AIC/XTORE SAS OVERVIEW May, 2006 Dale Tsai DTSAI@AICIPC.COM Jack Fan JFAN@AICIPC.COM

What is SAS SAS – Serial Attached SCSI, A natural transition from parallel SCSI to serial

Why Serialize? Signal skew and crosstalk Signal termination restrictions Cable and connector reflections Device addressability

Serial Technologies SAS : 1st gen. 3Gbps

SAS Features/Benefits Performance 3.0Gbps(300MB/s)per single SAS port Port Aggregation, eg. Combine 4 ports to a single 12Gbps WIDE PORT (x4 port) Full Duplex (24 Gbps) Multiple Initiators and Targets (with Expander) Advanced Command Queuing Advanced Command queue: just like SCSI supports up to 256 queue levels.

SAS Features/Benefits Flexibility Coexist of SAS and SATA Drives SCSI software/middleware can be used Scalability Up to 16,256 SAS/SATA devices (in one SAS Domain) Expander is able to connect 128 devices Reliability Dual Port and Multi-initiator for Fault Tolerance Hot-swap connector High MTBF Drive Using SATA: cost-effective bulk storage, to be applied where transaction rates are low and data availability is not critical. Using SAS: are built for high-performance, high-availability use. Eliminating new training or integration costs and the need for modifications to legacy software A Fan out Expander is able connect to 128 devices, including initiators, fan out expanders, edge expanders, and SAS/SATA drives.

Interface Comparison ATA SATA SCSI SAS FC Interface Parallel Serial Addressing 2 1, or 16 with SATA II 16 128 16 million Connection 80-pin 7-pin 68-pin Internal/ external Copper/optical intemal/external Dual-port No Yes Topology Bus Point-to-point Point-to-point w/expanders Loop, fabric Duplex Half Full Max.devices 1, or 15 with port multiplier 16,256 With expanders 127-loop 16.7 million fabric Cable length 0.4m 1m 12m 10m 30m (copper) 300m (optical) Applications Internal Storage ATA RAID, server,and high-end work-station storage Midrangeand enterprise servers SAN and enterprise servers

Advantage of SAS Interface High Speed Serial SCSI instead of Parallel Point-to-Point Connection Expander for Scalability Dual Port Connectivity SATA Compatible Dual 7-pin Interface Port Aggregation e.g. x4 WIDE PORT

Point-to-Point Connection Server . . Up to 8 HBA (8 ports) One by one single port connection Usually for HDD inside server enclosure Either SAS or SATA drive can be used

Expander for Scalability HBA (8 ports) Server HBA (8 ports) 4 4 4 Port Aggregation X4 Wide port Dual ports connected JBOD 1 Use SAS drive for dual, SATA only for single 36 Ports Expander . . Up to 24 36 Ports Expander 4 12Gbps 4 Usually used for external connection (JBOD), but also for internal, sometimes

Dual Port Connectivity

Dual Port SAS/SATA Design B A C K P L N E SAS HBA Port x 1 SAS connector SAS HDD SAS HBA Port x 1 B A C K P L N E SAS HBA Port x 1 1:2 MUX SATA I/II HDD would need to use an Active-Active port selector (multiplexer/MUX) to support dual functions in a SAS enclosure. SAS connector SATA HDD SAS HBA Port x 1 SATA connector Vitesse 7170 PMC xxx Siliconstor SS1300

Failover via Dual Port cross over Further Expansion Further Expansion

Expander Chips PMC Sierra Vitesse LSI Logic 12-port, P# LSISASx12 12-port, P# PM8383-BI 24-port, P# PM8387-BI 36-port, P# PM8388-BI Vitesse 12-port, P# VSC7160 24-port, P# VSC7153 36-port, P# VSC7154

SAS HBA Chip Vendors: LSI Logic, Adaptec 4 or 8 ports are available PCI-X (64b x 133) or PCI-E(2.5Gb x n) Most HBAs now still use PCI-X (~1GB/s)

Xtore SAS JBOD with HBA

Xtore SAS DAS/JBOD Solutions 3U 16 Drives SAS JBOD External cable 1U 10 Drives SAS JBOD Solution1 Elements: Servers SAS RAID HBA Xtore 1U 10 drivers or 3U 16 Drivers SAS/SATA JBOD

High-Performance SAS Server Clusters Xtore SAS JBOD Series Solution3 Elements: Servers with support for multi-path I/O (MPIO) support if path failover is required on the same server Cluster Software -single or dual SAS controllers and cluster software per node in the Cluster SAS RAID HBAs Xtore SAS/SATA JBOD series

