Definition of data nodes

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A data node executes the instructions sent by the management node, reports the task status, stores data, and provides other public functions.

Other related questions:
Definition of management nodes
A management node is the management system of a FusionInsight cluster. It provides a unified access entry and manages the nodes and services deployed in the cluster in a unified manner.

Definition of control nodes?
A control node controls and monitors how data nodes store and receive data, and send process status, and provides other public functions.

OceanStor 9000 V100R001C01 data recovery for a failed node
OceanStor 9000 V100R001C01 recovers data for a failed node using the following methods: 1. If the failed node turns normal, OceanStor 9000 V100R001C01 recovers data changes within the offline duration to a normal node and ensures zero loss of original data on the failed node. 2. If the offline node requires an operation by the administrator, OceanStor 9000 V100R001C01 obtains the data on the failed node through calculations and writes the data to disks of other normal nodes.

How to Back Up Data for the FSM Node in FusionStorage
Use PuTTY to log in to the active FSM node. Ensure that the FSM floating IP address and username dsware are used to establish the connection. Run the following command to disable logout on timeout: TMOUT=0 Back up data for the FSM node to the local server. Run the following command to switch to the directory containing the FSM command configuration tool: cd /opt/dsware/client/bin/ Run the following commands to issue the command for manually backing up FSM data on the local server: NOTE: Because of system security hardening, you are required to enter the username and password for authentication after running the dswareTool command of FusionStorage. The default username to be authenticated is cmdadmin, and its default password is cmdHuawei@123. The system supports authentication using environment variables so that you do not need to repeatedly enter the username and password for authentication after running the dswareTool command each time. For details about how to import environment variables, see Authentication Using Environment Variables. sh dswareTool.sh --op executeBackupCmd If the command output contains "Operation finish successfully", the command is issued successfully. ... Operation finish successfully. Result Code:0 ... Check the backup files stored on the local FSM server. Run the following command and enter the password of user root to switch to user root: su - root Run the following command to disable logout on timeout: TMOUT=0 About 5 minutes after the manual backup command is issued, run the following command to switch to the directory containing the manual backup files: cd /opt/dsware/manager/backup/manual/ Run the following command to view the files stored in the directory: ll Check whether the directory contains the latest backup file. If yes, go to Step 10. If no, contact technical support. Determine whether to back up data to a third-party backup server. Determine whether a third-party backup server is configured. If yes, go to Step 11. If no, no further action is required. Check the backup files stored on the third-party backup server. Determine the type of the OS used by the third-party backup server. If the server runs Windows OS, go to Step 12. If the server runs Linux OS, go to Step 15. About 10 minutes after the local backup is successful, log in to the third-party backup server over a remote desktop connection. For details, see Logging In to a VM in Remote Mode. Switch to the directory containing backup files. Directory containing manual backup files: Directory configured on the FTPS server\CloudComputing\DswareMgr_FSM floating IP address\manual Check the files in the directory, then perform Step 19. About 10 minutes after the local backup is successful, use PuTTY to log in to the third-party backup server. Ensure that the IP address of the third-party backup server and username root are used to establish the connection. Run the following command to disable logout on timeout: TMOUT=0 Run the following command to switch to the directory containing backup files: cd Directory configured on the FTPS server/CloudComputing/DswareMgr_FSM floating IP address/manual Run the following command to view the files stored in the directory: ll Check whether the directory contains the latest backup file. If yes, no further action is required. If no, contact technical support.

Distributing data slices evenly on each node of OceanStor 9000
Distributing data slices evenly on each node of OceanStor 9000: Data slices of OceanStor 9000 are achieved using Erasure Code. For details, see: - Information about data protection in OceanStor 9000 V100R001C01 Administrator Guide 11 - OceanStor 9000 V100R001 Erasure Code Multimedia 03

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