Datastage – Grid vs Cluster

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A Grid uses software to auto-gen the APT file to use a subset of resources based on compute node use. A Cluster is a group of Datastage servers where The admin/designer designs the APT file to use the compute node resources available
Under the GRID software, it will look at the utilisation of the compute nodes on the grid and pick which machines are underused and dispatch the job to these nodes. If you have a group of 25 compute nodes, the designer would write his APT file to use 4 compute nodes. If those nodes are busy, Datastage would still try and use those nodes