The [Batch node agent](https://github.com/Azure/Batch/blob/master/changelogs/nodeagent/CHANGELOG.md) is a program that runs on each node in the pool and provides the command-and-control interface between the node and the Batch service. There are different implementations of the node agent, known as SKUs, for different operating systems. When you create a pool based on the Virtual Machine Configuration, you must specify not only the size of the nodes and the source of the images used to create them, but also the **virtual machine image reference** and the Batch **node agent SKU** to be installed on the nodes. For more information about specifying these pool properties, see [Provision Linux compute nodes in Azure Batch pools](batch-linux-nodes.md). You can optionally attach one or more empty data disks to pool VMs created from Marketplace images, or include data disks in custom images used to create the VMs. When including data disks, you need to mount and format the disks from within a VM to use them.
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