Which file system characteristic helps protect data integrity by recording intended changes in a dedicated log so the system can be quickly restored after a crash or power failure?
Journaling file systems write the details or "intent" of each change to a special log (the journal) before committing the change to the main file system structures. If the system loses power or crashes mid-operation, the OS replays or rolls back the journal on reboot, bringing the file system back to a consistent state and greatly reducing the chance of corruption. Compression, fragmentation, and disk mirroring do not provide this transaction-style recovery capability.
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What are some common file systems that use journaling?
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How does journaling differ from traditional file systems?
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What are the types of journaling methods used in file systems?