Whether disk reservation parameters are required during Oracle Real Application Cluster (RAC) configuration in AIX the system

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The following is the answer to whether disk reservation parameters are required during Oracle RAC configuration on the AIX system:
The disk reservation parameter controls the concurrent access permissions to the logical disk. To ensure concurrent access to the logical disk by multiple nodes in a cluster, you do not need to set the disk reservation parameter during Oracle RAC configuration in the AIX system and you can retain the default value no_reserve.

Other related questions:
Method used to change concurrent disks in the AIX operating system
To change concurrent disks, you need to stop service operations and perform the following steps: 1. Run lspv to check the volume group and disk status. 2. After services are stopped, run varyoffvg [vg_name] to activate specified volume groups. 3. Run lsattr -El updiskX | grep queue_depth to check the queue depth of specified disks. 4. Run chdev -a queue_depth=32 -l updiskX to change the queue depth of specified disks.

Reason why redundant disks appear in an AIX application server on an IP SAN network
The AIX application server is connected to the Ethernet switch through a network cable. The switch is connected to two iSCSI host ports on the same controller of the storage device through two network cables. When a LUN is mapped to the AIX application server, the AIX application server detects redundant disks. To enhance the data transfer reliability, an application server and a storage array are usually connected over multiple paths. If the multipathing software is unavailable, those multiple paths translate into multiple redundant disks, which confuse the actual number of disks. In the Ethernet networking, the AIX application server does not support the multipathing software. Therefore, redundant disks are detected on the AIX application server. On a Fibre Channel network, AIX application servers support the multipathing software.

Whether T series V100R005 unified storage supports the mixed use of disks in different models
For T series V100R005 unified storage devices, Huawei-certified disk modules that match the product model must be used as spare parts. Otherwise, services may be adversely affected.

Does V3 series unified storage support the mixed use of disks in different models?
No, the V3 series storage systems do not support the mixed use of disks in different models. Please purchase the disks of applicable models from Huawei.

What are the disk space requirements for creating a two-node cluster?
It is recommended that the disk space of the partition used to create a two-node cluster range from 10 GB to 30 GB. To view the disk space of the partition, perform the following operations: Step 1: Log in to the server where a two-node cluster is to be created as the root user. The default password of the root user is Change_Me. Step 2: Run the df -h command to view the disk size of the current host whose partition name is the same as the disk name of the /DB_DATA directory. If the disk size of the partition used to create a two-node cluster is greater than 30 GB or less than 10 GB, contact Huawei technical support engineers.

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