A large company could have 100s of clusters, it will be quite a nightmarish task to check all these manually. Hopefully you now understand why Limits are not good at all for any reason.Ĭluster HA and DRS in mostly all cases should always be enabled. You won’t get full performance until you remove the limit of the VM in vCenter. Even thou the VM has 24GB of memory configured, it will only be consuming 8GB of it because of the 8GB limit set on the VM. However, the configured memory is set to 24GB. For example, the VM I highlighted below has a memory limit of 8GB. A limit on a VM basically means the VM won’t perform more than what the limit is set to. If you see any type of VM limits this is not a good sign. Note: If this is blank you will need to enable the Guest File Free metric for VMs in all the active policies. For snapshots, most of the time snapshots should not be older than 7 days. The performance of the VM will suffer dramatically until you add more partition space. If I see any VM that has 0 capacity on the C: Drive or the Root Drive. None of the Fortune 500 companies that I know of has a VM that is higher than 10,000 IOPS. Anything over 10,000 IOPS is extremely rare and should be investigated immediately. If any VMs that has high IOPS or high network usage that looks off to you should be investigated. A busy VM such as heavy Database servers, File Servers, Exchange Server, etc will have IOPS in the range of 1000-8000 depending how busy it is. A typical VM usually doesn’t have more than 1000 IOPS. It just means that the VM has lots of disk activity. High Disk IOPs doesn’t mean there is a disk performance issue. If the latency drops down dramatically you will know it was the datastore that caused itįor VM Disk IOPS and Network Usage notice how this widget says awareness only. Another good way to find out if it’s the VM or the datastore that is causing the latency is by doing a storage vMotion to an isolated datastore. If the datastore is overworked, it will cause latency on other VMs that are hosted by it as well. Check to see if the datastore that the VM is on has high latency as well. If the VM Disk latency is high, this means your disk performance is suffering.
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