Distributed file system and method of creating files effectively

An execution method of a metadata server, the execution method comprising:

• determining whether or not to request a data server to perform chunk allocation, to thereby secure available chunks in a chunk list pool in advance of a shortage of the available chunks in the chunk list pool;
• selecting a data server from a plurality of data servers;
• requesting the selected data server to allocate a plurality of chunks;
• inserting, by the metadata server, a list of chunks transmitted from the data server into the chunk list pool and determining an arrangement order of the chunk list pool;
• and
• fetching information on the available chunks from the chunk list pool,
• wherein when the chunk list pool has available chunks in a number of a number needed for a file storage request or more, in the fetching of the available chunk information, the available chunk information is fetched from the chunk list pool immediately upon a request of an external client for chunk information without requesting a data server to allocate the plurality of chunks.

An execution method of a distributed file system, the execution method comprising:

• determining, by a metadata server, whether or not to request a data server to perform chunk allocation, to thereby secure available chunks in a chunk list pool in advance of a shortage of the available chunks in the chunk list pool;
• selecting, by the metadata server, at least one data server from a plurality of data servers;
• requesting, by the metadata server, that the selected data server allocate a plurality of chunks;
• receiving, by the data server, the request for chunk allocation;
• allocating, by the data server, at least one chunk in response to the request for chunk allocation, and writing a list of chunks based on information about the allocated chunk;
• transmitting, by the data server, the list of chunks to the metadata server;
• inserting, by the metadata server, the list of chunks transmitted from the data server into the chunk list pool and determining an arrangement order of the chunk list pool;
• and
• fetching, by the metadata server, information on the available chunks from the chunk list pool,
• wherein when the chunk list pool has available chunks in a number of a number needed for a file storage request or more, in the fetching of the available chunk information, the available chunk information is fetched from the chunk list pool immediately upon a request of an external client for chunk information without requesting a data server to allocate the plurality of chunks.