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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I was under the impression there was
little value in defragging a journaled filesystem. Even the commercial
Veritas Filesystem (vxfs) has a defrag method available but in the few times I’ve
decided it might be worthwhile to try defragging I’ve seen no real improvement
in the way the filesystem operated before and after the defrag.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
ale-bounces@ale.org [mailto:ale-bounces@ale.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Richard Faulkner<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, September 13, 2010
9:10 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Atlanta Linux Enthusiasts -
Yes! We run Linux!<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [ale] Ubuntu Linux
Defrag EXT4</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Okay...and for those who
are new to the GNU world (on this level)...me for one...<br>
<br>
Paul: You're doing a defrag operation on a mounted drive? I've done
this a billion times I swear on M$ but not Linux (don't feel a need to).
Am I correct in thinking that to do an actual defrag on Linux you need to
unmount the drive in question and do the operation from a bootable disc?
Am I reading this correctly that your doing a disk fragmentation check on a
mounted drive and it "no-likey" that because it is mounted?<br>
<br>
I'm headed out-of-town for a day so won't be checking the thread until my
return...this is getting interesting! (As things often do around here --
In a good way!) : )<br>
<br>
Cya'll when I get back! --Rich in Lilburn<br>
<br>
<br>
<br>
-----Original Message-----<br>
<b><span style='font-weight:bold'>From</span></b>: Paul Cartwright <<a
href="mailto:Paul%20Cartwright%20%3cale@pcartwright.com%3e">ale@pcartwright.com</a>><br>
<b><span style='font-weight:bold'>Reply-to</span></b>: <st1:City w:st="on"><st1:place
w:st="on">Atlanta</st1:place></st1:City> Linux Enthusiasts - Yes! We run
Linux! <ale@ale.org><br>
<b><span style='font-weight:bold'>To</span></b>: Atlanta Linux Enthusiasts -
Yes! We run Linux! <<a
href="mailto:Atlanta%20Linux%20Enthusiasts%20-%20Yes!%20We%20run%20Linux!%20%3cale@ale.org%3e">ale@ale.org</a>><br>
<b><span style='font-weight:bold'>Subject</span></b>: Re: [ale] Ubuntu Linux
Defrag EXT4<br>
<b><span style='font-weight:bold'>Date</span></b>: Mon, 13 Sep 2010 06:53:30
-0400<o:p></o:p></span></font></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>On Sun September 12 2010, Ed Cashin wrote:<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>> I found out recently that you can see exactly what's fragmentated<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>> with one command.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>> e2fsck -n -E fragcheck {device}<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>> I believe it works on ext4, but I haven't tried it.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>YIPES! works on ext3!<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>I good good news & bad news..<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>mount<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda6 on / type ext3 (rw,usrquota,grpquota,errors=remount-ro) <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda7 on /home type ext3 (rw)<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> #e2fsck -n -E fragcheck /dev/sda7<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>e2fsck 1.41.11 (14-Mar-2010)<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Warning! /dev/sda7 is mounted.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Warning: skipping journal recovery because doing a read-only filesystem check.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda7: clean, 274376/21872640 files, 30881155/43722897 blocks<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'># e2fsck -n -E fragcheck /dev/sda6<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>e2fsck 1.41.11 (14-Mar-2010)<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Warning! /dev/sda7 is mounted.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Warning: skipping journal recovery because doing a read-only filesystem check.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda7: clean, 274376/21872640 files, 30881155/43722897 blocks<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>(SKIP LOTS of lines...)<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Free blocks count wrong (1395294, counted=1395257).<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Fix? no<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Inode bitmap <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>differences: -98843 -771568 -902896 -(902899--902900) -902965 -904492 -(904551--904555) -(904557--904558) -922016 -922018 -925348 -(925354--925355) -952787 -968546 -968973 -968975 -(969647--969648) -(969650--969651) -1625307 -1625323 -1625553 -1626351 -1626358 -1626361 -1626409 -1855116 -1855359 -1856395 -2019692 -2021651 -2216788 -2217096 -2217264 -2217294 -2217495 -2217572 -2217736 -2217803 -2217897 -2218290 -2218474 -2218500 -2282147 -2287055 -2299185 -2299205<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Fix? no<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Free inodes count wrong for group #55 (8466, counted=8464).<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Fix? no<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Free inodes count wrong for group #56 (10358, counted=10359).<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Fix? no<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Directories count wrong for group #58 (39, counted=38).<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Fix? no<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda6: ********** WARNING: Filesystem still has errors **********<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>/dev/sda6: 521067/2626560 files (6.7% non-contiguous), 3847586/5242880 blocks<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>## uptime<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> 06:52:41 up 28 days, 44 min, 7 users, load average: 0.03, 0.24, 0.27<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>so, after you do the fsck fragcheck... and it fails...<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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