[CentOS] Redhat vs centos vs ubuntu

[Reindl Harald]

Am 11.11.2011 14:01, schrieb John Hodrien:
> On Fri, 11 Nov 2011, Reindl Harald wrote:
> 
>> so tell me why i do not need GRUB2 for this more than a year?
>>
>> 2.6.40.8-4.fc15.x86_64 #1 SMP Tue Nov 1 18:17:12 UTC 2011
>>
>> /dev/md1      ext4     29G  8,0G   21G  28% /
>> /dev/md0      ext4    485M   52M  429M  11% /boot
>> /dev/md2      ext4    3,6T  602G  3,0T  17% /mnt/data
> 
> Presumably because ext4 is backwards compatible to ext3 grub didn't even
> notice the change...

IT IS NOT BACKWARD-COMPATIBLE
try to mount native ext4 (extent) with ext3-driver and you will see it

native ext4 is default for /boot since a long time
https://bugzilla.redhat.com/show_bug.cgi?id=486284

tune2fs 1.41.14 (22-Dec-2010)
Filesystem volume name:   boot
Last mounted on:          /boot
Filesystem UUID:          1de836e4-e97c-43ee-b65c-400b0c29d3aa
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 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:              128016
Block count:              511988
Reserved block count:     4096
Free blocks:              443096
Free inodes:              127933
First block:              1
Block size:               1024
Fragment size:            1024
Reserved GDT blocks:      256
Blocks per group:         8192
Fragments per group:      8192
Inodes per group:         2032
Inode blocks per group:   254
Flex block group size:    16
Filesystem created:       Wed Jun  8 13:10:48 2011
Last mount time:          Fri Nov 11 13:34:40 2011
Last write time:          Fri Nov 11 13:34:40 2011
Mount count:              20
Maximum mount count:      -1
Last checked:             Tue Oct 25 18:28:00 2011
Check interval:           2592000 (1 month)
Next check after:         Thu Nov 24 17:28:00 2011
Lifetime writes:          2167 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      7c5447a5-c4ae-483f-ac58-786ad0ecd86c
Journal backup:           inode blocks

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL: <http://lists.centos.org/pipermail/centos/attachments/20111111/c82df8a0/attachment.sig>