linux-ext4 - Re: EXT4 Larger Than 16TB

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Date:	Sun, 21 Jul 2013 19:59:27 -0500
From:	Michael <mike@...ftx.net>
To:	Michael <mike@...ftx.net>, "H. Peter Anvin" <hpa@...or.com>,
	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: EXT4 Larger Than 16TB

Thank you for your help. Unfortunately, it didn't give me the answer I
had hoped for. Darn!

--
tune2fs 1.42.5 (29-Jul-2012)
Filesystem volume name:   <none>
Last mounted on:          /mnt/dataRaid
Filesystem UUID:          60171591-358c-4b6a-9b29-684c1b964aa8
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index
filetype needs_recovery extent 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:              503316480
Block count:              4026531840
Reserved block count:     201326591
Free blocks:              1301052106
Free inodes:              502075987
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      64
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         4096
Inode blocks per group:   256
RAID stride:              128
RAID stripe width:        512
Flex block group size:    16
Filesystem created:       Fri Dec  7 01:00:01 2012
Last mount time:          Tue Jul 16 21:09:31 2013
Last write time:          Tue Jul 16 21:09:31 2013
Mount count:              2
Maximum mount count:      -1
Last checked:             Mon Jul  8 15:21:15 2013
Check interval:           0 (<none>)
Lifetime writes:          9 TB
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:      62024c47-022f-448e-a697-e3fb4ed618f3
Journal backup:           inode blocks

On Sun, Jul 21, 2013 at 7:52 PM, Zheng Liu <gnehzuil.liu@...il.com> wrote:
> 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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