公开(公告)号：JPH09204338A

公开(公告)日：1997-08-05

申请号：JP888396

申请日：1996-01-23

Applicant: TANDEM COMPUTERS INC

Inventor： JIEEMUZU EI RAIAN ,  SUTEIIBUN AARU PIASON ,  FURANKO PUTSUTOZORU

IPC: G06F12/00

Abstract: PROBLEM TO BE SOLVED: To speed up the restoration of fault in a data processing system by scanning an interrupted operation record backward from a common log at the time of the occurrence of fault and writing a corresponding compensation log entry forward in the common log. SOLUTION: The common log is formed by the log synthesis of an independent resource manager. During restoring processing, this log is scanned in backward order, and a count value is increased and the entry of the compensation log is written forward in the log for every compensation operation. When the count value becomes equal to a present value, a next AND record is written forward in the log including the record-id of the present log record in the middle of compensation. Until the recode provided with record-id in the middle of next AND recording, all the record is neglected. Consequently, the entry of the compensation log of a next ANDed record within the log is neglected to prevent exceeding AND processing.

公开(公告)号：JPH09204340A

公开(公告)日：1997-08-05

申请号：JP877596

申请日：1996-01-23

Applicant: TANDEM COMPUTERS INC

Inventor： MAIKERU JIEI SUKAAPEROSU ,  ROBAATO FUAN DERU RINDEN ,  UIRIAMU JIEI KAAREI ,  JIEEMUZU EI RAIAN ,  MASHIYUU SHII MATSUKURIIN

IPC: G06F11/34 ,  G06F12/00

Abstract: PROBLEM TO BE SOLVED: To utilize a stored audit trace file for restoring on-line by enabling an audit trail constitution control processor to control the generation, renaming and erasing of the audit trace file on an audit trace disk storage device. SOLUTION: Both of a data disk processor 200 and the audit trace constitution control processor 220 generate an audit record so as to allow restoration to a consistent state in case of a fault. Primary and backup ADP controls the access of a disk volume storing the audit trace file. Primary ADP is normally provided with the control of disk access but in case of a fault, it is replaced with backup. In order to allow this taking over, primary ADP sends a periodical check point to the backup including all disk state information necessary for smooth taking over. These processings mutually work by exchanging messages through a messaging system 222.

公开(公告)号：JPH08263356A

公开(公告)日：1996-10-11

申请号：JP888496

申请日：1996-01-23

Applicant: TANDEM COMPUTERS INC

Inventor： UIRIAMU JIEI KAAREI ,  JIEEMUZU EI RAIAN ,  MASHIYUU SHII MATSUKURIIN ,  MAIKERU JIEI SUKAAPEROSU

IPC: G06F12/00 ,  G06F1/00 ,  G06F21/00 ,  G06F21/24

Abstract: PROBLEM TO BE SOLVED: To provide a method for limiting alteration access to a reserve sub volume only to an application process requiring to perform such access. SOLUTION: System critical files are protected so as not to be altered or eliminated by carelessness by placing them in the reserve name space of a storage device and requiring a process requesting the alteration access to the reserve name space to be provided with a right to do so. The right to the alteration access is acquired by the process of calling a system library processing procedure for altering a memory storage data structure relating to the called process first and identifying that the process is provided with the right to perform the alteration access to the reserve name space. A trial for altering, eliminating or preparing the file present in the reserve name space is denied without such a right.