PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Linux)

2.2.1 MDS(Meta-data Server)

The MDS is a server daemon that manages the meta-data of the GFS Shared File System and operates as a user process. Each file system has two processes: primary MDS and secondary MDS. Two or more nodes of those that constitute a file system are predefined as MDS nodes and MDS operates on one of these nodes. If not set specifically, the MDS nodes are only the two nodes of the primary and secondary MDS node.

The secondary MDS is used for standby and runs on a different node from the primary MDS.

The MDS uses multithreading in order to execute processing requests from AC in parallel.

The MDS has the following major functions:

• Token management
• Meta-data area management
• Update log area management
• File data area management
• File system free area management
• AC node management