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Full Discussion: fsck on a mounted file system?
Top Forums UNIX for Dummies Questions & Answers fsck on a mounted file system? Post 89857 by Perderabo on Wednesday 16th of November 2005 10:39:04 AM
Old 11-16-2005
If fsck changes nothing, it can do no damage. Normally I use -n to prohibit fsck from changing stuff, but the Solaris man page says -N works too. So it is not dangerous. How useful it is on a mounted filesystem varies. It depends on how busy the filesystem is. I would do a "sync" first (although I think that fsck does its own sync).

Your original message would bother me enough to unmount the filesystem and then do an fsck on it. When I suspect trouble, even with an unmounted filesystem, I do a -n first. Too many times I have run an interactive fsck and been stuck typing y a few hundred times. With -n, I can gauge how many and how severe the errors are. Then I can decide if my next step is fsck, fsck -y, or newfs.
 

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LEARN ABOUT CENTOS

systemd-fsck

SYSTEMD-FSCK@.SERVICE(8)				       systemd-fsck@.service					  SYSTEMD-FSCK@.SERVICE(8)

NAME

       systemd-fsck@.service, systemd-fsck-root.service, systemd-fsck - File system checker logic

SYNOPSIS

       systemd-fsck@.service

       systemd-fsck-root.service

       /usr/lib/systemd/systemd-fsck

DESCRIPTION

       systemd-fsck@.service is a service responsible for file system checks. It is instantiated for each device that requires a file system
       check.  systemd-fsck-root.service is responsible for file system checks on the root file system. The root file system check is performed
       before the other file systems. Either service is enabled at boot if passno in /etc/fstab for the filesystem is set to a value greater than
       zero.

       systemd-fsck will forward file system checking progress to the console. If a file system check fails, emergency mode is activated, by
       isolating to emergency.target.

KERNEL COMMAND LINE

       systemd-fsck understands one kernel command line parameter:

       fsck.mode=
	   One of "auto", "force", "skip". Controls the mode of operation. The default is "auto", and ensures that file system checks are done
	   when the file system checker deems them necessary.  "force" unconditionally results in full file system checks.  "skip" skips any file
	   system checks.

SEE ALSO

       systemd(1), fsck(8), systemd-quotacheck.service(8)

systemd 208														  SYSTEMD-FSCK@.SERVICE(8)
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