linux-ext4 - Re: EXT4 Larger Than 16TB

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Date:	Mon, 22 Jul 2013 08:52:27 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Michael <mike@...ftx.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
	linux-ext4@...r.kernel.org
Subject: Re: EXT4 Larger Than 16TB

Hi Michael,

On Sun, Jul 21, 2013 at 07:44:12PM -0500, Michael wrote:
> Also, in /etc/mke2fs.conf(Ubuntu has this by default):
>         ext4 = {
>                 features =
> has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
>                 auto_64-bit_support = 1
>                 inode_size = 256
>         }
> 
>         ext4dev = {
>                 features =
> has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
>                 inode_size = 256
>                 options = test_fs=1
>         }
> 
> 
> 
> Also, any info on how to find out if my fs is 64 bit or not? I don't
> know what this config was back when I made the system.

You could use 'tune2fs -l ${DEV}' to check whether 64bit feature is
enabled.  Here is a sample result:

$ sudo tune2fs -l /dev/sda1
tune2fs 1.43-WIP (21-Jan-2013)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          5abc13bd-01d9-41ff-b7ca-a028b3d610f8
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index
filetype extent 64bit flex_bg sparse_super large_file huge_file
                ^^^^^

uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              5021696
Block count:              20081242
Reserved block count:     1004062
Free blocks:              19719931
Free inodes:              5021685
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Mon Jul 22 08:50:15 2013
Last mount time:          n/a
Last write time:          Mon Jul 22 08:50:25 2013
Mount count:              0
Maximum mount count:      -1
Last checked:             Mon Jul 22 08:50:15 2013
Check interval:           0 (<none>)
Lifetime writes:          1358 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      7d9a465d-3e37-4d41-af45-fff9c682f8ec
Journal backup:           inode blocks

Regards,
                                                - Zheng
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