[mythtv-users] filesystem choice for an 8TB logical drive.

[David DeMan]

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.

On Oct 18, 2009 5:17 PM, "Greg Grotsky" <spikeygg at gmail.com> wrote:

To all interested,

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:

1) plug in the new drive.
2) create a pv, vg, and lv on the new drive.
3) copy all the movies from the jfs drive to the new lv.
4) wipe the partition info and create and LVM partition on it.
5) extend the new lv onto the old disk.
6) extend the filesystem.
(let me know if I'm missing anything here)

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).

My questions are:
1) Should I be worried that I cannot shrink JFS?
2) Should I use another filesystem type because I cannot shrink JFS, or for
some other reason?
3) I've read some things about ext4 which make it sound very appealing.  Has
anyone had experience growing an ext4 fs to 4TB?

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.
http://ext4.wiki.kernel.org/index.php/Frequently_Asked_Questions#How_to_online_resize_the_Ext4_filesystem.3F

Thank you,
-Greg


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