MFSYS35 datasheet(35/52 Pages) INTEL

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Intel® Modular Server System MFSYS25/MFSYS35 TPS

System Details

3.7.3

Storage Controller Module View

Figure 22. Front View of Storage Controller Module

3.7.4

Architectural Overview

3.7.4.1

Storage Controller Module Interface

The Interposer SAS signals from the storage controller module (SCM) originate from the LSI*

1068 and PM8399* devices.

A hardware reset line for each expander originates from each SCM. One SAS expander on the

Interposer is managed by one SCM; the second expander is managed by the second SCM (if

installed).

An I²C bus connects the SCM(s) to the Interposer VPD SEEPROM and each expander. The

SCM(s) can retrieve hardware monitor and drive backplane IDROM information from the

expanders, which are connected via I²C to these devices.

Disk drive status is communicated via SES pages to the expanders from the RAID stack in the

SCM, and this status is exported to GPIO LED signals, one for each disk drive. One overall

RAID status LED is also sent via SES and exported to a single LED.

Expander firmware can be downloaded from the SCM.

3.7.4.2

Interposer Card Functionality

SAS expander-1 provides connectivity to all disk drive “A” ports; SAS expander-2 provides

connectivity to all disk drive “B” ports. “A” port SAS traffic originates only from SCM-1, and “B”

port SAS traffic originates only from SCM-2. The SAS connection from SCM-1 to expander-2

(and SCM-2 to expander-1) is intended for high-speed controller to controller traffic only (write

cache mirroring).

Revision 1.3

Intel order number E15155-005

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