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Full Discussion: Power failure: file damage?
Top Forums UNIX for Dummies Questions & Answers Power failure: file damage? Post 302895040 by bakunin on Friday 28th of March 2014 10:06:33 AM
Old 03-28-2014
Quote:
Originally Posted by raylier
But is it possible that there are damaged files I don't know of but can cause trouble later on?
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
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GIT-LOST-FOUND(1)						    Git Manual							 GIT-LOST-FOUND(1)

NAME
git-lost-found - Recover lost refs that luckily have not yet been pruned SYNOPSIS
git lost-found DESCRIPTION
NOTE: this command is deprecated. Use git-fsck(1) with the option --lost-found instead. Finds dangling commits and tags from the object database, and creates refs to them in the .git/lost-found/ directory. Commits and tags that dereference to commits are stored in .git/lost-found/commit, and other objects are stored in .git/lost-found/other. OUTPUT
Prints to standard output the object names and one-line descriptions of any commits or tags found. EXAMPLE
Suppose you run git tag -f and mistype the tag to overwrite. The ref to your tag is overwritten, but until you run git prune, the tag itself is still there. $ git lost-found [1ef2b196d909eed523d4f3c9bf54b78cdd6843c6] GIT 0.99.9c ... Also you can use gitk to browse how any tags found relate to each other. $ gitk $(cd .git/lost-found/commit && echo ??*) After making sure you know which the object is the tag you are looking for, you can reconnect it to your regular refs hierarchy by using the update-ref command. $ git cat-file -t 1ef2b196 tag $ git cat-file tag 1ef2b196 object fa41bbce8e38c67a218415de6cfa510c7e50032a type commit tag v0.99.9c tagger Junio C Hamano <junkio@cox.net> 1131059594 -0800 GIT 0.99.9c This contains the following changes from the "master" branch, since ... $ git update-ref refs/tags/not-lost-anymore 1ef2b196 $ git rev-parse not-lost-anymore 1ef2b196d909eed523d4f3c9bf54b78cdd6843c6 GIT
Part of the git(1) suite Git 1.8.5.3 01/14/2014 GIT-LOST-FOUND(1)
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