VMware's "flings" are completely free projects offered by VMware engineers. These flings are unsupported (except via comments on the website) and may or may not be part of upcoming commercial releases of vSphere (or other VMware products). VMware wants to get your feedback on the features offered in these flings and the VMware engineers genuinely care about their pet projects released as flings.
One of the latest flings is called "inventory snapshot". This free vSphere tool allows you to take a snapshot of an entire vCenter inventory and then reproduce that inventory on the same vCenter server or another vCenter server. Thus, you could reproduce a vCenter cluster on the same vCenter server or another server.
To give you some more detail, this vCenter inventory snapshot includes the folders, datacenters, clusters, resource pools, vApps, hierarchy, roles and permissions, configuration settings, and custom fields. In other words, if you have an inventory with a given set of hosts and VMs organized into a group of clusters, you can reproduce this environment, including the cluster settings and custom roles you may have defined.
This ability is helpful in a variety of use cases. Suppose you’ve spent a lot of time creating a development vCenter environment, and now you wish to deploy it in production. Using the Inventory Snapshot fling, you can snapshot your dev environment and recreate it on the production server, saving you the task of laboriously adding each host, creating the proper clusters and resource pools, etc.
Downloading Inventory Snapshot for vSphere
To use the snapshot fling, you would need vSphere 4.1 (including vCenter). With your vSphere infrastructure already up and running, you can download the inventory snapshot here
Unzip the file and place it in an convenient location.
You'll also need the latest version of Java installed AND VMware's PowerCLI.
From the inventory snapshot ZIP file, you can run inventory.bat
Keep in mind that PowerCLI is required because inventory snapshot will be creating a PowerCLI script that you will be modifying and then using to recreate your entire vSphere infrastructure (or a piece of it) on the same or another server.
Using Inventory Snapshot
Once you have met the requirements and have Inventory Snapshot ready to use run inventorySnapshot.bat to bring up the UI. In Linux and MacOS, you use the inventorySnapshot.sh shell script to bring up the graphical user interface.
You'll enter your vCenter hostname, username, password, and a path to store all the inventorysnapshot PowerCLI (PS1) snapshot files.