LSI Logic Serial Attached SCSI SAS SATA Overview
- Slides: 30
® LSI Logic Serial Attached SCSI (SAS) & SATA Overview
The Emergence of Serial Attached SCSI (SAS) n Newest Storage Interface for Direct Attach Storage (DAS) n SAS Improves & Builds on Parallel SCSI Foundation Supported by ANSI T 10 Standards Committee (Same as SCSI) u Successor to Ultra 320 SCSI on Industry Roadmap u n Significant Performance & Feature Set Enhancements LSI Logic Confidential © LSI Logic 2003 Source: SCSI Trade Association Jan 2004 2
SATA vs SATA 300 Feature Comparison Feature List SATA First Party DMA Native Command Queuing Identify device/set feature Defect management Enclosure management Staggered Spin up Hot Plug/Presence Detect Port Multiplier 1. 0 2 nd Phy spec 3 Gb/s LSI Logic Confidential © LSI Logic 2003 SATA 300 3
LSI Logic Storage Controllers PCI RAID 2004 1 H’ 05 2006 HBA 3. 0 Gb/s • FC 2 Gb/s LSI Logic Confidential © LSI Logic 2003 • FC 4 Gb/s 4
SAS is Compatible with SATA! n Feature: SAS controllers can talk to SATA or SAS HD Drives SAS HDD - Used When Performance & Reliability are Critical u SATA HDD - Used When Capacity & Cost Are Most Important u SAS & SATA HDD - Can be Mixed in Single System u n Benefit: Server & Workstation Platforms Can be Standardized to Reduce Component Qualification & Inventory LSI Logic Confidential © LSI Logic 2003 5
SAS & SATA are Interoperable SAS and SATA HDD connectors SATA backplane connectors will NOT accept SAS HDDs SAS backplane connectors accept both SAS target and SATA HDDs • No Notch Dual Ported LSI Logic Confidential © LSI Logic 2003 6
New Terms n SATA Architected, SATA Populated (SATA) u A system that contains SATA Controllers, SATA HDD, and optionally SATA Multipliers u Low cost, GREAT for certain markets (i. e. streaming, archive) n SAS Architected, SAS Populated (SAS) u A system that contains SAS controllers, SAS HDD, and optionally SAS expanders u X 3 cost on HDD, top notch performance for IOP intensive applications n SAS Architected, SATA Populated (SAS/SATA) u A system that contains SAS controllers, SATA HDD, and optionally SAS expanders u This allows the creation of sophisticated topologies with low cost SATA HDD LSI Logic Confidential © LSI Logic 2003 7
The Power of Serial Interfaces SATA 300 Feature: Small Connector Enables Small Form Factor HDDs Benefit: More storage per cubic inch Feature: Small Cable vs SCSI or ATA Benefit: Simpler cabling, better cooling Feature: 3 Gb/s (300 MB/s) ITransfer Rate Increasing to 12 Gb/s (1. 2 GB/s) in Successive Generations Benefit: Unprecedented performance and roadmap Feature: Point to Point Connection with Dedicated Bandwidth Benefit: Simplified cabling, NO signal LSI Logic Confidential © LSI Logic 2003 SAS w/SAT A HDD SAS 8
SAS - SCSI on Steroids!! SATA Feature: Full Duplex Data Transfer Benefit: FC-like Simultaneous Upstream & Downstream Data Flow Effectively Doubling Performance Feature: Each HDD is Assigned a Unique World Wide Name (WWN), Similar to FC Benefit: FC-Like SAN capabilities Feature: Dual Ported Benefit: FC-Like Redudancy Feature: SCSI Tagged Command Queuing (256 Levels) Benefit: Old fashioned SCSI Logic Confidential © LSI Logic 2003 SAS w/SAT A HDD SAS 9
