In a recommended high-availability (HA) deployment for a large FusionInsight HD cluster, node roles are strictly separated to ensure stability and performance.

1. DataNode Data Partition (E): The directory /srv/BigData/hadoop/data5 is used for storing HDFS data blocks by the DataNode service. In a standard architecture, DataNode services run exclusively on data nodes, not on control (management) nodes. Therefore, this partition will not exist on a control node.

2. OMS Database Partition (B): The directory /srv/BigData/dbdataom stores the database for the Operations and Maintenance System (OMS). OMS is deployed in an active/standby HA mode on two primary control nodes. However, a robust HA cluster requires a quorum of at least three control nodes for services like ZooKeeper and JournalNode. The third control node acts as a quorum peer but does not host the OMS service. Consequently, the /srv/BigData/dbdataom partition would not exist on this third control node.

A. /: This is the root filesystem partition, which is a fundamental requirement for the operating system on every node in the cluster, including control nodes.

C. /srv/BigData: This is the default base directory for the FusionInsight installation, component packages, and runtime data. It exists on all nodes where cluster components are installed.

D. /srv/BigData/journalnode: The JournalNode service is a critical component for HDFS NameNode HA and is deployed across the control node quorum (typically three nodes) to store edit logs.

1. Huawei FusionInsight HD 6.5.1 Installation Guide, Section: "Planning the Cluster" -> "HA Mode". This section details the deployment topology, specifying that OMS is deployed in active/standby mode on two management nodes, while JournalNode and ZooKeeper are deployed on three management nodes. This confirms that at least one control node will not host the OMS service.

2. Huawei FusionInsight HD 6.5.1 Installation Guide, Section: "Planning Disks" -> "Disk Partitions and Mount Points (Management Nodes)" and "Disk Partitions and Mount Points (Data Nodes)". These tables explicitly show that /srv/BigData/dbdataom is a partition for management nodes (hosting OMS) and /srv/BigData/hadoop/data partitions are for data nodes, confirming the role-based separation of these storage paths.