Subject: Re: newfs can't make filesystems over 1TB in size
To: Brian Buhrow <email@example.com>
From: Luke Mewburn <firstname.lastname@example.org>
Date: 12/07/2002 11:50:04
On Fri, Dec 06, 2002 at 10:14:54AM -0800, Brian Buhrow wrote:
| Hello Jaromir. According to the document you reference, the fragment
| size must only be 2K to create a 4TB filesystem. The filesystem I'm trying
| to create has a fragment size of 4K, and a block size of 16K. The problem
| seems to be in newfs itself. The variable llsize is taken to be the size
| of the filesystem, and llsize is a long long. However, the filesystem size
| is passed to mkfs() inside fssize, which is a signed 32-bit integer. I
| think here-in lies the problem.
The kernel uses daddr_t to access underlying disk sectors.
daddr_t == int32_t == 2^31.
With 512 byte (2^9) sectors, 2^9 x 2^31 == 2^40 == 1TB.
If I recall correctly, we don't cleanly support larger sectors yet.