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03-04-2025
03:23 AM
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Journaling
Which Linux filesystems, in RHEL 9, support journaling?
Trevor "Red Hat Evangelist" Chandler
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03-04-2025
12:23 PM
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@Trevor both ext4 and XFS
journaling employ write handling by recording changes in a journal before applying them to the actual filesystem, where original data is subsequently overwritten. This process ensures data consistency by recording metadata changes and replaying them if necessary. Performance incurs minimal overhead, varying with the journaling mode, while space utilization remains efficient due to the journal's typical size being in megabytes. Recovery times are fast, as the journal can be replaced instantly. Notably, journaling itself does not provide built-in support for features such as compression or deduplication.
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