You can use the controllers in three scenarios:
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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.
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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.
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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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