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I was playing around with VMware vSphere ESXi 4.1 recently and I found the warning message “HA initiated a failover action in cluster your-cluster-name in datacenter your-datacenter-name” keep show on my vCenter. Nothing has been changed, HA working like a charm, no VMs have been reboot and the warning message just annoying.

The solution are pretty simple.
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It been quite some times I did not migrate the ESX host from 1 vCenter to another. For most of the deployment recently, we were either deploy our vSphere 4 with DVswitch or Nexus 1000V from Cisco. Here are some steps you may want to consider when you migrate the ESX host from 1 vCenter to another if you are using DVswitch. Usually we can disconnect the ESX host from vCenter and remove it from inventory, and reconnect to the new vCenter. If you are follow this way for standard vSwitch, it shouldn’t cause you any problem, but if you deploy this way for the environment which using DVswitch, the new vCenter will give you error which shown the previous DVswitch record are still tie to the ESX host on a different vCenter. Do not get panic as the Network connectivity are still working as usual, but you will not able to connect the ESX host to the new DVSwitch.

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Yesterday, I did an APC PCNS installation for 4 unit of VMware vSphere 4 on my customer site and one of the ESX host go wild.

For some reason, I can’t login and the particular ESX host was disconnect for few minutes on vCenter server. Again, the console fly tons of weird error message for few minutes as screen shot below.

click to enlarge.
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VMware VMFS (Virtual Machine File System) is VMware, Inc.’s cluster file system designed for VMware Infrastructure or VMware vSphere. Basically VMFS used to store virtual machine disk images, including snapshots.

According to Wikipedia,

• VMFS version 1 was used by ESX Server v1.x, which is no longer sold. It didn’t feature the cluster filesystem properties and was used only by a single server at a time. VMFS1 is a flat filesystem with no directory structure. — Officially named “VMware File System”
• VMFS version 2 is used by ESX Server v2.x and (in a limited capacity) v3.x. VMFS2 is a flat filesystem with no directory structure. — Officially named “VMware File System”
• VMFS version 3 is used by ESX Server v3.x and vSphere (4.x). As a most noticeable feature, it introduced directory structure in the filesystem. Older versions of ESX Server cannot read or write VMFS3 volumes. Beginning from ESX 3 and VMFS3, virtual machine configuration files are stored in the VMFS partition by default. — Officially named “VMware Virtual Machine File System”

In order to know the exact VMFS version number, see below:
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VMware vSphere 4.1 was release on 13 July 2010 last week. VMware vSphere 4.1 introduced an impressive number of new features and new licensing format.

The following is complete VMware vSphere 4.1 license comparison chart.

Click here to enlarge.
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