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Technology Trends

Technology Trends. ATA Disk. Agenda. ATA Disk Overview Parallel vs Serial Phases of Serial ATA SCSI vs SATA Uses. ATA Disk Overview. Advanced Technology Attachment (ATA) Remember when ‘AT’ was the advance from ‘XT’? Used primarily in Desktop systems Millions produced and in use today

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Technology Trends

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  1. Technology Trends ATA Disk

  2. Agenda • ATA Disk • Overview • Parallel vs Serial • Phases of Serial ATA • SCSI vs SATA • Uses

  3. ATA Disk Overview • Advanced Technology Attachment (ATA) • Remember when ‘AT’ was the advance from ‘XT’? • Used primarily in Desktop systems • Millions produced and in use today • Parallel ATA (PATA) most prevalent • Also known as Ultra-ATA • w/in ‘enterprise’ market, made up between 5-10% in 2002 – predicted to double in 2003 • Serial ATA (SATA) clearly improved and will replace Parallel in the near future • Has a 10-year roadmap • Will challenge SCSI • Parallel continues thru 2005

  4. Parallel ATA vs Serial ATA Computer Technology Review, July 2003, Pg36

  5. The Serial ATA Types & Phases • SATA 1 • Shipping Today, 150MBs • SATA 2 Phase 1 • 150MBs • Support backplane connectivity, enclosure monitoring (heat, etc), command tag queuing • SATA 2 Phase 2 • 300MBs • Dual-porting for active-active controllers, Command Tag Queuing (CTQ) • Often referred to as SATA II – a misnomer

  6. The Serial ATA Types & Phases • Serial SCSI (SAS) • Has been around but there has been little need because of FC drives • SAS can share the same controller as SATA • Provides ability to accommodate different performance and reliability requirements into a common architecture

  7. SCSI vs ATAPerformance & Reliability Criteria Comparison Storage Magazine, October 2003, Pg 22

  8. SCSI vs ATAPerformance & Reliability Criteria Comparison • ‘Enterprise Class’ disks have • Better thermodynamics • Stiffer, lighter & more resilient actuators • Longer testing cycles • Deeper command tag queuing • than their ‘Desktop Class’ brethrenhowever, the line blurrs…. • Western Digital Raptor SATA Disk • 36GB, 10K rpm, 5.2ms Seek • 1.2 million hour MTBF • 30% cheaper than SCSI disk

  9. SCSI vs ATAPerformance & Reliability Criteria Comparison • With regard to reliability • What everyone is really after is not disk reliability but application availability (EMC mantra forever) • To achieve it using SATA, we have: • RAID, Hot-Swap-ability, Hot-Sparing, Redundant Components • With regard to performance • What percentage of your Servers have IOPS or throughput requirements approaching SCSI or FC capacities? • In most environments, this percentage is low and for the servers that need it, FC or SCSI is available • For the majority, SATA will meet application performance requirements.

  10. Uses for ATA Disk • Backup to Disk • Not an automatic fix for backup problems • Need to find the bottleneck first • If it is tape, then it can help right away • Helps if quick restore is the requirement • Approaches • Virtual Tape Libraries (VTL) • D2D • Integrated Disk/Tape subsystems (ADIC)

  11. Uses for ATA Disk • Information Lifecycle Management • Value of data changes over time • ATA-based subsystems provide a cost effective medium between high performance disk and tape • Departmental or low activity servers & applications • Target for HSM software • Target for ‘Reference Data’ • Everyone’s jumping on the ILM bandwagon • STK has Trademarked “ILM”

  12. Uses for ATA Disk • Disaster Recovery • Inexpensive Target for Data Replication to a remote site • Primary disk is high-performance, highly functional disk • Target disk is ATA Disk Subsystem • Use Host-Based replication Technologies • EMC RepliStor or NSI DoubleTake • Some ATA-Based arrays have array-array replication software built-in • EqualLogic PeerStorage

  13. ATA Resources • http://www.serialata.org • http://www.sata-io.org

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