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yendhe 03-14-2016 01:43 PM
Ext4 Filesystem
 
Why ext4 filesystem has on/off options for journaling and not for ext3 filesystem?







Thanks

Keruskerfuerst 03-14-2016 01:50 PM
Every modern filesystem has journal.
If the computer has to be switched off during operation, then the filesystem is inconsistent.

273 03-14-2016 02:02 PM
Probably because ext4 is the file system currently being developed and ext3 is redundant?

hydrurga 03-14-2016 02:22 PM
Why do you think ext3 doesn't have on/off support for journaling?

The COMPAT_HAS_JOURNAL flag is applicable to both ext3 and ext4.

More info on ext3, including its journal feature: https://en.wikipedia.org/wiki/Ext3

hydrurga 03-14-2016 02:49 PM
To add some info:

Code:
sudo tune2fs -O ^has_journal /dev/sdaxx
will turn off journaling for both ext3 and ext4 filesystems.

Code:
sudo tune2fs -O has_journal /dev/sdaxx
will turn it on again.

yendhe 03-16-2016 01:30 PM
Thank you for providing such useful information.


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