Article Number: 000188715
Below are the steps to place a Member of vSAN Cluster in Maintenance Mode ready for reboot.
Before you shut down, reboot, or disconnect a host that is a member of a vSAN cluster, you must place the host in maintenance mode. When you place a host in maintenance mode, you must select a data evacuation mode, such as Ensure accessibility or Full data migration.
When any member host of a vSAN cluster enters maintenance mode, the cluster capacity is automatically reduced, because the member host no longer contributes capacity to the cluster.
Any vSAN iSCSI targets that are served by this host are transferred to other hosts in the cluster, and the iSCSI initiator are redirected to the new target owner.
Procedure:
You place a host in maintenance mode when you must service it such as to install more memory. A host enters or leaves maintenance mode only as the result of a user request.
Virtual machines that are running on a host entering maintenance mode must be migrated to another host (either manually or automatically by DRS) or shut down. The host is in a state of Entering Maintenance Mode until all running virtual machines are powered down or migrated to different hosts. You cannot turn on virtual machines or migrate virtual machines to a host entering maintenance mode.
When no more running virtual machines are on the host, the host s icon changes to include under maintenance and the host s Summary panel indicates the new state. While in maintenance mode, the host does not allow you to deploy or turn on a virtual machine.
Note: DRS does not recommend (or perform, in fully automated mode) any virtual machine migrations off a host entering maintenance or standby mode if the vSphere HA failover level would be violated after the host enters the requested mode.
The host is in maintenance mode until you select Maintenance Mode > Exit Maintenance Mode.
Once the host has been rebooted, memory self-healing has either run or was not required. We must look for VXR500UEFI0278/UEFI0278 in either VC or IDRAC respectively. If this message appears, it means that memory self-healing was required and it failed.
This requires a DIMM replacement, and a case should be opened with support for replacement. All other instances are considered a false positive.
VxRail Appliance Family
VxRail Appliance Series
21 Feb 2022
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Solution