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OceanStor 9000 V300R006C00 Object Storage Service (Compatible with Amazon S3 APIs) Administrator Guide 07

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Starting and Stopping a Storage Node

Starting and Stopping a Storage Node

You can enable/disable, freeze/unfreeze, or start/shut down/restart a storage node in the cluster.

Prerequisites

When the BMC network and management network are inaccessible (due to physical isolation or firewall setting), the following actions cannot be performed:

Use DeviceManager, CLI, or SNMP to start a storage node in a cluster.

Context

Table 17-1 defines node operating status. Figure 17-1 shows the node operating status changes.

Table 17-1  Node operating status

Status

Description

Closed

The node is powered off.

Starting

The node is being started.

Online

The node is started and running correctly.

Offline

The node is offline due to a fault.

Disabled and Online

The node is disabled. Services on the node are switched over to other nodes and data on the node is migrated.

If not all storage nodes are required, you can disable and power off some nodes to reduce power consumption.

Disabled and Offline

The disabled and online node is powered off or encounters a fault.

Frozen and Online

The node is frozen. Services on a frozen node are switched over to other nodes.

The node is not powered off but can no longer process cluster services. Maintenance operations such as fault diagnosis can be performed on a node in this state.

Frozen and Offline

If the frozen and online node is powered off or encounters a fault, the node is frozen and offline.

Figure 17-1  Node operating status changes

Precaution

  • You can disable, freeze, power off, or restart a node to ensure data security. You can power off only one management node of the object storage service.
  • Management nodes of the object storage service cannot be deleted. Exercise caution when disabling a management node.
  • To ensure data security, in the event of disabling a object storage node, it is required that a minimum of four object storage nodes exist in the node pool where the node to be disabled resides. In addition, if disabling a node reduces the reliability of stored data, a message is displayed to indicate that the node cannot be disabled. In the event of freezing, powering off, or restarting a object storage node, it is required that a minimum of three object storage nodes exist in the node pool. If a node is faulty, prevent the node from staying offline for a long time. It is recommended that you rectify the fault as soon as possible. If the fault cannot be rectified, replace the node or the system disks of the node.
  • If any node in the storage cluster is in the Closed, Offline, Frozen and Online, or Frozen and Offline state, navigate to the interface for task management. Operate this node after it is disabled, frozen, powered off, or restarted.
  • To avoid data loss, nodes with SSDs cannot be in the powered-off state for over three months. If the nodes need to be powered off for a long time, ensure that they are powered on at least once every three months.
NOTE:
You can run the change node disable command to disable the node function. For details, see the OceanStor 9000 Command Reference.

Procedure

  1. Log in to DeviceManager.
  2. Choose Settings > Cluster Settings > Cluster Node Settings > Cluster Node Settings.

    You can perform operations listed in Table 17-2 for a storage node in a cluster.

    Table 17-2  Starting and stopping a storage node

    Operation

    Button

    Precautions

    Enabling a node

    Enable

    -

    Freezing a node

    More > Freeze

    After a node is frozen, it will not process services, which may reduce data reliability and system performance. In addition, you need to log in to DeviceManager again.

    Unfreezing a node

    More > Unfreeze

    -

    Shutting down a node

    More > Shut Down

    NOTICE:
    • Nodes are restarted at different speeds. As a result, the system may display alarms indicating that a node has logged out during the restart process. These alarms are automatically cleared after nodes are enabled successfully.
    • For a P12E, P25E, P36E, or C36E node, the change system ipmi_password admin command must be executed after cluster deployment or capacity expansion to change the password of iBMC user admin . In this manner, the Start function is available.
    • To reduce potential security risks, change the default password of the default account before the system is put into use, and periodically change the password later.
    • To avoid data loss, power on nodes on which SSDs are installed every three months.
    • When powering on a P12E, P25E, P36E, or C36E node using the iBMC port, type the password of user admin (default password: Admin@storage) as instructed. When powering off or restarting the node, type the password of the current account as instructed.
    • When powering on a P12, P25, P36, or C36 node using the IPMI port, type the password of user admin (default password: Admin@storage) as instructed. When powering off or restarting the node, type the password of the current account as instructed.
    • When powering on a C72 node, you can power on the node directly. When powering off or restarting the node, type the password of the current account as instructed.

    Starting a node

    More > Start

    Restarting a node

    More > Restart

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Updated: 2019-04-28

Document ID: EDOC1000122523

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