Number of coffer disks in an OceanStor V3 storage system and capacity occupied by the coffer disks

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The first four disks in the controller enclosure of the OceanStor 5300 V3/5500 V3 are planned as coffer disks.
The first four disks in the first disk enclosure of the OceanStor 5600 V3/5800 V3/6800 V3 are planned as coffer disks. Coffer disks are used to store important data of a storage system.
Each coffer disk occupies 5 GB of the capacity. Four coffer disks occupy 20 GB in total.

Other related questions:
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.

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.

Can a coffer disk be replaced by the coffer disk in another controller enclosure?
No. Coffer disks are used to store important data for the storage system, including configuration data, event information, and log information. When the storage system encounters an unexpected power failure, data in cache is written onto coffer disks. Even the two controller enclosures are of the same manufacturer and type, data stored on their coffer disks is different; therefore, coffer disks in different controller enclosures cannot be interchanged.

Whether coffer disks of OceanStor T/V3 series unified storage can be configured as RAID or member disks
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. Coffer disks can be added to RAID groups as member disks.

Whether the operating system is stored in coffer disks of the OceanStor T Series unified storage system
The operating system of the OceanStor T Series unified storage is installed on controllers, not coffer disks. Coffer disks store configuration data of the storage system, events, logs, and data in the cache when a power supply unit (PSU) fails. Remaining capacity of coffer disks can be used to store service data.

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