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RACS: A Case for Cloud Storage Diversity

RACS: A Case for Cloud Storage Diversity. Hussam Abu- Libdeh , Lonnie Princehouse Hakim Weatherspoon Cornell University. Problem. Vendor Lock-in: Longer time they use one cloud provider  more data stored in this cloud provider

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RACS: A Case for Cloud Storage Diversity

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  1. RACS: A Case for Cloud Storage Diversity HussamAbu-Libdeh, Lonnie Princehouse Hakim Weatherspoon Cornell University

  2. Problem • Vendor Lock-in: Longer time they use one cloud provider  more data stored in this cloud provider  harder and more expensive to transfer their data out (transfer in $$$$, transfer out $$$$)  Lock in one cloud provider  More vulnerable for price hikes/data center failures(Two main problems)

  3. Internet Archive--Data Transfer

  4. Internet Archive—Read/Write

  5. Stuck in one cloud provider • Outage and operation failure: physical failure • Google Cloud unavailable • Microsoft data center failure in Oct. 2009 • Economic failures: budget now allowed • Emerging new cheaper cloud • Current cloud provider increase price

  6. How to guard against Vendor Lock-in • First thought: • Why not replicate their data into multiple providers? • Could not; three replicas, too expensive • Another way to create redundancy: • Error Correcting code (such as RAID 5)

  7. Preliminary knowledge: RAID 5

  8. Redundant Array of Cloud Storage • Consider each cloud provider as a disk in RAID.

  9. Design • Implemented as Proxy between client application and n- cloud storages • Strip data into m pieces, put them into m clouds, and generate (n-m) redundant data.

  10. Distributed RACS

  11. Failures Recovery • Error Coding Recovery

  12. Cost of hosting on the cloud

  13. Cost of Switching Vendors

  14. Tolerant a Vendor Price Hike

  15. Different Scenarios (1) • Upload Snapshot

  16. Different Scenarios • Vendor Migration

  17. Different Scenarios (3) • Restore snapshot

  18. RACS performance

  19. Conclusion • Identified an important problem: vendor lock-in • Proposed Redundant Array of Cloud Storage to solve this problem using erasure coding. • Tradeoff between overhead expense and vendor mobility • Simulations and experiments to prove the virtue for RACS.

  20. Reference [1] RACS: A Case for Cloud Storage Diversity. Hussam Abu-Libdeh, Lonnie Princehouse, Hakim Weatherspoon. ACM Symposium on Cloud Computing (SOCC). June 2010, Indianapolis, IN.

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