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How to Know if Virtual Tape Technology is Right for You
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How to Know if Virtual Tape Technology is Right for You

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By: Chris Dedham, Business Continuity Specialist and Senior Storage Solutions Architect, Mainline Information Systems …

By: Chris Dedham, Business Continuity Specialist and Senior Storage Solutions Architect, Mainline Information Systems

A virtual tape library (VTL) is an archival storage technology that allows you to save data as if it were being stored on tape, even if you are using hard disk or another storage medium. Common benefits of virtual tape systems include storage efficiency, better backup and recovery times and lower operating costs.

This presentation will explore the options and benefits of VTL's, give you a basic understanding of what is available in the marketplace, and help you decide if this solution is right for your organization.

This presentation includes the following topics:

Review of backup topologies
Why customers are interested in VTL's
Facts about VTL's
What is intelligent compression (aka Data De-Duplication)
Various methods and approaches to Data De-duplication

To view this presentation with audio, visit: http://go.mainline.com/pages/start/knowledge-center-vtl-webcast-aug-2009/index.html?

For other topics, visit: www.mainline.com/kc

Published in: Technology, Business

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  • 1. How to Know if Virtual Tape Technology is Right for You Chris Dedham Business Continuity Specialist and Senior Storage Solutions Architect Mainline Information Systems
  • 2. Review of Backup Topologies - Backup directly to Tape Database Tape Tape Duplication for DR The disk storage contains the production data Host Data is backed up directly to tape Tape Disk
  • 3. Review of Backup Topologies - Backup directly to disk, then moved to tape [D2d2T] Database Tape Tape Duplication for DR The disk storage contains the production data Host Data is backed up directly to disk Tape Data is flushed from disk to tape Disk Disk
  • 4. Review of Backup Topologies - Backup directly to disk, and stored on disk [D2D2T] Database Tape Copy for DR and Archiving The disk storage contains the production data Host Data is backed up directly to disk and stored on disk Tape Disk Disk or VTL
  • 5. Review of Backup Topologies - Backup directly to VTL, and replicated to VTL Database The disk storage contains the production data Host Disk VTL VTL Data is backed up directly to Disk on a VTL, and stored on the VTL De-Duplicate the data and replicate it to another VTL over the WAN “ Truly Tape Less”
  • 6. Review of Backup Topologies - Backup directly to VTL, and replicated to VTL Database The disk storage contains the production data Host Disk VTL VTL Data is backed up directly to Disk on a VTL, and stored on the VTL De-Duplicate the data and replicate it to another VTL over the WAN “ Truly Tape Less” Tape for Archiving Tape
  • 7. Why are customers interested in VTL’s
    • A desire to get away from Real Tape
      • Tape drive and tape automation break - fix issues
      • Eliminate tape handling – Operational / Security
      • Doing something different than status quo
    • Increase backup throughput
      • More tape drives (aka mount points) for greater parallelism
      • LAN Free to disk
      • Helps with small files and NDMP
      • Less administrative overhead than large diskpools
  • 8. Why are customers interested in VTL’s (cont)
    • Faster restores
      • No tape mount load times (Disk seeks instead)
      • Tape volume fragmentation is greatly reduced
    • Increase TSM admin throughput processing
      • Reduced disk pool migrations
      • Faster DR copies to real tape
      • Faster reclamation processing
      • Additional drives (aka mount points)
  • 9. Why are customers interested in VTL’s (cont)
    • Replication for Disaster Recovery
      • Tape handling is costly operationaly and can create security issues
      • Data De-Duplication can greatly reduce the amount of data that must be transferred over the WAN
    WAN costs can be 50% to 70% TCO of a DR solution
    • Data De-Duplication can reduce the cost of disk
      • Making 30TB’s of disk look like 300TB’s
  • 10. Some facts about VTL’s , however
    • Real tape can be faster than virtual tape
      • High speed tape can be faster than virtual tape depending on the workload
      • Real tape can store data at a lower cost per GB
      • Storing inactive data on real tape can have better environmental characteristics
    • Virtual tape may require “straight disk” and real tape to handle all of the workload
  • 11. The special sauce in VTL’s is intelligent compression (aka Data De-Duplication)
    • All VTL’s can do standard LZ compression like in tape drives
      • LZ compression reduces space within files.
      • Typically 2:1 compression ratio
    • Some VTL’s have Data De-Duplication
      • Data De-Dupe eliminates redundant files
      • 7:1 or greater De-Duplication ratios can be obtained
      • “ Your mileage may vary”
  • 12. There are two methods for Data De-Duplication
    • In-Line Data De-Duplication
      • The incoming backup data is de-duped before it lands on the VTL storage.
      • The IBM TS7650g (Diligent) and Data Domain use this method
    • Post Processing Data De-Duplication
      • The incoming backup data is de-duped after it lands on the VTL storage
      • The FalconStor VTL and Sepaton VTL use this method
  • 13. Three Basic Approaches
    • Talked about today in the industry:
    • Hash based de-duplication
      • Sometimes referred to as a Content Addressable Storage approach
    • Content Aware
      • Assumes the best candidate to de-dupe against is an object with the same properties (name etc.)
    • HyperFactor
      • A different approach based on an agnostic view of data
  • 14. How Hash Data De-duplication (DDD) Works 1. Data chunks are evaluated to determine a unique signature for each 2. Signature values are compared to identify all duplicates 3. Duplicate data chunks are replaced with pointers to a single stored chunk, saving storage space C A B C A A B B A Data Store Data Store C A B C A A B B A Data Store C A b c a b B a a Data Store
  • 15. Identification of Redundant Chunks
    • Unique identifier is determined for each chunk
    • Identifiers are typically calculated using a hash function that outputs a digest based on the data in each chunk
      • MD5
      • SHA
    • For each chunk, the identifier is compared against an index of identifiers to determine whether that chunk is already in the data store
    • Selection of hash function involves tradeoffs between
      • Processing time to compute hash values
      • Index space required to store hash values
      • Risk of false matches
  • 16. Deduplication Ratios
    • Used to indicate compression achieved by deduplication
    • If deduplication reduces 500 TB of data to 100 TB, ratio is 5:1
    • Deduplication vendors claim ratios in the range 20:1 to 400:1
    • Ratios reflect design tradeoffs involving performance and compression
    • Actual compression ratios will be highly dependent on other variables
      • Data from each source: redundancy, change rate, retention
      • Number of data sources and redundancy of data among those sources
      • Backup methodology: incremental forever, full+incremental, full+differential
      • Whether data encryption occurs prior to deduplication
  • 17. And data deduplication is the key to using more disk more cost effectively!
  • 18. Thank you Knowledge is POWER at: Mainline’s Knowledge Center www.mainline.com/kc 866.490.MAIN (6246)

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