There are several important alarms that should be enabled on a VMware vCenter Server in order to ensure the proper functioning and availability of your virtual infrastructure.
Some of the most important alarms to enable include:
Host connection and disconnection alarms: These alarms will notify you when a host becomes disconnected from vCenter, which could indicate a problem with the host or with the network connectivity.
Virtual machine power state change alarms: These alarms will notify you when a virtual machine changes power state, such as when it is powered on or powered off. This can help you monitor the availability of your virtual machines and quickly detect and troubleshoot issues.
Virtual disk usage alarms: These alarms will notify you when a virtual disk reaches a certain level of usage, such as when it is running low on free space. This can help you prevent data loss and ensure that your virtual machines continue to perform well.
Virtual machine resource usage alarms: These alarms will notify you when a virtual machine is using a high amount of resources, such as CPU or memory. This can help you detect and troubleshoot performance issues before they become critical.
Datastore usage alarms: These alarms will notify you when a datastore reaches a certain level of usage, such as when it is running low on free space. This can help you prevent data loss and ensure that your virtual machines continue to perform well.
Cluster resource usage alarms: These alarms will notify you when a cluster reaches a certain level of resource usage, such as when it is running low on free space. This can help you prevent data loss and ensure that your virtual machines continue to perform well.
Network adapter disconnection alarms: These alarms will notify you when a network adapter becomes disconnected from vCenter, which could indicate a problem with the host or with the network connectivity.
It is important to note that, Alarms can also be customized according to the requirements of the organization and it’s environment.