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DuraCloud: Data Integrity Monitoring in the Cloud

Digital Preservation Partners Meeting July 21, 2010 Andrew Woods awoods@duraspace.org. DuraCloud: Data Integrity Monitoring in the Cloud. What is DuraCloud? Fixity service use case Basic flow Cost and performance Next steps. Overview. What is it?.

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DuraCloud: Data Integrity Monitoring in the Cloud

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  1. Digital Preservation Partners Meeting July 21, 2010 Andrew Woods awoods@duraspace.org DuraCloud: Data Integrity Monitoring in the Cloud

  2. What is DuraCloud? Fixity service use case Basic flow Cost and performance Next steps Overview

  3. What is it? Cloud-based service offered by the not for profit organization, DuraSpace An open source, cloud storage/compute application Focused on preservation support and Data access for reuse and sharing Cloud storage across multiple commercial & non-commercial providers An open canvas for cloud-based services

  4. Fixity use case DuraCloud user has replicated content across one or more cloud stores Need for periodic verification of bit integrity Seeking balance between cost & trust

  5. 0: Content Topology

  6. 1: Data load

  7. 1a: Replicate

  8. 1b: MD5 export

  9. 2: Determine MD5s* ...running fixity service

  10. 3: Compare & Report

  11. 0: Trust vs. Cost Trust in... Underlying storage providers DuraCloud and opensource software Requester of service (administrator)

  12. 1: Trust vs. Cost Three approaches: Request stored value [inexpensive & fast] Stream out content & re-calculate [compute intensive & slow] Stream out content & re-calculate with salt [user intensive, compute intensive & slow]

  13. 2: Determine MD5s* • Options for providing • expected MD5 • With initial listing • After MD5 calculation

  14. 2a: MD5 at non-primary Additional cost of processing content not local to compute

  15. Next steps Scalability MD5 calculation across Hadoop cluster Multi-administration efficiency On-demand compute at secondary provider Event logging

  16. Thank you Requesting comments & review https://wiki.duraspace.org/display/duracloud/Fixity+Service http://duracloud.org https://wiki.duraspace.org/display/duracloud/DuraCloud https://svn.duraspace.org/duracloud/trunk/

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