Whether a 2.5-inch disk enclosure and a 3.5-inch disk enclosure can be connected to the same loop

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A 2.5-inch disk enclosure and a 3.5-inch disk enclosure cannot be connected to the same loop. They must be connected to different SAS ports.

Other related questions:
V3 disk enclosure
V3 disk enclosures are described as follows: A disk enclosure adopts a modular design and consists of a system enclosure, expansion modules, power modules, and disk modules.

Method used to connect the storage device's controller enclosures and disk enclosures
Visit the following website and refer to the networking assistant: http://support.huawei.com/onlinetoolsweb/sna/?language=en

Maximum number of disk enclosures that can be connected to a pair of SAS ports
A maximum of eight SAS common disk enclosures can be connected to a pair of SAS ports. High-density disk enclosures require two pairs of SAS ports, which support a maximum of eight high-density disk enclosures. Common and high-density disk enclosures cannot be connected to the same SAS loop.

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.

Precautions for cascading disk enclosures
Note the following when cascading disk enclosures: 1. Ensure that the model of the disk enclosure to be added is the same as that of the existing disk enclosure. 2. After disks are inserted and the disk enclosure is turned on, the disk enclosure is automatically powered on and started up. 3. After the disk enclosure is powered on, use cascading cables to connect the disk enclosure to the controller enclosure. The storage system can then automatically identify the new disk enclosure. You do not need to suspend services when cascading disk enclosures. However, if disk enclosures are cascaded when services are running, a SAS/Fibre Channel loop or flapping may occur, adversely affecting the services. For this reason, to protect customer services and data security, suspend services and add disk enclosures during off-peak hours.

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