Re: Help with space

Chris Murphy
2014-02-27T19:27:35Z

On Feb 27, 2014, at 11:19 AM, Justin Brown <otakujunction@gmail.com> wrote:

> I've a 18 tera hardware raid 5 (areca ARC-1170 w/ 8 3 gig drives) in
> need of help. Disk usage (du) shows 13 tera allocated yet strangely
> enough df shows approx. 780 gigs are free. It seems, somehow, btrfs
> has eaten roughly 4 tera internally. I've run a scrub and a balance
> usage=5 with no success, in fact I lost about 20 gigs after the
> balance attempt. Some numbers:
>
> terra:/var/lib/nobody/fs/ubfterra # uname -a
> Linux terra 3.12.4-2.44-desktop #1 SMP PREEMPT Mon Dec 9 03:14:51 CST
> 2013 i686 i686 i386 GNU/Linux

This is on i686?

The kernel page cache is limited to 16TB on i686, so effectively your block device is limited to 16TB. While the file system successfully creates, I think it's a bug that the mount -t btrfs command is probably a btrfs bug.

The way this works for XFS and ext4 is mount fails.

EXT4-fs (sdc): filesystem too large to mount safely on this system
XFS (sdc): file system too large to be mounted on this system.

If you're on a 32-bit OS, the file system might be toast, I'm not really sure. But I'd immediately stop using it and only use 64-bit OS for file systems of this size.

Chris Murphy