Corruption in Linux Due to Write Back Cache

Devices rely on Write Back method to fix slow performance issues because of slower RPM and seek-time Write Back Cache is a caching technique in which the modifications to the data in cache are not copied to cache source until completely essential. It is implemented on the hard drives to improve write performance. Through this method, the hard drive could signal the successful completion of writing process more rapidly than if this had to wait until data was entirely transferred to disk media.

Write back caching is available with several microprocessors including Intel. write back cache is extremely useful technique to improve write performance, but in some cases, like hardware failure and power failure, the write back cache memory does not get flushed out to the actual drive.

It may cause corruption of data. The completed writing operation creates several problems for journaled file systems, generally because they bank on knowing whether the write operation to the drive has finished or not. Journaled file system requires knowing that the log entry has made to the disk before allowing metadata to be written on the drive. When metadata has written to the drive, the transaction could effectively be deleted from log file and free up the log space.

Therefore, if write operations never make it to physical drive, the ordering is desecrated and the metadata and log could be lost, which results into the file system damage. File system is the most important data structure of a Linux system. It is extremely important to store and organize the data files and makes them easily accessible.

The operating system never directly interacts with the file physically. It just takes the reference from file system table and locates to the particular file. In case of file system corruption, the operating system could not find the reference of particular file and thus can not access it.

This whole scenario will lead to the inaccessibility of your precious data and finally the data loss. The data loss may harshly affect your business in terms of decreased revenue and market reputation, time and money.

In such catastrophic circumstances, the only thing you should think of is Linux data recovery. Data recovery Linux is the technique of retrieving your most valuable data from failed hard drive. Data recovery Linux is best possible through Linux recovery software. These software are capable of handling all of the logical data loss situations including file system corruption.