CentOS 5.4 버전 이상에는 아래와 같이 기본적으로 kernel module에 ext4를 지원하도록 lib가 포함되어 있다.
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[root@s-node01 dev]#
[root@s-node01 dev]# modprobe -l | grep ext4
/lib/modules/2.6.18-308.el5/kernel/fs/ext4/ext4.ko
[root@s-node01 dev]# |
하지만 ext4 파일시스템을 관리하고 생성하는 명령어는 기본적으로 설치되어 있지 않기 때문에 아래와 같이 yum repository를 통해 해당 패키지를 찾아 설치 할 수 있다.
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[root@s-node01 dev]#
[root@s-node01 dev]# yum provides /sbin/e4fsck
Loaded plugins: fastestmirror, priorities, security
Determining fastest mirrors
* base: centos.mirror.cdnetworks.com
* extras: centos.mirror.cdnetworks.com
* rpmforge: ftp.riken.jp
* updates: centos.mirror.cdnetworks.com
base | 1.1 kB 00:00
extras | 2.1 kB 00:00
rpmforge | 1.9 kB 00:00
updates | 1.9 kB 00:00
e4fsprogs-1.41.12-3.el5.x86_64 : Utilities for managing the fourth extended (ext4) filesystem
Repo : base
Matched from:
Filename : /sbin/e4fsck
e4fsprogs-1.41.12-4.el5_10.x86_64 : Utilities for managing the fourth extended (ext4) filesystem
Repo : updates
Matched from:
Filename : /sbin/e4fsck
[root@s-node01 dev]#
[root@s-node01 dev]# yum install -y e4fsprogs*
Loaded plugins: fastestmirror, priorities, security
Loading mirror speeds from cached hostfile
* base: centos.mirror.cdnetworks.com
* extras: centos.mirror.cdnetworks.com
* rpmforge: ftp.riken.jp
* updates: centos.mirror.cdnetworks.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package e4fsprogs.x86_64 0:1.41.12-4.el5_10 set to be updated
---> Package e4fsprogs-devel.i386 0:1.41.12-4.el5_10 set to be updated
---> Package e4fsprogs-devel.x86_64 0:1.41.12-4.el5_10 set to be updated
Transaction Test Succeeded
.
.
생략
.
.
Complete! |
패키지를 설치한 후 디스크에 대한 파티셔닝 후 아래와 같이 새로 추가된 mkfs.ext4 명령을 통해 파일시스템을 작성 한다.
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[root@s-node01 dev]#
[root@s-node01 dev]# mkfs.ext4 -L /archive /dev/sdd2
mke4fs 1.41.12 (17-May-2010)
Filesystem label=/archive
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
36160 inodes, 144585 blocks
7229 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=150994944
5 block groups
32768 blocks per group, 32768 fragments per group
7232 inodes per group
Superblock backups stored on blocks:
32768, 98304
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first. Use tune4fs -c or -i to override.
[root@s-node01 dev]# |
ext4 파일시스템은 기존 ext2,3 를 관리하는 명령어로 컨트롤 할 경우 아래와 같이 인식할 수 없는 상태로 나타난다.
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[root@s-node01 dev]#
[root@s-node01 dev]# tune2fs -l /dev/sdd2
tune2fs 1.39 (29-May-2006)
tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/sdd2
Couldn't find valid filesystem superblock.
[root@s-node01 dev]#
[root@s-node01 dev]# e2label /dev/sdd2
e2label: Filesystem has unsupported feature(s) while trying to open /dev/sdd2
Couldn't find valid filesystem superblock.
[root@s-node01 dev]# |
생성된 ext4 파일시스템의 상태를 확인하기 위해 아래와 같이 ext4 를 지원하는 명령을 통해 확인토록 한다.
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[root@s-node01 dev]#
[root@s-node01 dev]#
[root@s-node01 dev]# e4label /dev/sdd2
/archive
[root@s-node01 dev]#
[root@s-node01 dev]#
[root@s-node01 dev]# tune4fs -l /dev/sdd2
tune4fs 1.41.12 (17-May-2010)
Filesystem volume name: /archive
Last mounted on: <not available>
Filesystem UUID: 88296184-9b62-41fe-afd6-2889555617e8
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 36160
Block count: 144585
Reserved block count: 7229
Free blocks: 138102
Free inodes: 36149
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 35
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 7232
Inode blocks per group: 452
Flex block group size: 16
Filesystem created: Tue Jan 14 13:46:39 2014
Last mount time: n/a
Last write time: Tue Jan 14 13:46:40 2014
Mount count: 0
Maximum mount count: 30
Last checked: Tue Jan 14 13:46:39 2014
Check interval: 15552000 (6 months)
Next check after: Sun Jul 13 13:46:39 2014
Lifetime writes: 25 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: d6912746-daa0-4f57-b045-f6e52cbd9e7e
Journal backup: inode blocks
[root@s-node01 dev]# |
