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Checkpointing computer system having duplicated files for executing process and method for managing the duplicated files for restoring the process
Checkpointing computer system having duplicated files for executing process and method for managing the duplicated files for restoring the process
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机译:具有用于执行过程的重复文件的检查点计算机系统以及用于管理用于恢复过程的重复文件的方法
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摘要
A computer system which can achieve rollback operation when a fault occurs in the system without waiting for side-tracking of pre- update data during updating of a file. When a file write request has been made, "file writing information" pertaining to the file write is saved in a pending queue and only a primary file is immediately updated. After a checkpoint has been acquired, the "file writing information" saved in the pending queue is shifted to a confirmed queue, and is then written to a back-up file. When performing recovery, all pre-update data which corresponds to the data which has been updated since the last checkpoint acquired is read from the back-up file, based on the "file writing information" saved in the pending queue. The primary file is then restored to its state at the checkpoint time by using the pre- update data which has been read from the backup file.
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