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Copy file name to clipboardExpand all lines: articles/batch/batch-compute-node-environment-variables.md
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| AZ_BATCH_HOST_LIST | The list of nodes that are allocated to a [multi-instance task](batch-mpi.md) in the format `nodeIP,nodeIP`. | Multi-instance primary and subtasks. |`10.0.0.4,10.0.0.5`|
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| AZ_BATCH_IS_CURRENT_NODE_MASTER | Specifies whether the current node is the master node for a [multi-instance task](batch-mpi.md). Possible values are `true` and `false`.| Multi-instance primary and subtasks. |`true`|
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| AZ_BATCH_JOB_ID | The ID of the job that the task belongs to. | All tasks except start task. | batchjob001 |
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| AZ_BATCH_JOB_PREP_DIR | The full path of the job preparation [task directory](files-and-directories.md) on the node. | All tasks except start task and job preparation task. Only available if the job is configured with a job preparation task. |C:\user\tasks\workitems\jobprepreleasesamplejob\job-1\jobpreparation|
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| AZ_BATCH_JOB_PREP_WORKING_DIR | The full path of the job preparation [task working directory](files-and-directories.md) on the node. | All tasks except start task and job preparation task. Only available if the job is configured with a job preparation task. |C:\user\tasks\workitems\jobprepreleasesamplejob\job-1\jobpreparation\wd|
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| AZ_BATCH_JOB_PREP_DIR | The full path of the job preparation [task directory](files-and-directories.md) on the node. | All tasks except start task and job preparation task. Only available if the job is configured with a job preparation task. |[AZ_BATCH_JOB_PREP_DIR](files-and-directories.md#az_batch_job_prep_dir)|
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| AZ_BATCH_JOB_PREP_WORKING_DIR | The full path of the job preparation [task working directory](files-and-directories.md) on the node. | All tasks except start task and job preparation task. Only available if the job is configured with a job preparation task. |[AZ_BATCH_JOB_PREP_WORKING_DIR](files-and-directories.md#az_batch_job_prep_working_dir)|
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| AZ_BATCH_MASTER_NODE | The IP address and port of the compute node on which the primary task of a [multi-instance task](batch-mpi.md) runs. Do not use the port specified here for MPI or NCCL communication - it is reserved for the Azure Batch service. Use the variable MASTER_PORT instead, either by setting it with a value passed in through command line argument (port 6105 is a good default choice), or using the value AML sets if it does so. | Multi-instance primary and subtasks. |`10.0.0.4:6000`|
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| AZ_BATCH_NODE_ID | The ID of the node that the task is assigned to. | All tasks. | tvm-1219235766_3-20160919t172711z |
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| AZ_BATCH_NODE_IS_DEDICATED | If `true`, the current node is a dedicated node. If `false`, it is an [Azure Spot node](batch-spot-vms.md). | All tasks. |`true`|
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| AZ_BATCH_NODE_LIST | The list of nodes that are allocated to a [multi-instance task](batch-mpi.md) in the format `nodeIP;nodeIP`. | Multi-instance primary and subtasks. |`10.0.0.4;10.0.0.5`|
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| AZ_BATCH_NODE_MOUNTS_DIR | The full path of the node level [file system mount](virtual-file-mount.md) location where all mount directories reside. Windows file shares use a drive letter, so for Windows, the mount drive is part of devices and drives. | All tasks including start task have access to the user, given the user is aware of the mount permissions for the mounted directory. |In Ubuntu, for example, the location is: `/mnt/batch/tasks/fsmounts`|
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| AZ_BATCH_NODE_ROOT_DIR | The full path of the root of all [Batch directories](files-and-directories.md) on the node. | All tasks. |C:\user\tasks|
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| AZ_BATCH_NODE_SHARED_DIR | The full path of the [shared directory](files-and-directories.md) on the node. All tasks that execute on a node have read/write access to this directory. Tasks that execute on other nodes do not have remote access to this directory (it is not a "shared" network directory). | All tasks. |C:\user\tasks\shared|
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| AZ_BATCH_NODE_STARTUP_DIR | The full path of the [start task directory](files-and-directories.md) on the node. | All tasks. |C:\user\tasks\startup|
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| AZ_BATCH_NODE_MOUNTS_DIR | The full path of the node level [file system mount](virtual-file-mount.md) location where all mount directories reside. Windows file shares use a drive letter, so for Windows, the mount drive is part of devices and drives. | All tasks including start task have access to the user, given the user is aware of the mount permissions for the mounted directory. |[AZ_BATCH_NODE_MOUNTS_DIR](files-and-directories.md#az_batch_node_mounts_dir)|
