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UGU: Unix Guru Universe - Unix Tip #4447- May 15, 2019 - Home : Help : Today's Tip
Unix Tip #4447- May 15, 2019

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.


This tip generously supported by: dkotian1@rediffmail.com

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


LAST 5 TIPS
4446 - ECHO LINES TO A BLANK
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