SAS & SATA - The New Paradigm SATA 300 Feature: SAS Supports up to 16, 256 Devices in a Domain (128 is more practical) Benefit: Sophisticated topologies including JBOD (SATA II = 15 Devices/ port) Feature: SAS Cabling Distances of 8 m Point to Point (vs. 1 m for SATA) Benefit: Enables Box to Box connectivity within a Rack Feature: SAS Expanders (vs SATA Multipliers) Benefit: Allows Tremendous Flexibility in Application Configuration(i. e. JBOD and JBOD Cascading) LSI Logic Confidential © LSI Logic 2003 SAS w/SATA HDD SAS 10
Technology Comparison SATA 300 Significant Differences Half-duplex Capabilities Exist Full-duplex with Link Aggregation Performance Full Duplex 3. 0 Gb/s Introduction 6. 0 Gb/s in 2006 2. 0 Gb/s 4 Gb/s in 2004 1 m internal cable > 8 m internal and external cables 15 m external cable (Copper) Multipliers Expanders 15 HDD max >128 devices 127 devices FC-AL 16 Million Fabric Single-port HDDs Dual-port HDDs Single-host Multi-initiator Software transparent with Parallel ATA Software transparent with Parallel SCSI Connectivity Availability Driver Model SAS adds FC Fibre Channel LSI Logic Confidential © LSI Logic 2003 11
SAS Expanders & Wide Ports Are Key!! n SAS Wide Ports are Unique in Storage u No SCSI, SATA, or FC equivalent n A wide port is defined as more than one physical link in a port u Wide ports are used to aggregate bandwidth u A wide port is a set of 1 -4+ physical links between two devices. Different connections may be open on different links. u Typical usage: HBA/RAID controller wide port connected to expander wide port n All physical links in wide port use the same SAS address u Wide ports are transparent to the host/OS u Command sent down one link; data may be returned on another link (separate connection). No SW is required, all link arbitration is handled by HW. SCSI Expert? ? LSI Logic Confidential © LSI Logic 2003 12
The Real Power of Wide Ports SATA Multiplier • Good for Streaming • Poor at IOPs SATA Controller • Streaming = Large Block Sequential LSI Logic Confidential © LSI Logic 2003 SAS Expander • Good for Streaming • Good for IOPs SAS Controller • SAS Expander • X 1, x 2, x 3, x 4 Host Connection • ASx 12 is 1 x 11, 2 x 10, 4 x 8 • ASx 28 and ASx 36 coming 13
SATA Multiplier vs SAS Expander SAS HDD SATA HDD 1 1 2 3 4 5 • SATA Multiplier • Single Host Connection • Different chips for different HDD Counts • Vitesse 1 x 15 • Silicon Image 1 x 5 SATA Controller 2 SATA HDD = 3 • SAS Expander • X 1, x 2, x 3, x 4 Host Connection • ASx 12 is 1 x 11, 2 x 10, 4 x 8 • ASx 28 and ASx 36 coming • LSI Logic, PMC Sierra, Vitesse SAS Controller • Note: ALL SATA FUNCTIONALITY IS CONTAINED WITHIN SAS • Except: SAS cannot talk to SATA multipliers LSI Logic Confidential © LSI Logic 2003 14
Typical Configurations Sample Configurations-Better than SCSI ^Clustered Solution < Cascaded JBODs LSI Logic Confidential © LSI Logic 2003 15
