Managing host power states

You can conveniently shut down or reboot a host or an SCVM in an ACOS cluster on AOC via the host power management feature.

In a cluster, you can only shut down or reboot one host at a time.

Scenarios

In the following scenarios, shutting down or rebooting the host on AOC can improve operation and maintenance efficiency:

• When modifying configurations, such as modifying the port SR-IOV, host IOMMU and other system configurations, you need to place the host in maintenance mode and reboot the host for the configuration to take effect.

• When replacing hardware, such as replacing memory, NIC, CPU, storage controller, etc., you need to place the host in maintenance mode and then shut down the host and perform offline maintenance operations.

In the event of an emergency shutdown or host reboot, you can force shutdown or reboot the host when it is not in maintenance mode.

Risk warning

If the host is not configured to enter maintenance mode or if you forcibly shut down or reboot the host while it is entering maintenance mode, the virtual machines on the host will be forcibly shut down. If the virtual machine has HA enabled, it will first trigger HA. If the virtual machine has enabled Autostart with host, it will automatically start when the host is powered on.

• When a file storage cluster is deployed on an ACOS (AVE) cluster, for each file storage cluster, if you shut down two or more hosts where the file controller is located, the file storage cluster and the file storage service it provides might become unavailable.

Shutting down or rebooting a host (AVE only)

Prerequisites

• The AOC virtual machine is not running on the current host.

• The current host is in the Healthy, Initializing or Abnormal state.

• After the current host is shut down, the remaining number of hosts in the cluster meets the requirements for electing the master node.

• The cluster is not using the management IP address of the current host to associate with AOC.

• The host is currently in maintenance mode.

  If the host is not in maintenance mode and is forced to shut down or reboot, ensure that the following conditions are met:

  • If there are virtual volumes in the cluster whose redundancy policy is erasure coding, in addition to the current host, the number of hosts in the cluster that are with a healthy storage service and are not being removed and is not less than the number of data blocks (K) configured for the erasure coding of any virtual volume.
  • There is sufficient free storage space in other hosts in the cluster, that is, the following two conditions are met:
    • The available storage capacity on the remaining hosts in the cluster > the used storage capacity on the current host
    • The available write cache capacity on the remaining hosts in the cluster > the used write cache capacity on the current host
  • The current host has no data with only one replica.

Precaution

If the host is not configured to enter maintenance mode or if you forcibly shut down or reboot the host while it is entering maintenance mode, the virtual machines on the host will be forcibly shut down. If the virtual machine has HA enabled, it will first trigger HA. If the virtual machine has enabled Autostart with host, it will automatically start when the host is powered on.

Procedure

1. Log in to AOC, select the target host in the host list of the cluster, click the ellipsis (...) on the right, and then select Shutdown or Reboot.

2. Enter the reason in the opened dialog box, and click Shutdown or Reboot.

   After submitting the task, you can check the task progress and whether the task is successfully completed in the task center.

Shutting down or rebooting an SCVM (VMware ESXi only)

Shutting down or rebooting the SCVM in AOC will not affect the power state of the ESXi host.

Prerequisites

• The current SCVM is in the Healthy, Initializing or Abnormal state.

• After the current SCVM is shut down, the remaining number of SCVMs in the cluster meet the requirements for electing the master node.

• The cluster is not using the management IP address of the current SCVM to associate with AOC.

• The SCVM is in maintenance mode.

  If the SCVM is not in maintenance mode and is forced to shut down or reboot, ensure that the following conditions are met:

  • If there are NFS exports in the cluster whose redundancy strategy is erasure coding, in addition to the current SCVM, the number of SCVMs in the cluster that are with a healthy storage service and are not being removed is not less than the number of data blocks (K) configured for the NFS export erasure coding.
  • The ESXi hosts corresponding to other SCVMs in the cluster have sufficient free storage space, that is, they meet the following two conditions:
    • The available storage capacity on the ESXi hosts corresponding to the remaining SCVMs in the cluster is greater than the used storage capacity on the ESXi host corresponding to the current SCVM.
    • The available write cache capacity on the ESXi hosts corresponding to the remaining SCVMs in the cluster is greater than the used write cache capacity on the ESXi host corresponding to the current SCVM.
  • The ESXi host corresponding to the current SCVM has no data with one replica.

Procedure

1. Log in to AOC, select the target SCVM in the host list of the cluster, click the ellipsis (...) on the right, and then select Shutdown SCVM or Reboot SCVM.

2. Enter the reason in the opened dialog box, and click Shutdown SCVM or Reboot SCVM.

   After submitting the task, you can check the task progress and whether the task is successfully completed in the task center.

   If you need to shut down or reboot the ESXi host, after shutting down the SCVM, follow the prompts in the Shutdown SCVM dialog box and the VMware technical documentation to shut down or reboot the ESXi host on the VMware page.