Recording medium storing failure isolation processing program, failure node isolation method, and storage system

A failure node isolation method provided for a storage system in which data is distributed and stored in a plurality of storage devices so that when a failure occurs in at least one computer, of one or more computers, managing a real data storage area of the storage device, the at least one computer is isolated, the program comprising:

• assigning each of a plurality slices, obtained by dividing the real data storage area of the storage device by segments, to each of a plurality of segments obtained by dividing a virtual logical volume into a primary slice storing data of the respective segment as a destination of access made by an access node and a secondary slice that mirrors and stores data of the primary slice;
• storing management information associating each segment with the respective primary slice and the respective secondary slice in a recording unit;
• processing an access request transmitted from the access node based on the management information;
• monitoring a survival signal transmitted at predetermined intervals while the at least one computer is normally operating and detecting the at least one computer from which the survival signal is not detected over a predetermined time period as a failure node;
• and
• checking the failure node against the management information and setting a slice to be managed as a single primary slice that is an access destination of the access node and for which the mirroring is stopped when the slice to be managed is associated with the slice managed by the failure node, and isolating the failure node.

A storage system in which data is distributed and stored in a plurality of storage devices, the system comprising:

• a plurality of storage nodes each comprising:
• a recording unit in which each of a plurality of slices, obtained by dividing a real data storage area of the respective storage device by segments, is assigned to each of a plurality of segments obtained by dividing a virtual logical volume into a primary slice storing data of the respective segment as a destination of access made by an access node and a secondary slice that mirrors and stores data of the primary slice, management information associating each segment with the respective primary slice and the respective secondary slice being stored;
• an access processing unit configured to process an access request transmitted from the access node based on the management information;
• a failure node detecting unit that monitors a survival signal transmitted at predetermined intervals while the at least one computer is normally operating and detects the at least one computer from which the survival signal is not detected over a predetermined time period as a failure node;
• and
• a failure node isolation unit configured to check the failure node against the management information and set a slice to be managed as a single primary slice that is an access destination of the access node and for which the mirroring is stopped, and isolate the failure node when the slice to be managed is associated with the slice managed by the failure node, wherein
• the access node is configured to acquire the management information from the storage node, determine the storage node of an access destination based on the management information, and issue an access request to the determined storage node.