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Following are the existing flavors of these modules:

*Random: This just shuffles the list of clusters/hosts/pools that is returned by the DB lookup. Random does not mean round-robin - So if you are looking for a new host being picked up on every deployment - that may not happen.

*FirstFit:  This makes sure that clusters are ordered by available capacity and first hosts/pools having enough capacity is chosen within a cluster.

*UserDispersing: For a given account, this makes sure that VM's are dispersed  - so clusters/hosts with minimum number of running VM's for that account are chosen first. Storage Pool with minimum number of Ready storage pools for the account is chosen first.

*Userconcentratedpod: Always choose the pod/cluster with max. number of VMs for the account - concentrating VM's at one pod.

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