Can another hard disk in the enclosure become a coffer disk?

3

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. If a coffer disk is replaced by another hard disk in the enclosure, the storage system cannot run normally.

Other related questions:
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.

Can be Coffer Disks Exchanged with Other Hard Disks
is flushed from the memory as a storage device encounters an unexpected shutdown. If you exchange coffer disks with other hard disks, the storage device cannot work properly.

Hard disk capacity expansion for the USG6000 series
The USG6650/6660/6670/6680 supports dual hard disks. Do as follows to install a hard disk on the USG, which has been running for some time with a single hard disk: 1. Ensure that all configurations are saved. 2. Run the disk offline command in the system view. Wait for about 30 seconds until the system indicates that the hard disk stops working, remove the filler panel from the hard disk slot, and install a new hard disk unit. a. Remove the filler panel from the hard disk slot. HDD1 is used as an example. b. Hold the handlers of the tray and push the tray along the guide rails inside the hard disk slot till the tray panel aligns with the panel of the device. c. Press the tray handler inwardly to restore the tray. d. In the system view, run the reset raid primary-disk disk-id command to create a RAID group using disk-id as the primary disk for data synchronization. In this example, the command shall be reset raid primary-disk 0. Several hours later, run the display disk information command. If Filesystem Status is Mounted and DiskRaidMode is ACTIVE, both hard disks work properly. Note: After the RAID is created, the data in the active disk will be synchronized to the backup disk and the original data on the backup disk will be overwritten. Select the disk-id of the active disk before creating RAID.

Removing disks from a disk enclosure and inserting them into another disk enclosure of the same model on an OceanStor V3 storage system
Except for coffer disks, disks can be removed from a disk enclosure and inserted into another disk enclosure of the same model on an OceanStor V3 storage system. Coffer disks are the first four disks of the first disk enclosure. In coffer disks, the system writes the serial number of the enclosure where coffer disks reside. Upon power-on, the system checks the serial number and denies access of the enclosure if serial number inconsistency is detected. Note that the disk to be removed and reinserted cannot carry data. The disk is recognized as a newly added disk on the disk enclosure where it is reinserted. In addition, users are allowed to relocate a non-coffer storage pool member disk in a disk enclosure or across disk enclosures connected to the same engine. However, the interval cannot exceed two minutes between the removal and reinsertion. After the reinsertion, the storage pool automatically initiates a reconstruction, writing data that is supposed to be written during the absence of the reinserted disk.

Replacement of a malfunctioning coffer disk with a hot spare disk
A hot spare disk can replace a malfunctioning coffer disk if the two disks are of the same type and the hot spare disk provides a capacity equal to or larger than that of the coffer disk.

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