Power failure: file damage? Post: 302895048

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Top Forums UNIX for Dummies Questions & Answers Power failure: file damage? Post 302895048 by raylier on Friday 28th of March 2014 10:26:50 AM

03-28-2014

Registered User

Quote:

Originally Posted by bakunin

Yes, there is a very remote chance of that having happened, but it is not at all likely.

Most Unix systems today use a "journaling filesystem" of some sort or other and these are quite robust when it comes to unexpected power loss.

At the startup a system will notice that a filesystem was not properly closed during the shutdown before in such a case and initiate a filesystem check. While older FSes would have a (ever diminishing) chance of such a check not being successful (SUNs sfs, for instance, was famous for the high rate of this happening) or some files being beyond repair modern FSes - and especially journaling FSes - run a very low risk in this regard. Usually you see something like "replaying log" during startup and the time that takes is barely noticeable.

I hope this helps.

bakunin

Thanks. I wil run a fsck manually....

raylier

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LEARN ABOUT NETBSD

fsck_msdos

FSCK_MSDOS(8)						    BSD System Manager's Manual 					     FSCK_MSDOS(8)

NAME

     fsck_msdos -- DOS/Windows (FAT) filesystem consistency checker

SYNOPSIS

     fsck_msdos -p [-f] filesystem ...
     fsck_msdos [-fny] [-x snap-backup] filesystem ...

DESCRIPTION

     The fsck_msdos utility verifies and repairs FAT filesystems (more commonly known as DOS filesystems).

     The first form of fsck_msdos preens the specified filesystems.  It is normally started by fsck(8) run from /etc/rc during automatic reboot,
     when a FAT filesystem is detected.  When preening file systems, fsck_msdos will fix common inconsistencies non-interactively.  If more seri-
     ous problems are found, fsck_msdos does not try to fix them, indicates that it was not successful, and exits.

     The second form of fsck_msdos checks the specified file systems and tries to repair all detected inconsistencies, requesting confirmation
     before making any changes.

     The options are as follows:

     -f 	       This option is ignored by fsck_msdos, and is present only for compatibility with programs that check other file system
		       types for consistency, such as fsck_ffs(8).

     -n 	       Causes fsck_msdos to assume no as the answer to all operator questions, except ``CONTINUE?''.

     -p 	       Preen the specified filesystems.

     -x snap-backup    Use a snapshot with snap-backup as backup to check a read-write mounted filesystem.  Must be used with -n.  See fss(4) for
		       more details.  The point is to check an internally-consistent version of the filesystem to find out if it is damaged; on
		       failure one should unmount the filesystem and repair it.

     -y 	       Causes fsck_msdos to assume yes as the answer to all operator questions.

SEE ALSO

     fss(4), fsck(8), fsck_ffs(8), mount_msdos(8)

BUGS

     fsck_msdos is still under construction.

BSD
								  April 11, 2010							       BSD