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Disk Cost Busters

This presentation discusses the challenges of high-cost storage area networks (SAN) compared to direct-attached storage (DAS) and explores new, lower-cost disk interface technologies such as Serial Advanced Technology Attachment (SATA) and Serial Attached SCSI (SAS). It provides an overview of these technologies, vendor round-up, and concludes with potential use cases for leveraging low-cost disk solutions.

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Disk Cost Busters

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  1. Disk Cost Busters “How to Leverage Low Cost Disk Solutions” Ron Lovell, Practice Director, Storage Greenwich Technology Partners

  2. Agenda • Challenges • Technology Overview • Vendor Round-up • Conclusions • Audience Response

  3. Challenges • The cost of SAN remains high compared to DAS • As the majority of data still resides on DAS, the cost differential creates a barrier to the adoption of shared storage model for many applications

  4. Challenges • New regulatory requirements such as Sarbanes-Oxley • Accelerating growth of fixed content type data

  5. Business Non- Critical Business Critical Mission Critical

  6. Solution • Leverage the benefits of networked storage • Leverage lower cost storage technology at price the business can rationalize

  7. Technology Overview A Look at New Disk Interface Technologies

  8. Technology Overview • New, lower cost interface technologies • Serial Advanced Technology Attachment (SATA) • Serial Attached SCSI (SAS)

  9. Technology Overview • Serial Advanced Technology Attachment (SATA) • Creates a point-to-point connection between the Serial ATA host bus adapter and the Serial ATA device (hard disk drive, etc). • Where transfer rates top out at 133Mb/sec for parallel ATA (UltraATA), transfer rates begin at 150 MB/sec for SATA • The maximum data cable (4 conductor) cable length is 1 meter

  10. Technology Overview • SATA • MTBF is 500-600K hours • 50 hr/week Duty Cycle • SATA II is designed support hot-swapping of drives, enabling feature-rich RAID protected storage enclosures to be developed • SATA II Port Selector enhancement released on 8/28/03 allows for two (redundant) paths to a storage device

  11. Technology Overview • Serial Attached SCSI (SAS) • Improvement over parallel SCSI • Data rate increases from 320MB/sec up to 1200MB/second • Full duplex, dual ported drives, 2.5 form factor • Multiples drives addressed from a single controller port

  12. Technology Overview • SAS • Mix SATA and SAS drives on the same controller • 10 Meter cable length • Standard for interface specification completed in May • Products expected to begin shipping next year

  13. SATA/SAS Quick Comparison

  14. Technology Overview Summary • Serial Attach technology overcomes the data bus speed limitations of Parallel • Serial ATA drives are ATA drives with a serial interface and ~10% higher price • Serial SCSI products won’t be available until 2004

  15. Technology Overview Summary • Leverages large format, low cost drives • OS compatible • 4096 devices addressable with expanders • SATA drives interoperate with SAS

  16. Vendor Roundup What’s Happening Out There

  17. Vendor Roundup • EMC • Clariion supports Parallel ATA • Centera (Content Addressable Storage) uses ATA • HP • SATA drive support available • SAS is in progress • HP, Adaptec, and Seagate working on a combined SAS/SATA solution

  18. Vendor Roundup • IBM • 80 and 160Gb SATA Drives • SATA interfaces on system boards • HDS • No current array support • No current plans to integrate SATA into existing array products • Plans to integrate SAS as demand ramps

  19. Vendor Roundup • XIOTECH • SATA and SAS on Magnitude 3D Roadmap • Dynamic Network Factory • SCSI to SATA Raid-capable arrays from .5T to 4T and 512Mb cache max

  20. Vendor Roundup • Dot Hill • No current support • Products possible early next year • Look for announcements later this Fall • NetApp • NearStore product line leverages ATA disk

  21. Vendor Roundup • StorageTek • BladeStore – 12T to 150T • Maxtor MaXLine ATA Technology • InoStor (Tanberg Data) • ValuNAS 9000 supports up 2.25T on SATA with multiple raid levels

  22. Vendor Roundup • LSI Logic • SATA RAID Controller • Working with HDS on SAS offering • Fujitsu • Serial ATA drives available

  23. Vendor Roundup • Maxtor • SATA drives available • Demo of SAS with LSI Logic • Seagate • SATA drives available • Working with HP and Adaptec on SAS/SATA solution

  24. Vendor Roundup Summary • Most vendors have roadmaps for both SATA and SAS but, market demand is still in question • Partnerships are being created to speed product creation • Vendors are creating stand-alone solutions as well as some integration with existing products

  25. Conclusions What Does This All Mean?

  26. How is SATA being used? • Low cost primary storage arrays for appropriate applications • Backup and recovery acceleration • Content Addressable Storage

  27. Possible Uses for the Technology • SATA • Fixed content such as multimedia data • Virtual tape device (two stage backup) • Facilitating data migrations • Supporting applications with low end data criticality and performance requirements

  28. Possible Uses for the Technology • SATA • Supporting applications with large temporary file requirements • More cost-effective data replication target in remote locations • Floating mirrors in larger storage arrays

  29. Possible Uses for the Technology • SAS (Future) • Supporting applications with mid-level data criticality and performance requirements • Supporting some lower cost configurations that traditionally would have called for FC • Medium-term archiving

  30. Things To Watch Out For • New-ness and robustness of the technology • Standards development • Reliability of ATA vs SCSI drives • Solutions where SATA/SAS are integrated into existing array technology

  31. Where is the disk market going? • Expanded and increased pressure for lower cost solutions and comprehensive management tool support • Serial Attach represents a powerfully disruptive force • Mid-tier storage prices are getting pretty low!

  32. Where is the Disk Market Going? • SATA and SAS will be integrated into existing vendor solutions and will generate new products and vendors • Adoption will likely be quicker than FC • If the price points are right, SAS may completely overshadow SATA

  33. Hosted by Audience Response • Will SAS eventually replace FC? • Will SAS or SATA become dominant? • Are you implementing RAID SATA solutions? • Is now a good time to buy mid-tier storage?

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