Reason why only the first four disk indicators on the controller enclosure are blinking when the storage system is powered by BBUs

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Reason why only the first four disk indicators on the controller enclosure are blinking when the storage system is powered by BBUs:
FAQ-Why are only the first four disk indicators on the controller enclosure blinking when the storage system is powered by BBUs

Other related questions:
Indicators of the first three coffer disks in a storage system blinking
It is normal that indicators of the first three coffer disks are blinking. It indicates that data is being transferred without interrupting services.

Functions of coffer disks of unified storage
Coffer disks of unified storage store the configuration data of the storage system, events, logs, and dirty data. Remaining capacity of coffer disks can be used to store storage service data.

Reason why the disk fault indicator is not on when the disk is faulty
The storage disk has the physical status and logical status. The physical status can be considered as the physical feature status of the disk. Therefore, you are advised to replace the disk when a physical fault occurs. The logical status is assigned by the software. In some cases, the disk can still be used when a logical fault occurs. When the I/O of the disk fails, the logic is faulty. If a disk is physically faulty, the logic is also faulty. The software turns on the fault indicator. Because the disk cannot be used, the disk fault indicator is on and prompts you to replace the disk. The logic of a disk is faulty, but the physical status may not be faulty. In some cases, the disk can still be used. Therefore, the disk fault indicator is not turned on.

Reason why only disks authenticated by Huawei can be used for Huawei storage systems
Reason why only disks authenticated by Huawei can be used for Huawei storage systems: The disk quality determines whether the storage system can run properly. Therefore, Huawei tests disks before delivery and filters disks that cannot work long time under greater pressure, thereby ensuring long-time proper operation of the storage system. If disks not authenticated by Huawei are used, an alarm is reported after the storage device is powered on.

Why does the storage system performance deteriorate when the BBU or battery power is insufficient?
This symptom is caused by the security mechanism of the storage system. When the BBU has insufficient power or is faulty, the LUN write policy is automatically changed to write through. This compromises the performance of the storage system. If the LUN write policy needs not to be changed as the BBU power becomes insufficient, change the write policy to Write Back Mandatory.

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