rates

  • Equipment Costs



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