Linux Tip of the Day - Why mv is slow
mv command across filesystems is slower on large files
WHY?
mv would be slow if you are moving files across filesystem.
The inode number changes only when a file is moved across file system.
A new inode number means a new file is physically created on disk.
It remains unchanged, if it is within the same filesystem. One can verify by using ls -il command on that file.
mv uses rename() system call. if it fails, it uses copy routine (basicailly reads from a file and writes in another file).
mv command across filesystem is more of a copy then mv.
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