Component Description
This section provides the detailed illustration and description for each component.
System Subrack
The system subrack houses a midplane to provide reliable connections for interface modules and to distribute power and signals to inner modules.
Controller
A controller is the core component of a storage system. It processes storage services, receives configuration management commands, saves configuration data, connects to disks, and saves critical data onto coffer disks. Each controller houses one CBU (supercapacitor) to supply power to a controller enclosure in the event of unexpected power failures.
Each controller has one built-in disk. The disk is used to store the data of a storage system and the data in cache after a power failure. The disk built in one controller and the one built in another are redundant for each other.
Ports
Figure 4-38 describes the ports of a controller.
Only serial cables can be inserted into the serial ports. Do not insert network cables into the serial ports.
Indicators
Table 4-9 describes the states and corresponding meanings of indicators on a controller after it is powered on.
Indicator |
Status and Description |
|---|---|
10GE/25GE port indicator |
|
Link/Active indicator of the management network port |
|
Speed indicator of the management network port |
|
Controller Power indicator |
|
Controller Alarm indicator |
|
Built-in FRU Alarm indicator |
|
Indicator of the mini SAS HD expansion port |
|
Link/Active indicator of the GE electrical port |
|
Speed indicator of the GE electrical port |
|
BBU
A BBU provides backup power for a storage system during an external power failure, protecting the integrity of service data. When the external power supply is normal, BBUs are standby. In the event of a power failure, BBUs provide power for the storage system. A faulty BBU can be isolated without affecting the normal running of the storage system. If a power failure occurs, BBUs ensure that the storage system writes cached data to the built-in disks of the controllers, preventing data loss. After the external power supply resumes, the driver reads data from the built-in disks of the controllers to the cache. In a system using the lithium batteries, the battery capacity is updated and detected by charging and discharging the batteries. In this way, the problems can be detected in advance that the battery capacity attenuates, the batteries fail to meet the power backup requirements of the system, and thus the data backup fails when the batteries are not used for a long time. Then, the reliability of data protection upon the system power failure can be improved.
Appearance
Figure 4-39 shows the appearance of a BBU. Figure 4-40 shows the front view of a BBU.
Indicator
Table 4-10 describes the indicator on a BBU of a storage system that is powered on.
Indicator |
Status and Description |
|---|---|
Running/Alarm indicator on a BBU |
|
Fan Module
A fan module dissipates heat and enables a controller enclosure to work properly at the maximum power consumption.
Indicators
A fan module is located inside a controller and its running status can be determined from the built-in FRU Alarm indicator or alarm information on DeviceManager. For details about the built-in FRU Alarm indicator, see Indicator Introduction.
Power Module
Power modules can ensure that a controller enclosure works correctly in maximum power consumption mode.
Each controller enclosure has two power supply units (PSUs), named PSU 0 and PSU 1. The two PSUs form a power plane and work in redundancy mode to supply power to controllers A and B. To ensure power supply reliability, you are advised to insert PSU 0 and PSU 1 into different PDUs.
Indicators
Table 4-11 describes the indicator on a power module of a powered-on storage system.
Indicator |
Status and Description |
|---|---|
Running/Alarm indicator of the power module |
|
Disk Module
Disk modules provide storage capacity for a storage system. Disk modules can function as system coffer disks to save service data, system data, and cache data.
Appearance
Figure 4-43 shows the appearance of a 2.5-inch disk module. Figure 4-44 shows the appearance of a 3.5-inch disk module.
Indicators
Table 4-12 describes indicators on a disk module of a powered-on storage system.
Indicator |
Status and Description |
|---|---|
Running indicator of the disk module |
|
Alarm/Location indicator of the disk module |
|