STORAGE SYSTEM AND DATA ACCESS METHOD

摘要

A distributed storage system which achieves high access performance simultaneously with maintaining the flexibility of allocation of data objects is disclosed. A client terminal includes an asynchronous cache that retains an correspondence relationship between an identifier of object data and an identifier of the storage node that is to handle an access request for the object data, and an access unit that determines the storage node that is to handle the access request on the basis of the correspondence relationship stored in the asynchronous cache, and that transmits the access request to the determined storage node, wherein the storage node includes a determination unit that determines, upon receiving the access request from the client terminal, whether the access request is to be handled by itself, and notifies the client terminal of the determined result, and an update unit that updates the storage node that is to handle the access request, and wherein the asynchronous cache changes the correspondence relationship in accordance with the update, the change being made asynchronous with the update by the storage nodes.

主权项

1. A storage system comprising:
a client terminal; and a plurality of storage nodes,
wherein the client terminal includes an asynchronous cache that retains an correspondence relationship between an identifier of object data and an identifier of the storage node that is to handle an access request for the object data, and an access unit that determines the storage node that is to handle the access request on the basis of the correspondence relationship stored in the asynchronous cache, and that transmits the access request to the determined storage node,wherein the storage node includes a determination unit that determines, upon receiving the access request from the client terminal, whether the access request is to be handled by itself, and notifies the client terminal of the determined result, and an update unit that updates the storage node that is to handle the access request, andwherein the asynchronous cache changes the correspondence relationship in accordance with the update, the change being made asynchronous with the update by the storage nodes.