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Date:	Wed, 12 Nov 2008 13:25:38 -0700
From:	Andreas Dilger <>
To:	"Theodore Ts'o" <>
	Valerie Aurora Henson <>
Subject: Re: [RFC,PATCH] 64-bit support for e2fsprogs

On Nov 11, 2008  19:42 -0800, Valerie Aurora Henson wrote:
> Use the following mke2fs command to produce a file system with more
> than 2^32 blocks:
> $ mke2fs -t ext4 -O 64bit -b 4096 -N 200000 <device>

Ted, this actually exposes a bug in mke2fs, in that the device size to
"type" detection code is broken.  Val was reporting that running on a
16TB device would pick the "floppy" type and try to use 1024-byte blocks
and 1 inode per 1024 bytes, which would exceed the 2^32 inode limit.
Hence the current requirement to specify a 4096-byte blocksize and a
hard limit on the number of inodes.

Cheers, Andreas
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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