Component Description
This section provides the detailed illustration and description for each component.
System Subrack
The system subrack houses a midplane that provides reliable connections for interface modules and distributes 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 disk enclosures, and saves critical data onto coffer disks.
Each controller has one or more built-in disks to store system data. If a power failure occurs, such disks also store cache data. The disks built in one controller and those built in another are redundant for each other.
Appearance
Figure 4-31 shows the appearance of a controller. Figure 4-32 shows the front view of a controller.
1 |
Controller panel latch |
2 |
Running/Alarm indicator of the fan module |
3 |
Controller latch |
4 |
Controller alarm indicator |
5 |
Controller power indicator |
6 |
Controller handle |
Indicators
Table 4-7 describes the indicators on a controller of a storage system that is powered on.
No. |
Indicator |
Status and Description |
|---|---|---|
2 |
Running/Alarm indicator of the fan module |
|
4 |
Controller alarm indicator |
|
5 |
Controller power indicator |
|
Fan Module
A fan module dissipates heat and enables a controller enclosure to work properly at the maximum power consumption.
Appearance
Figure 4-33 shows the appearance of a fan module. Figure 4-34 shows the front view of a fan module.
1 |
Running/Alarm indicator of the fan module |
2 |
Fan module handle |
Indicators
Table 4-8 describes indicators on a fan module of a powered-on storage system.
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 4-35 shows the appearance of a BBU. Figure 4-36 shows the front view of a BBU.
1 |
BBU handle |
2 |
BBU latch |
3 |
Running/Alarm indicator on a BBU |
- |
- |
1 |
BBU handle |
2 |
BBU latch |
3 |
Running/Alarm indicator on a BBU |
- |
- |
Indicator
Table 4-9 describes the indicator on a BBU of a storage system that is powered on.
No. |
Indicator |
Status and Description |
|---|---|---|
3 |
Running/Alarm indicator on a BBU |
|
Management Module
A management module provides management ports, including a USB port, management network port, serial port, and maintenance network port.
Ports
Figure 4-37 shows a management module.
1 |
Management module handle |
2 |
Power indicator of the management module |
3 |
USB port |
4 |
Speed indicator of the management network port |
5 |
Management network port |
6 |
Link/Active indicator of the management network port |
7 |
Maintenance network port |
8 |
Serial port |
Indicators
Table 4-10 describes the indicators on a management module of a storage system that is powered on.
No. |
Indicator |
Status and Description |
|---|---|---|
2 |
Power indicator of the management module |
|
4 |
Speed indicator of the management network port |
|
6 |
Link/Active indicator of the management network port |
|
Power Module
Power modules are AC power modules and DC power modules that allow a controller enclosure to work properly at the maximum power consumption.
Appearance
Figure 4-38 shows the appearance of an AC power module. Figure 4-39 shows the appearance of a DC power module.
1 |
Power module handle |
2 |
Running/Alarm indicator of the power module |
3 |
Power module socket |
4 |
Cable tie |
1 |
Power module handle |
2 |
Running/Alarm indicator of the power module |
3 |
Positive and negative terminals of the power module |
- |
- |
Indicators
Table 4-11 describes indicators on a power module of a powered-on storage system.
No. |
Indicator |
Status and Description |
|---|---|---|
2 |
Running/Alarm indicator of the power module |
|
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