Is fsck obsolet for journaling FS? - Was: How do I Automount [snip]

Robert Heller heller at deepsoft.com
Mon Nov 30 15:03:33 UTC 2015


At Mon, 30 Nov 2015 16:33:20 +0200 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> On Sun, Nov 29, 2015 at 10:03 PM, Robert Heller <heller at deepsoft.com> wrote:
> >
> > Actually, journaling file systems *do* require periodically fsck.  They just
> > don't need to run fsck everytime there is a 'crash' reboot (i.e. someone yanks
> > the power cord or presses the reset button or something like that).  Actually
> > fsck is the program that handles journal processing when mounting an 'unclean'
> > journaled file system, so yes fsck really is still used.
> 
> >From a clean install of a 16.04 VM where "/dev/sda1" is "/":
> 
> # tune2fs -l /dev/sda1 | grep -E 'Maximum|Check'
> Maximum mount count:      -1
> Check interval:           0 (<none>)
> #
> 
> So the Ubuntu d-i installation sets an ext4 filesystem not to be
> fsck'd after x number of mounts or y days/weeks/months by default.

Interesting set of defaults.  Note that this is also a VM and if Ubuntu's 
installer is clever enough to detect that it is a VM (not necessarily 
impossible), it might be a VM-specific check, esp. if the VM's file system is 
implemented as a *file* on an otherwise checked file system.

> 

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