Robert Moonen <[email protected]> writes:
> Ext3/4 filesystems do not need defragmenting like FAT32 and friends
Wrong. Under pathological cases, ext will get fragmented quickly:
specifically, if you repeatedly fill the filesystem as root, or as any
user with the reserved space set to 0. After a couple of dozen times,
fsck will report a fragmentation level of 30% or so.
The fix for this is in userspace: free up some space, then for each file
on the filesystem, read it out and write it back. Something like *untested)
find /foo -xdev -type f -exec sh -c 'cp "$0" "$0~" && mv "$0~" "$0"' {} \;
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