Re: Is EXT4 the right FS for > 16TB?

[Ric Wheeler]

On 12/19/2010 12:01 PM, Eric Sandeen wrote:
> On 12/19/10 10:53 AM, Justin Piszcz wrote:
> > Hi,
> >
> > Wow, there were no updates though after Eric's last comment..
> > Eric, have there been any improvements in the past 6 months?
> >
> > Or should one still steer clear from EXT4>  16TB?
> There is still no released e2fsprogs which supports>  16T for
> ext4, but testing of the not-released bits is welcomed...
> Ted says a 16T-capable version is coming soon.  There's still
> work to be done there, though.
>
> -Eric

I usually tend to point people towards XFS when you need something at greater 
than 16TB in size....

Good luck,

Ric

> > Justin.
> >
> > On Sun, 19 Dec 2010, Sandon Van Ness wrote:
> >
> > > Was it me (houkouonchi) on hard forum? I asked if>  16 TiB support was
> > > considered stable on here a while back:
> > >
> > > Is>16TB support considered stable?
> > >
> > > This was 6 months ago so maybe things have changed. The thread:
> > >
> > > http://kerneltrap.org/mailarchive/linux-ext4/2010/5/28/6884603/thread
> > >
> > > Luckily JFS fixed there userland utilities bug of not being able to
> > > handle>  32TiB very shortly after this and I ended up going that route
> > > and I have yet to have any data loss or problems on my JFS volume:
> > >
> > > root@dekabutsu: 08:32 AM :~# df -H /data
> > > Filesystem             Size   Used  Avail Use% Mounted on
> > > /dev/sdd1               36T    22T    15T  61% /data
> > > root@dekabutsu: 08:32 AM :~#
> > >
> > > At work with our hundreds/thousands of servers we will likely be going
> > > ext4 as we wont be using it on>16 TiB. I think its a huge improvement
> > > over ext3 but for my use JFS ended up being a better fit. I
> > > refuse/refused to go XFS.
> > >
> > > On 12/19/2010 03:52 AM, Justin Piszcz wrote:
> > > > Hi,
> > > >
> > > > I've read a lot of posts regarding people who setup RAID volumes of
> > > > and up to around 16TB and EXT4 is typically used.
> > > >
> > > > However, in various forums, people still ask what is the correct
> > > > filesystem for>  16TB?  I did read one post somewhere that stated the
> > > > ext4 developers did not recommend using ext4 for very large volumes,
> > > > is this still true?
> > > >
> > > > I am looking at creating a 43TB volume possibly in the near future and
> > > > I have used XFS in the past, which works well and would probably not
> > > > have any problem with it; however, I have bitten quite a number of
> > > > times by XFS bugs in the past several years, so I was curious, how
> > > > does EXT4 perform on larger volumes, e.g., 20TB?
> > > >
> > > > Are there any caveats / problems?
> > > >
> > > > Justin.
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