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The VM groups hold both a\n+\"vm_spec\" and a \"disk_spec\" which contain the parameters needed to\n+create members of that group. Here is an example of an expanded configuration:\n+```\n+hbase_ycsb:\n+  vm_groups:\n+    loaders:\n+      vm_count: 4\n+      vm_spec:\n+        GCP:\n+          machine_type: n1-standard-1\n+          image: ubuntu-14-04\n+          zone: us-central1-c\n+        AWS:\n+          machine_type: m3.medium\n+          image: ami-######\n+          zone: us-east-1a\n+        # Other clouds here...\n+      # This specifies the cloud to use for the group. This allows for\n+      # benchmark configurations that span clouds.\n+      cloud: AWS\n+      # No disk_spec here since these are loaders.\n+    master:\n+      vm_count: 1\n+      cloud: GCP\n+      vm_spec:\n+        GCP:\n+          machine_type: n1-standard-1\n+          image: ubuntu-14-04\n+          zone: us-central1-c\n+        # Other clouds here...\n+      disk_count: 1\n+      disk_spec:\n+        GCP:\n+          disk_size: 100\n+          disk_type: standard\n+          mount_point: /scratch\n+        # Other clouds here...\n+    workers:\n+      vm_count: 4\n+      cloud: GCP\n+      vm_spec:\n+        GCP:\n+          machine_type: n1-standard-4\n+          image: ubuntu-14-04\n+          zone: us-central1-c\n+        # Other clouds here...\n+      disk_count: 1\n+      disk_spec:\n+        GCP:\n+          disk_size: 500\n+          disk_type: remote_ssd\n+          mount_point: /scratch\n+        # Other clouds here...\n+```\n+\n+For a complete list of keys for vm_specs and disk_specs see\n+[virtual_machine.BaseVmSpec](https://github.com/GoogleCloudPlatform/PerfKitBenchmarker/blob/master/perfkitbenchmarker/virtual_machine.py)\n+and\n+[disk.BaseDiskSpec](https://github.com/GoogleCloudPlatform/PerfKitBenchmarker/blob/master/perfkitbenchmarker/disk.py)\n+and their derived classes.\n+\n+User configs are applied on top of the existing default config and can be\n+specified in two ways. The first is by supplying a config file via the\n+`--benchmark_config_file` flag. The second is by specifying a single setting to\n+override via the `--config_override` flag.\n+\n+A user config file only needs to specify the settings which it is intended to\n+override. For example if the only thing you want to do is change the number of\n+VMs in a group, this config is sufficient:\n+```\n+cluster_boot:\n+  vm_groups:\n+    default:\n+      vm_count: 100\n+```\n+You can achieve the same effect by specifying the `--config_override` flag.\n+The value of the flag should be a path within the YAML (with keys delimited by\n+periods), an equals sign, and finally the new value:\n+```\n+--config_override=cluster_boot.vm_groups.default.vm_count=100\n+```\n+See the section below for how to use pre-provisioned machines in your 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