公开(公告)号：US20140188953A1

公开(公告)日：2014-07-03

申请号：US13729256

申请日：2012-12-28

Applicant: HITACHI, LTD.

Inventor： Wujuan LIN ,  Kaushik MYSUR ,  Hirokazu IKEDA ,  Kenta SHINGA

IPC: G06F17/30

CPC classification number: G06F17/30203

Abstract: An aspect of the invention is directed to a plurality of MDSs (metadata servers) in a distributed storage system which includes data servers storing file contents, each MDS having a processor and a memory and storing file system metadata. Directories of a file system namespace are distributed to the MDSs through referral directories referring to real directories using hash value of inode number of each of the referral directories. During a process to create a directory in the file system namespace, a first MDS dynamically creates a referral directory in the first MDS, and creates a real directory in a second MDS, the referral directory in the first MDS referring to the real directory in the second MDS by maintaining location information of the real directory in the second MDS, the real directory in the second MDS containing the file system metadata for the directory in the file system namespace.

Abstract translation: 本发明的一个方面涉及分布式存储系统中的多个MDS（元数据服务器），其包括存储文件内容的数据服务器，每个MDS具有处理器和存储器并且存储文件系统元数据。 通过引用目录将文件系统命名空间的目录分发到MDS，引用目录使用每个引用目录的索引节点号的散列值。 在文件系统命名空间中创建目录的过程中，第一个MDS在第一个MDS中动态创建一个引用目录，并在第二个MDS中创建一个真实的目录，第一个MDS中的引用目录引用了 通过维护第二个MDS中的真实目录的位置信息来实现第二个MDS，第二个MDS中的真实目录包含文件系统命名空间中目录的文件系统元数据。