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

Jason Spears shadestalker at thatsmystapler.org
Mon Oct 19 18:11:01 UTC 2009

I'll risk heresy.

1. Remount existing drive as /data/d0
2. Add new drive with its own filesystem as /data/d1
3. Go back to where /data/d0 used to be mounted and create a pile of
symbolic links to /data/d?/*.(mpg|avi|mkv) or what have you.

Yes, it's trading one form of fiddly management for another, but the
symbolic links method doesn't have you futzing around trying to recover data
- you just know you're going to lose some and have to re-rip.  At least this
way there's a given amount of content unharmed and still online while you
get back what was lost.


On Sun, Oct 18, 2009 at 7:17 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
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