-{% include 'tutorial_expectations' %}
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-The Arvados distributed file system is called *Keep*. Keep is a content-addressable file system. This means that files are managed using special unique identifiers derived from the _contents_ of the file, rather than human-assigned file names (specifically, the MD5 hash). This has a number of advantages:
-* Files can be stored and replicated across a cluster of servers without requiring a central name server.
-* Both the server and client systematically validate data integrity because the checksum is built into the identifier.
-* Data duplication is minimized—two files with the same contents will have in the same identifier, and will not be stored twice.
-* It avoids data race conditions, since an identifier always points to the same data.
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-h1. Putting Data into Keep