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CH222 Compute Node V100R001 User Guide 18

This document describes the appearance, functions, structure, and installation, removal, and configuration methods of the CH222 compute node.
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Logical Architecture

Logical Architecture

This topic describes the relationships between the mainboard, hard disk backboard, and hard disk baseboard of the CH222.

Figure 2-11 shows the logical architecture of the CH222. The CH222 contains the mainboard, hard disk backboard, and hard disk baseboard.

  • The mainboard holds basic components such as CPUs and dual in-line memory modules (DIMMs) and provides the computing function.
  • The hard disk backboard, used with the CH222 mainboard, helps expand storage capacity and control hard disk in real time. The uplink is two Mini Serial Attached SCSI (SAS) connectors connecting to the two Mini SAS connectors of the RAID controller card on the mainboard; the downlink is 15 SAS connectors, each of which connects to a 2.5-inch Serial Attached SCSI (SAS) disks, Serial Advanced Technology Attachment (SATA) disks, or solid-state drives (SSDs).
  • The hard disk baseboard implements the power supply function and connects to the mainboard. The hard disk baseboard connects to the hard disk backboard by using the 12 V power connector and to the mainboard by using the Xcede connector. The signals include SGPIO, UART, JTAG, and I2C.

The SAS Expander chip on the hard disk backboard helps expand the ports of the RAID controller card on the mainboard from 8 SAS ports to 15 SAS or SATA ports. The 2.5-inch disks are also supported. The RAID properties primarily depend on the types of RAID controller cards on the mainboard. The hard disk backboard acts only as a physical channel.

After the SGPIO signal of the RAID controller card is parsed by the complex programmable logical device (CPLD) of the mainboard, the indicator signal of the hard disk is obtained and then transferred to the CPLD of the hard disk backboard over the user-defined serial port. The SAS Expander chip provides 15 hard disk indicators. The SGPIO signal output by the SAS Expander chip is parsed by the CPLD on the hard disk backboard to light the indicators, so that the RAID status, such as activating, locating, reconstructing, and fault, is reflected by the hard disk indicators on the CH222 panel.

The signal indicating whether the hard disk is installed, the hard disk backboard ID, and PCB ID are also transferred to the CPLD on the mainboard over the user-defined serial port.

Figure 2-11 Logical architecture
Updated: 2019-08-16

Document ID: EDOC1000018075

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