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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I don’t know JFS. I can share the experience I had
just last week adding a drive for LVM and use of ext4.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have 2 servers, both running Fedora 11 and ext4 (not the boot partition,
those cannot be). The main one has a small boot drive for Linux and 4 1 TB
drives for data, configured Linux software RAID 5 (Myth is on this server).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The second server is older and its only purpose is to run BackupPC
to take care of the main server. All drives are LVM and ext4. I
recently added a 3<sup>rd</sup> drive to it. They are smaller drives, not
TB, but the procedure was simple and flawless – plug it in, create PV,
add to VG, and extend the LV space to consume the new drive’s space.
I am not aware that disk size has any problem, especially if it is a 64 bit
system.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mythtv-users-bounces@mythtv.org [mailto:mythtv-users-bounces@mythtv.org] <b>On
Behalf Of </b>David DeMan<br>
<b>Sent:</b> Sunday, October 18, 2009 6:24 PM<br>
<b>To:</b> Discussion about mythtv<br>
<b>Subject:</b> Re: [mythtv-users] filesystem choice for an 8TB logical drive.<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p>This is me just guesseing but that sounds like its a limit to online
resizing, which means resizing while its mounted. I don't think it should be an
issue if you resize it when its unmounted.<o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'>On Oct 18, 2009 5:17 PM,
"Greg Grotsky" <<a href="mailto:spikeygg@gmail.com">spikeygg@gmail.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal>To all interested,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I recently (two weeks ago) purchased a 2TB WD HDD from
Newegg. It was my wife's birthday present... she loves her movie
collection. I formatted it with jfs because I read lots of good
things about it's large file performance. I've been ripping DVDs steadily
and so far I'm ~270 down but the drive is getting full and I have about 75 to
go! Unfortunately, I don't have enough space to finish our
collection! Just today I purchased another 2TB drive and I'm planning on
building it into a 4TB LVM. Since I've already got 2TB of data
on one I have to:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>1) plug in the new drive.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>2) create a pv, vg, and lv on the new drive.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>3) copy all the movies from the jfs drive to the
new lv.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>4) wipe the partition info and create and LVM partition on
it.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>5) extend the new lv onto the old disk.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>6) extend the filesystem.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>(let me know if I'm missing anything here)<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Because of this I need to use a filesystem that can be
resized. I know that JFS can but I worry that it can not be shrunk (I'm
not sure why).<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>My questions are:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>1) Should I be worried that I cannot shrink JFS?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>2) Should I use another filesystem type because I cannot
shrink JFS, or for some other reason?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>3) I've read some things about ext4 which make it sound very
appealing. Has anyone had experience growing an ext4 fs to 4TB?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I want to be able to add much more space in the future, so I
don't want to be limited on resizing. I've been reading about ext4, and
apparently there is a 4TB soft limit on fs resizing; the article
below talks about some META_BG feature but I have no idea what that means.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><a
href="http://ext4.wiki.kernel.org/index.php/Frequently_Asked_Questions#How_to_online_resize_the_Ext4_filesystem.3F"
target="_blank">http://ext4.wiki.kernel.org/index.php/Frequently_Asked_Questions#How_to_online_resize_the_Ext4_filesystem.3F</a><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Thank you,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>-Greg<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='color:#888888'> <o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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target="_blank">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><o:p></o:p></p>
</blockquote>
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