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A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the goal of such changes in a data ...
Journaling may refer to: Electronic message journaling , tracking and retention of electronic communications Journaling file system , a technique in computer file systems to prevent corruption
For real-time journaling, the journal message is sent for further processing at the same time the actual electronic message is being sent. For periodic journaling, the journal message is stored in a secure, local storage area before being archived at the enterprise level on a periodic basis, typically after business hours.
JFS is a journaling file system. Rather than adding journaling as an add-on feature like in the ext3 file system, it was implemented from the start. The journal can be up to 128 MB. JFS journals metadata only, which means that metadata will remain consistent but user files may be corrupted after a crash or power loss.
NT File System (NTFS) (commonly called New Technology File System) is a proprietary journaling file system developed by Microsoft in the 1990s. [ 11 ] [ 12 ] [ 2 ] It was developed to overcome scalability, security and other limitations with FAT . [ 13 ]
XFS is a high-performance 64-bit journaling file system created by Silicon Graphics, Inc (SGI) in 1993. [7] It was the default file system in SGI's IRIX operating system starting with its version 5.3.
ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. [4]
Using journals is the second simplest persistence technique. Journaling is the process of storing events in a log before each one is applied to a system. Such logs are called journals. On startup, the journal is read and each event is reapplied to the system, avoiding data loss in the case of system failure or shutdown.