System Architecture Overview; System Level Block Diagram - HGST Ultrastar Data102 User Manual

User Guide
• Controlled by two (2) redundant I/O Modules
• Powered by two (2) redundant 1600W PSUs
• Full high availability with independent dual paths to all HDDs
• Toolless replacement of all Customer Replaceable Units (CRUs)
• Fits within a standard EIA-310 rack including all necessary cable management (see:
Compatible Rack Hardware Configuration
• Supports up to 3m passive SAS cables (limited to 3m or less) or active cables (any length)
• Supports High line (220-240 VAC) Input Power
1.2 System Architecture Overview
The Ultrastar Data102 IOM uses a cascaded expander design to allow for connection to all 102
drives. A 48-port primary expander connects with the six host ports, has a x3 link to the other IOM
for IOM-IOM communication and syncing, and also has a x10 SAS link to each secondary expander.
Each secondary expander then connects with fifty-one (51) drives.
The out-of-band management microprocessor provides an Ethernet connection using a Redfish/
RESTful API to access the various enclosure services. All the SES enclosure information can
be obtained through the out-of-band management port. Major use cases for this feature include
obtaining storage subsystem health information, locating enclosure components using the IDENT
LEDs, and updating firmware.
The system FPGAs control and report the states of the system fans, enclosure LEDs, connector
LEDs, drive LEDs, and T10 drive power disable signals on the 102 data storage drives.
Note: To use T10 power disable, the drives installed must also support this feature.
2
The I C architecture is designed to support only one single master on any given bus. The primary
expander will be the master on each I
Data102 enclosure. The number of devices on each bus are balanced to allow communication to
peripheral devices and not overload any one bus. The devices connected on the I
the enclosure VPDs, temp sensors, baseboard FPGAs, and SAS connectors among others.
1.3 System Level Block Diagram
The following image shows the system block diagram for the Ultrastar Data102. .
* SATA based models will only include 1 IOM
*
(page 12))
2
C bus. There are eight I
2

1.2 System Architecture Overview

2
C buses used in the Ultrastar
2
C buses include
1. Overview