Kyoto University of Japan lost 77TB of important data due to Hewlett Packard Japan supercomputer-

Kyoto University of Japan yesterday issued a statement saying that from December 14-16, their supercomputer’s backup system accidentally deleted a large amount of data. And it seems that they lost data because of the computer made by Hewlett Packard Japan (HP). The university lost approximately 34 million files.

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The official statement reads as follows:

From 5:32 p.m. on December 14, 2021 to 12:43 p.m. on December 16, 2021, due to a defect in the program that backs up the storage of the supercomputer system (manufactured by Japan Hewlett Packard LLC), the supercomputer system has grown large. A crash has occurred in which some data in the storage capacity (/ LARGE0) has been inadvertently deleted.

We sincerely apologize for the inconvenience caused.

We will continue to work to prevent such a situation from happening again so that such a situation does not happen again in the future. Thanks for understanding.

Influence range of file loss

  • Target file system: / LARGE0
  • File deletion period: December 14, 2021 5:32 p.m. – December 16, 2021 12:43 p.m.
  • File target for disappearance: December 3, 2021, 5:32 PM or later, Files that have not been updated
  • Lost file capacity: approximately 77TB
  • Number of lost files: About 34 million files
  • Number of affected groups: 14 groups (including 4 groups that cannot be restored by backup)

Failure Information: [Supercomputer] Loss of storage data

Causes of lost files

The backup log of the past was originally useless due to a problem of careless modification of the program and its application procedure in the functional repair of the backup program by Japan Hewlett Packard GK, the supercomputer system supplier . The file deletion process malfunctioned like the file deletion process under the / LARGE0 directory.

Report submitted by Hewlett-Packard Japan is published.

What will we do in the future?

The backup process is currently stopped. But we plan to resume backup by the end of January after improving the program problem and taking steps to prevent a recurrence.

Since it has become impossible to restore the files to the area where the backup was performed after the files disappeared, in the future we will implement not only the mirroring backup, but also an improvement such as leave incremental backup for a while. We will work to improve not only functionality but also operations management to avoid a recurrence.

On the other hand, it is difficult to take comprehensive measures including the possibility of loss of files due to equipment failure or disaster. So even if you are ordinary user, please backup important files to other system.

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