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The smallest possible allocation size for a file in ext3/ext4 is 0 (none at all) because of inline data: files with sizes smaller than 60 bytes can be stores completely inside the inode itself. Of course, every file, whether it's a regular file, symlink, directory (which can contain data), or character device or block device or named pipe (none of which ...


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tune2fs -l <filesystem> was what I was looking for. I wrote a command to quickly check the filesystem state for all mounted filesystems: df | awk '/^\/dev/ {print $1}' | xargs -I {} sh -c 'echo {}; tune2fs -l {}' | awk '/^\/dev/ {print $1} /^Filesystem state/ {print $3, " ",$4}'


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As jordanm says, tune2fs -l /dev/... should say Filesystem state: clean (even for a mounted filesystem). I'm not entirely sure whether that's guaranteed though. You definitely don't want Filesystem state: with errors; as long as it doesn't say that you should be OK. If your filesystems are built on logical volumes (with LVM), and you have some spare ...



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