Information Lifecycle Management – Presented By MCSI Technology Trends ATA Disk

Information Lifecycle Management – Presented By MCSI Agenda ATA Disk –Overview –Parallel vs Serial –Phases of Serial ATA –SCSI vs SATA –Uses

Information Lifecycle Management – Presented By MCSI 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

Information Lifecycle Management – Presented By MCSI Parallel ATA vs Serial ATA ComparisonPATASATASATA Advantage Transfer Rate3MBs – 133MBs150MBs – 600MBs 6x Performance enhances productivity Voltage5 Volt250mVLess Power, less heat, good for mobile use Cable & Connector 18in, 80- conductor, 40- pin flat ribbon <1m, thin & flexible 4 signal pins Easier cable routing, improved ventilation, higher reliability (skew), greater scalability Hot PlugNo standard defined Supported w/defined standard Increased up-time & availability (in a way, better than FC b/c of loop insert issues) ConnectivityShared (Master/Slave) Point-to-PointEliminates confusion, improved performance Computer Technology Review, July 2003, Pg36

Information Lifecycle Management – Presented By MCSI 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

Information Lifecycle Management – Presented By MCSI 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

Information Lifecycle Management – Presented By MCSI SCSI vs ATA Performance & Reliability Criteria Comparison ATASCSISCSI/ATA RPM7,20015,000208% TestCache on Drive (MB)88100% HDTachSequential Read (avg MB/s) % HDTachSequential Write (avg MB/s) % HDTachRandom Access Time (ms) % IOMeterDesktop IOPS % IOMeterDesktop avg response time (ms) % IOMeterWeb Server IOPS % IOMeterWeb Server avg response time (ms) % MTBF (thousands of hours) % Duty cycle (hours per day)824300% Storage Magazine, October 2003, Pg 22

Information Lifecycle Management – Presented By MCSI SCSI vs ATA Performance & 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’ brethren however, the line blurrs…. Western Digital Raptor SATA Disk –36GB, 10K rpm, 5.2ms Seek –1.2 million hour MTBF –30% cheaper than SCSI disk

Information Lifecycle Management – Presented By MCSI SCSI vs ATA Performance & 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.

Information Lifecycle Management – Presented By MCSI 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)

Information Lifecycle Management – Presented By MCSI 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”

Information Lifecycle Management – Presented By MCSI 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

Information Lifecycle Management – Presented By MCSI ATA Resources