Je pense avoir trouvé comment désactiver la journalisation
J'ai trouvé ceci :
Data Mode
=========
There are 3 different data modes:
* writeback mode
In data=writeback mode, ext4 does not journal data at all. This mode provides a similar level of journaling as that of XFS, JFS, and ReiserFS in its default mode - metadata journaling. A crash+recovery can cause incorrect data to appear in files which were written shortly before the crash. This mode will typically provide the best ext4 performance.
* ordered mode
In data=ordered mode, ext4 only officially journals metadata, but it logically groups metadata information related to data changes with the data blocks into a single unit called a transaction. When it's time to write the new metadata out to disk, the associated data blocks are written first. In general, this mode performs slightly slower than writeback but significantly faster than journal mode.
* journal mode
data=journal mode provides full data and metadata journaling. All new data is written to the journal first, and then to its final location.
In the event of a crash, the journal can be replayed, bringing both data and
metadata into a consistent state. This mode is the slowest except when data
needs to be read from and written to disk at the same time where it outperforms all others modes. Curently ext4 does not have delayed allocation support if this data journalling mode is selected.
Il suffirait donc de monter le disque avec l'option
data=writeback
Comme ceci par exemple dans /etc/fstab
UUID=04cfdee9-af03-44c1-b313-71e328fa174e / ext4 data=writeback,errors=remount-ro 0 0
Rien de compliqué donc ! 😃 Les bidouilles précédentes étaient pour les anciens noyaux qui n'avaient pas encore complètement intégré le support d'ext4.
A ajouter dans la doc !!