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| AZ_BATCH_NODE_ROOT_DIR | The full path of the root of all [Batch directories](files-and-directories.md) on the node. | All tasks. |[AZ_BATCH_NODE_ROOT_DIR](files-and-directories.md#az_batch_node_root_dir)|
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| AZ_BATCH_NODE_SHARED_DIR | The full path of the [shared directory](files-and-directories.md) on the node. All tasks that execute on a node have read/write access to this directory. Tasks that execute on other nodes do not have remote access to this directory (it is not a "shared" network directory). | All tasks. |[AZ_BATCH_NODE_SHARED_DIR](files-and-directories.md#az_batch_node_shared_dir)|
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| AZ_BATCH_NODE_STARTUP_DIR | The full path of the [start task directory](files-and-directories.md) on the node. | All tasks. |[AZ_BATCH_NODE_STARTUP_DIR](files-and-directories.md#az_batch_node_startup_dir)|
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| AZ_BATCH_POOL_ID | The ID of the pool that the task is running on. | All tasks. | batchpool001 |
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| AZ_BATCH_TASK_DIR | The full path of the [task directory](files-and-directories.md) on the node. This directory contains the `stdout.txt` and `stderr.txt` for the task, and the AZ_BATCH_TASK_WORKING_DIR. | All tasks. |C:\user\tasks\workitems\batchjob001\job-1\task001|
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| AZ_BATCH_TASK_DIR | The full path of the [task directory](files-and-directories.md) on the node. This directory contains the `stdout.txt` and `stderr.txt` for the task, and the AZ_BATCH_TASK_WORKING_DIR. | All tasks. |[AZ_BATCH_TASK_DIR](files-and-directories.md#az_batch_task_dir)|
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| AZ_BATCH_TASK_ID | The ID of the current task. | All tasks except start task. | task001 |
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| AZ_BATCH_TASK_SHARED_DIR | A directory path that is identical for the primary task and every subtask of a [multi-instance task](batch-mpi.md). The path exists on every node on which the multi-instance task runs, and is read/write accessible to the task commands running on that node (both the [coordination command](batch-mpi.md#coordination-command) and the [application command](batch-mpi.md#application-command). Subtasks or a primary task that execute on other nodes do not have remote access to this directory (it is not a "shared" network directory). | Multi-instance primary and subtasks. |C:\user\tasks\workitems\multiinstancesamplejob\job-1\multiinstancesampletask|
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| AZ_BATCH_TASK_WORKING_DIR | The full path of the [task working directory](files-and-directories.md) on the node. The currently running task has read/write access to this directory. | All tasks. |C:\user\tasks\workitems\batchjob001\job-1\task001\wd|
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| AZ_BATCH_TASK_SHARED_DIR | A directory path that is identical for the primary task and every subtask of a [multi-instance task](batch-mpi.md). The path exists on every node on which the multi-instance task runs, and is read/write accessible to the task commands running on that node (both the [coordination command](batch-mpi.md#coordination-command) and the [application command](batch-mpi.md#application-command). Subtasks or a primary task that execute on other nodes do not have remote access to this directory (it is not a "shared" network directory). | Multi-instance primary and subtasks. |[AZ_BATCH_TASK_SHARED_DIR](files-and-directories.md#az_batch_task_shared_dir)|
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| AZ_BATCH_TASK_WORKING_DIR | The full path of the [task working directory](files-and-directories.md) on the node. The currently running task has read/write access to this directory. | All tasks. |[AZ_BATCH_TASK_WORKING_DIR](files-and-directories.md#az_batch_task_working_dir)|
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| AZ_BATCH_TASK_RESERVED_EPHEMERAL_DISK_SPACE_BYTES | The current threshold for disk space upon which the VM will be marked as `DiskFull`. | All tasks. | 1000000 |
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| CCP_NODES | The list of nodes and number of cores per node that are allocated to a [multi-instance task](batch-mpi.md). Nodes and cores are listed in the format `numNodes<space>node1IP<space>node1Cores<space>`<br/>`node2IP<space>node2Cores<space> ...`, where the number of nodes is followed by one or more node IP addresses and the number of cores for each. | Multi-instance primary and subtasks. |`2 10.0.0.4 1 10.0.0.5 1`|
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> [!IMPORTANT]
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> When a node is removed from the pool, all of the files that are stored on the node are removed.