XJ-SA24-316R XJ-SA26-224R XJ-SA26-212R XJ-SA26-110R SJ-1100 SAS JBOD Series XJ-SA24-316R XJ-SA26-224R XJ-SA26-212R XJ-SA26-110R

Connection for 16 Drives SAS JBOD 3U 16-channel for 16 x 3.5” SAS-SAS/SATA JBOD w/dual-port and daisy-chain support 8-channel SAS controller A or HBA Card 8-channel SAS controller B or HBA Card Redundant PS 4 x A1 4 x B1 SAS 4X A1 SAS 4X Expansion A 24X exp 16 x 16 x 24X exp IO Board A SAS 4X B1 SAS 4X Expansion B 4 x Expansion B IO Board B IOBoard 4 x Expansion A To Daisy-Chain JBOD enclosure (level 2 to level n)

Cont’d Support 3.5” SAS/SATA HDD Dual JBOD Controller SES Compatible Redundant Power Supply Dual 4x Host or Single 4x Host + 4x Expansion port HDD Status LEDs Hardware Fault Alarm Windows In-band Firmware Upgrade & Serial Monitoring Console SES: SCSI Enclosure Services Dim: 440x546x132.5(mm)

XJ-SA24-316R 3U chassis _ 16bays 3.5’’HDD

Connection for 2U 2.5”x24 SAS JBOD 2U 24-channel for 2.5” SFF SAS-SAS/SATA JBOD w/dual-port and daisy-chain support 8-channel SAS controller A or HBA Card 8-channel SAS controller B or HBA Card Redundant PS 4 x A1 4 x A2 4 x B1 4 x B2 SAS 4X A1 SAS 4X A2 IO Board A SAS 4X Expansion A 24 x 24 x SAS 4X B1 36 X exp 36 X exp IOBoard IO Board B SAS 4X B2 SAS 4X Expansion B 4X Expansion A 4X Expansion B To Daisy-Chain JBOD enclosure (level2 to level n)

Cont’d Support 2.5” SAS/SATA HDD Dual JBOD Controller SES Compatible Redundant Power Supply Dual 4x Host & 4x Expansion port HDD Status LEDs Hardware Fault Alarm Windows In-band Firmware Upgrade & Serial Monitoring Console Dim: 440x495x88(mm)

Connection for 1U 2.5” x 10 SAS JBOD 1U 10-channel for 10 x 2.5” SFF SAS-SAS/SATA JBOD w/dual-port and daisy-chain support SAS controller A or HBA Card A SAS controller B or HBA Card B Redundant PS 4 X A2 4 x B1 4 x B2 SAS 4X A1 4 x A1 SAS 4X A2 IO Board A SAS 4X Expansion A 24 X exp 24 X exp SAS 4X B1 10 x 10 x IOBoard SAS 4X B2 IO Board B SAS 4X Expansion B 4X Expansion A 4X Expansion B To Daisy-Chain JBOD enclosure (level 2 to level n)

Cont’d Support 2.5” SAS/SATA HDD Dual JBOD Controller SES Compatible Redundant Power Supply Dual 4x Host & 4x Expansion port HDD Status LEDs Windows In-band Firmware Upgrade Dim: 440x433.5x44(mm)

XJ-SA26-110R IU chassis_10 bays 2.5’’HDD

Xtore SAS JBOD XJ-SA26-110R XJ-SA26-224R XJ-SA26-212R XJ-SA24-316R Form factor 1U 10-bay 2U 24-bay 2U 12-bay 3U 16-bay Expander VSC7153 24-port 　VSC7154 36-port 　VSC7153 Uplink (Host interface) per IO module Dual mini SAS, 4x Dual mini SAS Single mini SAS Downlink (Expansion interface) per IO module (or used as Host) SAS addresses # 26 38 Route table entries 320 Expansion enclosures # 12 22 17 Vitesse advantages Integrated Enclosure Management controller Integrated SSP Initiator and target capability All Phys self configuring operation at 1.5 and 3.0 Gb/s Automatic speed detection/negotiation Larger table routing capability (320 entries) The most efficient table routing implementation Other implementations will waste entries for unused expander PHYs Up to 60 general purpose IO, reduces external components

Single JBOD Configuration Server with SAS HBA or SAS RAID card SFF8470 SFF8088 (infiniband) miniSAS 26-pin For host for JBOD

JBOD Cascading Configuration Server with SAS HBA or SAS RAID card

Fault Tolerance with JBOD Cascading Server with SAS HBA or SAS RAID card Server with SAS HBA or SAS RAID card

Q & A