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Re: [Linux-cluster] defragmentation.....



This is interesting too. note the variation in extents (the file is a piece of marketing fluff, name is unimportant)


$ df -h .
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroupBeast03-LogVolUser1
                      250G  113G  138G  45% /stage/user1

$ ls -l SUMO-SATA-Competitive-Positioning-v1.ppt
-rw-r--r-- 1 ajb2 computing 3746304 Nov 8 2007 SUMO-SATA-Competitive-Positioning-v1.ppt

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new

$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 153 extents found

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 73 extents found

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 12 extents found

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 16 extents found

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 9 extents found

$ rsync SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 16 extents found

$ cp SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
cp: overwrite `SUMO-SATA-Competitive-Positioning-v1.ppt.new'? y
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 5 extents found

$ cp SUMO-SATA-Competitive-Positioning-v1.ppt SUMO-SATA-Competitive-Positioning-v1.ppt.new
cp: overwrite `SUMO-SATA-Competitive-Positioning-v1.ppt.new'? y
$ filefrag SUMO-SATA-Competitive-Positioning-v1.ppt*
SUMO-SATA-Competitive-Positioning-v1.ppt: 915 extents found
SUMO-SATA-Competitive-Positioning-v1.ppt.new: 16 extents found

All these commands were executed in a 30 second period.




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