LSI LOGIC SAS Ecosystem LSISAS 1064 First Article Production Controller Hardware LSISAS 1068 Expanders LSISASx 12 Vendor A Vendor B Hard Drives Vendor C Vendor D Cables + Connectors SAS x 1 SAS x 4 Boards HBAs RAID Controllers Protocol Analyzers Validation Equipment Bus Exercisers Jitter/Phy Analysis Standards & Initiatives SAS v 1. 0 Spec STA Plug-Fest Letter Ballot Q 4 Q 1 INCITS Approved Q 2 Q 3 2003 LSILogic Confidential – Internal Use Only Logic 2003 LSI Confidential © LSI Q 4 Q 1 Q 3 Q 2 2004 Q 1 Q 3 Q 2 Q 4 2005 3/10/2004 16
It’s REAL!! LSI Logic Confidential © LSI Logic 2003 Learn About System Bandwidth 17
® The SAS Infrastructure
External 4 X Connector LSI Logic Confidential © LSI Logic 2003 19
SAS / SATA Multi-Lane Internal & SAS Multi-Lane External (Drawing courtesy of Molex) LSI Logic Confidential © LSI Logic 2003 20
SAS Multi-Lane Connections (Drawing courtesy of Molex) LSI Logic Confidential © LSI Logic 2003 21
New Connectors have been defined: SFF 8087 Internal SAS Connector LSI Logic Confidential © LSI Logic 2003 22
SFF 8088 External SAS Connector LSI Logic Confidential © LSI Logic 2003 23
SFF 8088 External SAS Connector LSI Logic Confidential © LSI Logic 2003 24
Pieces of the puzzle n Cables u n Technical Cable Concepts, Inc. 350 Lear Avenue, Costa Mesa, CA 92626 Casey Dugan (714) 835 -1081 x 135 (caseyd@techcable. com) www. techcable. com Chassis u AIC LSI Logic Confidential © LSI Logic 2003 25
® Backup
SCS - What If? ? I • SCSI HDDs ( 1 -15 HDD) LSI Logic Confidential © LSI Logic 2003 27
Calculating System Bandwidth 4 SAS @ 300 MB/s 1200 MB/s ~ 480 MB/s OR ~1000+ IOPS Large Block Sequential HDD ~ 60 MB/s 8 HDD = 480 MB/s Small Block Random PCIX 64 b, 133 MHz ~1000 MB/s 8 SAS @ 300 MB/s PCIe ~ 250 MB/lane 2400 MB/s X 4, X 8, X 16 common LSI Logic Confidential © LSI Logic 2003 HDD ~ 120 IOPs &HDD Cache 8 HDD ~ >1000 IOPs 28
SAS Protocols n SSP - Serial SCSI Protocol u Used whenever SAS HDD talks to SAS Controller (with or without SAS Expanders) n SATA u Always used to communicate with a SATA HDD n STP - SATA Tunneled Protocol u Used when SATA HDD is connected to SAS controller via SAS expander u STP is used between SAS controller and SAS expander; SATA is used to talk to the SATA HDD u STP EMB (Enclosure Management Bridge), Allows a SAS controller to talk to the I 2 C interface embedded in the x 12 Expander. Typically the I 2 C interface is connected to an external Enclosure Management Processor n SMP - Serial Management Protocol u Allows SAS controllers to configure SAS expanders LSI Logic Confidential © LSI Logic 2003 29
Serial Protocols LSI 106 SSP LSIx 12 8 STP SMP LSIx 12 SSP SAS HDD SATA SAS HDD LSI Logic Confidential © LSI Logic 2003 SATA HDD or SMP EMB I 2 C bus SATA HDD Enc. Proc. 30
- Serial scsi vs sas
- Msi circuit
- What is soap opera
- Pipo truth table
- I scsi
- Puerto atx btx
- Bauernschmaus
- Motivationbrief
- James russell odom and james clayton lawson
- I scsi
- Scsi unit fbi
- Logic based testing
- Onboard sata controller
- Marko marulić molitva suprotiva turkom
- Test crtanja sata
- Tip nastavnog sata
- Buses de datos sata
- Sata meaning
- Incubus drive çeviri
- Molitva za pocetak sata
- Pio mode 4
- Menjanje sata
- Trajanje školskog sata
- Molitva za pocetak sata
- Ura ili sat
- Tuhat roomalaisin numeroin
- Etape nastavnog sata
- Sata transfer mode
- Gbs controller
- Primjer pripreme za nastavni sat matematike
- Dijelovi biljke cvjetnjače