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 LtLt =C+Aq t +I+BP t +CP t +Ac t L= Complete lifecycle cost over time 0 to t C= Creation Aq= Acquisition I= Ingest BP= Bit-stream Preservation CP= Content Preservation Ac= Access

Life Model Detail AcquisitionIngestBit-stream Preservation Content Preservation Access SelectionQuality Assurance Repository Administration Preservation Watch Access Provision Submission Agreement MetadataStorage Provision Preservation Planning Access Control IPR & LicensingDepositRefreshmentPreservation Action User Support Ordering & InvoicingHoldings Update BackupRe-ingest ObtainingReference Linking InspectionDisposal Check-in

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 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 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 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 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 Project Size (mb) = Number of Files * Estimated Average File Size (mb) Number of Tapes (1 copy) = Project Size / mb Number of Optical Cartridges (1 copy) = Project Size / 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.

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 Task 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 Costing Formulae Insertion Total Time

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) ) NLW Curation Costs

Forcasting Assumptions No “Crystal Ball” Growth Rates Equipment Costs

Forcasting Example