Configuration Scenarios

> Configuration Scenarios

> You can use the controllers in three scenarios:

> | Low-end, Internal SATA II and SATA III Configurations – These configurations are mostly for low-end or entry servers. Enclosure management is provided through an out‑of‑band I2C bus. Side bands of both types of internal SAS connectors support the SFF-8485 (SGPIO) interface.

> | Midrange Internal SAS Configurations – These configurations are like the internal SATA II and SATA III configurations, but with high-end disks. These configurations are more suitable for low-range to midrange servers.

> | High-end External SAS/SATA II Configurations – These configurations are for both internal connectivity and external connectivity, using SATA II drives, SAS drives, or both. External enclosure management is supported through in-band, SCSI-enclosed storage. The configuration must support STP and SMP.

> The following figure shows a direct-connect configuration. The I2C interface communicates with peripherals. The external memory bus provides a 32-bit memory bus, parity checking, and chip select signals for pipelined burst synchronous static random access memory (PBSRAM), nonvolatile static random access memory (NVSRAM), and Flash ROM.

> Figure 2. Example of an LSI SAS Direct-Connect Application

> NOTE The valid drive configuration combination also applies to hot spares.

DB15-000988-08-December 2013
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