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Summary
For seamless integration and flexibility of drive use, LSI leverages LSISS2520 AAMUX® and SAS-to-SATA bridging technology in the DNS-9252 interposer card which integrates a SAS-SATA drive bridge enabling customers to build economical enterprise storage systems. These systems can accommodate lowcost, high capacity Serial ATA (SATA) hard drives without sacrificing reliability, manageability, or data availability.
LSI SAS bridge technology enhances SATA drives with essential enterpriseclass features on par with Serial Attached SCSI (SAS) or Fibre Channel disk drives. LSI AAMUX® technology enables single-ported SATA drives to connect like native dual-ported drives for use in enterprise storage systems using SAS expanders. The LSISS2520 device is based on 5th generation technology bringing true active-active multiplexing to the SATA drive, with both ports simultaneously available, much like dual-ported FC and SAS drives. A dual-ported activeactive SATA drive solution results in much higher performance and reduced system development costs when compared to previous system implementations. Because software failover is no longer required, this approach greatly simplifies system software complexity and manageability.
The SATA protocol is very limited in drive manageability features compared to SAS and Fibre Channel. The LSISS9252 interposer card supports full SAS SSP protocol to the host, thereby removing SATA commands and signaling from the SAS domain. This eliminates the SATA affiliation issues associated with the multi-initiator configurations that are critical to enterprise deployments. The LSISS9252 offers a number of new management features to SATA drives to further enhance their operation in SAS systems. These features include drive power control, PHY control, and extensive diagnostics. These management features can be accessed in-band, eliminating any complex Fibre Channel routing and programming.
Designed for 2.5” and 3.5” hard disk drives, the LSISS9252 interposer card is a complete turnkey solution for interconnecting SATA drives into enterprise storage solutions. The interposer consists of the LSISS2520 AAMUX® bridge device,
a dual SAS host interface, a SATA device interface, and the necessary support.
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Features
- Supports full speed SAS-2 and SATA 2.6 bridging functionality
- Eliminates SATA affiliation issues
- Drive Power and Spinup control
- SAS bridge architecture with activeactive route aware SAS switching between both host ports
- Active-active multiplexing providing true dual-ported functionality for single-ported SATA drives
- Two, fully independent 6, 3 and 1.5Gb/s SAS ports with speednegotiation and signal retiming/
reconditioning
- One 6, 3, and 1.5Gb/s SATA port with speed negotiation and signal retiming/reconditioning
- Compliant with SAS-2, SATA 2.6, and SAT-2 industry specifications
- Supports T10 Protection Information Model (DIF) and Sector Skewing
- Supports non-512-byte sector-size block accesses (performs sector skewing with 512-byte sector- sized SATA HDD)
- Supports multiple SAS initiators
- Supports up to 64 queued commands
- In-band configuration and control with finely adjustable PHY signal tuning
- 6Gb/s store and forward architecture eliminates SATA delays on SAS links
- Optimized design with optimized signal integrity
- Customizable drive sled mounting hole areas
- Extensive configurable diagnostics counters
LSISS9252kit: Interposer Kit for LSI 620J/DNS-1620
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