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## Batch root directory location
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## Batch task related files and directories location
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The value of the `AZ_BATCH_NODE_ROOT_DIR` compute node environment variable will be determined by the VM size and the presence of a local temporary disk.
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Numbers of compute node environment variables' value will be determined by the VM size and the presence of a local temporary disk.
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### AZ_BATCH_NODE_ROOT_DIR
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|Local Temporary Disk Present|Operating System Type|`AZ_BATCH_NODE_ROOT_DIR` Value|
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|:---|:---|:---|
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|No|Windows|`C:\batch\data`|
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|Yes|Windows|`D:\batch`|
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### AZ_BATCH_NODE_STARTUP_DIR
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|Local Temporary Disk Present|Operating System Type|`AZ_BATCH_NODE_STARTUP_DIR` Value|
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|:---|:---|:---|
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|No|Linux|`/opt/batch/data/startup`|
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|Yes|Linux|`/mnt/batch/startup` or `/mnt/resource/batch/startup`|
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|No|Windows|`C:\batch\data\startup`|
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|Yes|Windows|`D:\batch\startup`|
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### AZ_BATCH_NODE_SHARED_DIR
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|Local Temporary Disk Present|Operating System Type|`AZ_BATCH_NODE_SHARED_DIR` Value|
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|:---|:---|:---|
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|No|Linux|`/opt/batch/data/shared`|
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|Yes|Linux|`/mnt/batch/shared` or `/mnt/resource/batch/shared`|
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|No|Windows|`C:\batch\data\shared`|
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|Yes|Windows|`D:\batch\shared`|
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### AZ_BATCH_NODE_MOUNTS_DIR
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|Local Temporary Disk Present|Operating System Type|`AZ_BATCH_NODE_MOUNTS_DIR` Value|
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|:---|:---|:---|
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|No|Linux|`/opt/batch/data/fsmounts`|
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|Yes|Linux|`/mnt/batch/fsmounts` or `/mnt/resource/batch/fsmounts`|
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|No|Windows|`C:\batch\data\fsmounts`|
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|Yes|Windows|`D:\batch\fsmounts`|
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### AZ_BATCH_JOB_PREP_DIR
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|Local Temporary Disk Present|Operating System Type|`AZ_BATCH_JOB_PREP_DIR` Value|
|Yes|Linux|`/mnt/batch/tasks/workitems/jobprepreleasesamplejob/job-1/jobpreparation` or `/mnt/resource/batch/tasks/workitems/jobprepreleasesamplejob/job-1/jobpreparation`|
|Yes|Linux|`/mnt/batch/tasks/workitems/jobprepreleasesamplejob/job-1/jobpreparation/wd` or `/mnt/resource/batch/tasks/workitems/jobprepreleasesamplejob/job-1/jobpreparation/wd`|
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