Overview

Overall Structure

Figure 4-100 shows the overall structure of a controller enclosure.

Figure 4-100 Overall structure of a controller enclosure

• When a controller enclosure is configured with two controllers, the controllers are installed in the first and third slots from top to bottom, and assistant cooling modules are installed in the second and fourth slots. Controllers communicate with each other using internal heartbeat links and do not need cable connections.
• Slots are functional areas on the hardware subrack of a storage system and are used for installing and securing disks, interface modules, controllers, fan modules, and power modules.

Front View

Figure 4-101 shows the front view of a controller enclosure.

Figure 4-101 Front view of a controller enclosure

• Each controller has seven fan modules.
• The controllers are A, C, B, D in a top-down sequence.

Rear View

Figure 4-102 and Figure 4-103 show the rear view of a controller enclosure equipped with AC power modules.

Figure 4-102 Rear view of a controller enclosure (with 12 Gbit/s SAS expansion modules)

Figure 4-103 Rear view of a controller enclosure (with 100 Gbit/s RDMA back-end interface modules)

• Only serial cables can be inserted into the serial ports. Do not insert network cables into the serial ports.
• Do not connect the management network port and maintenance network port to the same LAN or switch to prevent network loops.

The management modules of a 4 U controller enclosure are installed in slots SMM 0 and SMM 1. The slot numbers of interface modules are arranged from left to right as follows:

• The upper slots are IOM H0, IOM H1, IOM H2, IOM H3, IOM H4, IOM H5, IOM H6, IOM H7, IOM H8, IOM H9, IOM H10, IOM H11, IOM H12, and IOM H13.
• The lower slots are IOM L0, IOM L1, IOM L2, IOM L3, IOM L4, IOM L5, IOM L6, IOM L7, IOM L8, IOM L9, IOM L10, IOM L11, IOM L12, and IOM L13.

The rules for installing interface modules on a controller enclosure are as follows:

• For reliability purposes, it is recommended that interface modules should be installed in pairs. That is, the same interface module should be installed in the upper slot and corresponding lower slot separately.
• The scale-out interface modules are installed in the following sequence: IOM H3/L3 > IOM H10/L10.
• Configuration rules for back-end interface modules:
  • 12 Gbit/s SAS expansion modules can be installed only in slots IOM H5, IOM L5, IOM H6, IOM L6, IOM H7, IOM L7, IOM H8, and IOM L8. The sequence of installation is IOM H6/L6 > IOM H7/L7 > IOM H5/L5 > IOM H8/L8.
  • 100 Gbit/s RDMA expansion modules are installed in the following slot sequence: IOM H6/L6 > IOM H7/L7 > IOM H5/L5 > IOM H8/L8 > IOM H4/L4 > IOM H9/L9 > IOM H2/L2 > IOM H11/L11 > IOM H1/L1 > IOM H12/L12 > IOM H3/L3 > IOM H10/L10.

    The SO 100 Gbit/s RDMA interface module used for adding controller enclosures can be installed only in slots IOM H3/L3 and IOM H10/L10. When connecting disk enclosures, do not use these slots unless other slots are not enough for disk enclosure connection.

• Configuration rules for front-end interface modules:

  If Ethernet interface modules are used, you must configure one interface module in each of the A, B, C, and D quadrants in the four-controller system or in each of the A and B quadrants in the dual-controller system. Insert the interface modules used for iSCSI networking in ascending order of their port rates. Then insert the interface modules used for Fibre Channel networking in ascending order of their port rates.

  • In the four-controller system:
    • When 12 Gbit/s SAS expansion modules are configured at the back end, front-end interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H13/L13 > IOM H1/L1 > IOM H12/L12 > IOM H2/L2 > IOM H11/L11 >IOM H4/L4 > IOM H9/L9 > IOM H3/L3 > IOM H10/L10.
    • When 100 Gbit/s RDMA interface modules are configured at the back end, front-end interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H13/L13 > IOM H1/L1 > IOM H12/L12 > IOM H2/L2 > IOM H11/L11 > IOM H4/L4 > IOM H9/L9> IOM H5/L5 > IOM H8/L8 > IOM H3/L3 > IOM H10/L10 > IOM H7/L7.
  • In the dual-controller system:
    • When 12 Gbit/s SAS expansion modules are configured at the back end, front-end Ethernet interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H1/L1 > IOM H2/L2 > IOM H4/L4 > IOM H3/L3. Front-end Fibre Channel interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H13/L13 > IOM H1/L1 > IOM H12/L12 > IOM H2/L2 > IOM H11/L11 >IOM H4/L4 > IOM H9/L9 > IOM H3/L3 > IOM H10/L10.
    • When 100 Gbit/s RDMA interface modules are configured at the back end, front-end Ethernet interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H1/L1 > IOM H2/L2 > IOM H4/L4 > IOM H5/L5 > IOM H3/L3. Front-end Fibre Channel interface modules are installed in the following slot sequence: IOM H0/L0 > IOM H13/L13 > IOM H1/L1 > IOM H12/L12 > IOM H2/L2 > IOM H11/L11 > IOM H4/L4 > IOM H9/L9> IOM H5/L5 > IOM H8/L8 > IOM H3/L3 > IOM H10/L10 > IOM H7/L7.
• The management modules are mandatory, which are used for management and maintenance.
• The maintenance network port is used for special management and maintenance only by Huawei technical support engineers in emergency. It cannot be connected to the same network as the management network port, because doing so may cause a network loopback or network storm. The initial IP address of the maintenance network port is 172.31.128.101 or 172.31.128.102. The default subnet mask is 255.255.0.0. You are advised to connect only the management network port to the network.

Hardware Specifications

Table 4-35 lists the dimensions and weight of the controller enclosure. For more specifications, refer to Specifications query (https://support-it.huawei.com/spec/#/home).