Data recovery scheme for data loss after FSCK based on Linux system

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I. GENERAL statement: based on Linux System, fsck Data recovery scheme after data loss

Second, the solution

2.1 Recovery Process

2.1.1 Inspection Process

1 , detect hardware failure, such as hardware failure, turn hardware processing
2, read-only detection of fault performance is the same as user description

2.1.2 Recovery Process

1 , Backup: Full mirroring of failed disks in read-only mode ( See appendix )
2, if you need to restore the full directory structure, the first need to fully recover the lost file node, and then restore data. If the node cannot be recovered, it can be recovered by file type.
3.The recovered data is temporarily present on another storage body

2.1.3 Acceptance Process

verify the recovered data and verify its correctness. If confirmed, pay-- and transfer the original media and recovered data -- issue an invoice ( receipt ) and reports. If unable to confirm or not confirm, transfer the original media does not charge the service charge, can produce the report for free.

Third, the possibility of data recovery

fsck verifies the matching relationship between the file system nodes, the data indexes, and fixes attempts to regenerate the file system tree and to consistently align the relationship between the nodes and the index, and when the file system structure is inconsistent, it takes up new space to generate a consistent metadata structure, which sometimes destroys the recovery site, Makes data recovery more difficult or impossible to complete.

fsck If there are a large number of nodes error and prompt has been repaired, this damage is very serious, data recovery will be very difficult. The directory structure and file name are the most vulnerable, which can cause the recovered data to completely lose the original directory structure and file name.

fsck after execution, if completed in a short time, the likelihood of data recovery is high regardless of the result of the repair.

Iv. time required for data recovery

There are many factors that affect the time of data recovery. In general, data recovery services take approximately 2-3 days and are subject to availability in complex situations.

Six, tips

1 , storage devices do not have 100% security assurances, important data needs to be backed up often, and data synchronization tools can be used to back up backups.

2 , in the event of a data disaster, the machine should not have any further action, if conditions, should be the hard disk or other storage media full image (see appendix)

3 , data deletion, even if not write data, simple reading can easily destroy the file system log, so, after the failure, should be as soon as possible Umount file System.

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Data recovery scheme for data loss after FSCK based on Linux system