LSI 25083 manual Flexibility Features, Drive Roaming

•Provides one LED signal for each PHY to indicate link activity (this is a fault LED only for controllers with internal port connectors)

Note: The SAS 9280-8e RAID controller and the SAS 9280DE-8e RAID controller do not have any LEDs to indicate link activity.

•Provides an I2C interface for enclosure management

•Supports the internal SAS Sideband signal SFF-8485 (SGPIO) interface

1.6.6Flexibility Features

These features increase the flexibility of the RAID controllers:

•Supports a Flash ROM interface, a nonvolatile static RAM (NVSRAM) interface, and a pipelined synchronous burst SRAM (PSBRAM) interface

•Offers a flexible programming interface to tune I/O performance

•Allows mixed connections to SAS targets or SATA II targets

•Leverages compatible connectors for SAS connections and SATA II connections

•Allows grouping of up to four PHYs in a single quad port to form a wide port

•Allows programming of the World Wide Name

1.6.7Drive Roaming

Drive roaming occurs when the drives are changed to different ports on the same controller. When the drives are placed on different channels, the controller detects the RAID configuration from the configuration data on the drives.

Configuration data is saved in both the NVRAM on the RAID controller and on the drives attached to the controller. This action maintains the integrity of the data on each drive, even if the drives have changed their physical device ID.

Note: If you move a drive that is being rebuilt, the rebuild operation will restart, not resume.

1-14Overview

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