FAILURE RECOVERY METHOD IN INFORMATION PROCESSING SYSTEM AND INFORMATION PROCESSING SYSTEM

• US 20150309891A1
• Filed: 04/24/2015
• Published: 10/29/2015
• Est. Priority Date: 12/14/2010
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: SAIKA, Nobuyuki
• Granted Patent: US 9,727,430 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/1417 Boot up procedures
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/1484 involving virtual machines
• CPC Class Codes: G06F 11/203 using migration
• CPC Class Codes: G06F 16/185 Hierarchical storage management [HSM] systems, e.g. file migration or policies thereof details of archiving G06F16/11
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: H04L 67/53 using third party service providers

Abstract

Services are promptly resumed at the time of a failure recovery in an information processing system. Before a first server system 3a resumes service during the failure recovery, a second server system 3b sends the first server system 3a directory images of directories of a highest-level tier to a predetermined lower-level tier out of data of files stored in a second storage apparatus 10b, and the first server system 3a restores the directory images in a first storage apparatus 10a. When the request is transmitted from the first server system 3a, the second server system 3b reads an additional directory image from the second storage apparatus 10b and transmits the additional directory image to the first server system 3a. If a re-stubbing occurrence frequency is equal to or higher than a predetermined threshold, the second server system 3b suppresses transmission of directory images to the first server system 3a.

Claims

1. A failure recovery method in an information processing system including

a first server system including a first file system and receiving a data I/O request, and;

a second server system including a second file system and being communicatively coupled to the first server system, wherein;

the first server system stores data of a file targeted by the data I/O request in a first storage apparatus;

the second server system stores the data of the file targeted by the data I/O request in a second storage apparatus;

the first server system transmits data of a file stored in the first storage apparatus to the second server system; and

the second server system stores the data transmitted from the first server system in the second storage apparatus, the method comprising;

the second server system sending to the first server system directory images of directories of a highest-level tier to a predetermined lower-level tier out of directory images stored in the second storage apparatus before the first server system starts receiving the data I/O request at the time of recovery from a failure;

the first server system, after restoring the directory images transmitted from the second server system in the first storage apparatus, resuming the reception of the data I/O request;

the first server system requesting the second server system for a directory image necessary for processing and receiving data I/O request when the directory image is not restored in the first storage apparatus after resumption of the reception of the data I/O;

the second server system reading the directory image from the second storage apparatus and transmitting the directory image to the first server system according to the request transmitted from the first server system; and

the first server system performing processing for the data I/O request based on the directory image transmitted from the second storage apparatus and restoring the directory image in the first storage apparatus.