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=====================
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Environment Variables
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=====================
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The behavior of the client can also be controlled using environment variables. The value of the environment variables overrides the values in the configuration file.
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The environment variables are:
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- `OWNCLOUD_CHUNK_SIZE` (default: 5242880; 5 MiB) – Specifies the chunk size of uploaded files in bytes. Increasing this value may help with synchronization problems in certain configurations.
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- `OWNCLOUD_TIMEOUT` (default: 300 s) – The timeout for network connections in seconds.
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- `OWNCLOUD_CRITICAL_FREE_SPACE_BYTES` (default: 512\*1000\*1000 bytes) - The minimum disk space needed for operation. A fatal error is raised if less free space is available.
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- `OWNCLOUD_FREE_SPACE_BYTES` (default: 1000\*1000\*1000 bytes) - Downloads that would reduce the free space below this value are skipped. More information available under the "Low Disk Space" section.
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- `OWNCLOUD_MAX_PARALLEL` (default: 6) - Maximum number of parallel jobs.
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- `OWNCLOUD_BLACKLIST_TIME_MIN` (default: 25 s) - Minimum timeout for blacklisted files.
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- `OWNCLOUD_BLACKLIST_TIME_MAX` (default: 24\*60\*60 s; one day) - Maximum timeout for blacklisted files.
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Low Disk Space
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^^^^^^^^^^^^^^
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When disk space is low the Nextcloud Client will be unable to synchronize all files. This section describes its behavior in a low disk space situation as well as the options that influence it.
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1. Synchronization of a folder aborts entirely if the remaining disk space falls below 512 MB. This threshold can be adjusted with the ``OWNCLOUD_CRITICAL_FREE_SPACE_BYTES`` environment variable.
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2. Downloads that would reduce the free disk space below 1 GB will be skipped or aborted. The download will be retried regularly and other synchronization is unaffected. This threshold can be adjusted with the ``OWNCLOUD_FREE_SPACE_BYTES`` environment variable.
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