리눅스 dumpe2fs

1 개요

리눅스 dumpe2fs

/sbin/dumpe2fs

• "dump filesystem information"
• 파일시스템 정보 출력
• 파일시스템의 블록 정보를 보여주는 리눅스 명령어
• 지정한 파일시스템의 슈퍼블록, 블록그룹 정보 출력

2 실행예시 1

[root@zetawiki ~]# fdisk -l /dev/xvda

Disk /dev/xvda: 31.4 GB, 31457280000 bytes
255 heads, 63 sectors/track, 3824 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1          13      104391   83  Linux
/dev/xvda2              14        3824    30611857+  8e  Linux LVM

[root@zetawiki ~]# dumpe2fs /dev/xvda1
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name:   /boot
Last mounted on:          <not available>
Filesystem UUID:          5976dfab-b217-4dfa-90c3-7c50cc3ed0b9
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              26104
Block count:              104388
Reserved block count:     5219
Free blocks:              64318
Free inodes:              26045
First block:              1
Block size:               1024
Fragment size:            1024
Reserved GDT blocks:      256
Blocks per group:         8192
Fragments per group:      8192
Inodes per group:         2008
Inode blocks per group:   251
Filesystem created:       Thu Sep  4 09:49:10 2008
Last mount time:          Sat May 25 13:13:39 2013
Last write time:          Sat May 25 13:13:39 2013
Mount count:              43
Maximum mount count:      -1
Last checked:             Thu Sep  4 09:49:10 2008
Check interval:           0 (<none>)
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:		  128
Journal inode:            8
Default directory hash:   tea
Directory Hash Seed:      30bd8d42-905e-4d52-bbdc-3d007f720a5f
Journal backup:           inode blocks
Journal size:             4114k


Group 0: (Blocks 1-8192)
  Primary superblock at 1, Group descriptors at 2-2
  Reserved GDT blocks at 3-258
  Block bitmap at 259 (+258), Inode bitmap at 260 (+259)
  Inode table at 261-511 (+260)
  0 free blocks, 1975 free inodes, 2 directories
  Free blocks: 
  Free inodes: 34-2008
Group 1: (Blocks 8193-16384)
  Backup superblock at 8193, Group descriptors at 8194-8194
  Reserved GDT blocks at 8195-8450
  Block bitmap at 8451 (+258), Inode bitmap at 8452 (+259)
  Inode table at 8453-8703 (+260)
  0 free blocks, 2008 free inodes, 0 directories
  Free blocks: 
  Free inodes: 2009-4016
Group 2: (Blocks 16385-24576)
  Block bitmap at 16385 (+0), Inode bitmap at 16386 (+1)
  Inode table at 16387-16637 (+2)
  0 free blocks, 2008 free inodes, 0 directories
  Free blocks: 
  Free inodes: 4017-6024
... (생략)
Group 12: (Blocks 98305-104387)
  Block bitmap at 98305 (+0), Inode bitmap at 98306 (+1)
  Inode table at 98307-98557 (+2)
  5830 free blocks, 2008 free inodes, 0 directories
  Free blocks: 98558-104387
  Free inodes: 24097-26104

[root@zetawiki ~]# dumpe2fs /dev/xvda2
dumpe2fs 1.39 (29-May-2006)
dumpe2fs: Bad magic number in super-block while trying to open /dev/xvda2
Couldn't find valid filesystem superblock.

3 실행예시 2

[root@zetawiki ~]# dumpe2fs /dev/mapper/VolGroup00-LogVol00
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          c21e396b-113a-439d-bb93-4ef984df081c
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              9451456
Block count:              9445376
Reserved block count:     472268
Free blocks:              7103332
Free inodes:              9311254
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1021
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         32704
Inode blocks per group:   1022
Filesystem created:       Tue Apr 24 19:59:09 2012
Last mount time:          Thu Dec 11 08:56:55 2014
Last write time:          Thu Dec 11 10:06:07 2014
Mount count:              20
Maximum mount count:      -1
Last checked:             Tue Apr 24 19:59:09 2012
Check interval:           0 (<none>)
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:		  128
Journal inode:            8
Default directory hash:   tea
Directory Hash Seed:      f40e8c1c-156c-412f-a282-bba10e1c3643
Journal backup:           inode blocks
Journal size:             128M


Group 0: (Blocks 0-32767)
  Primary superblock at 0, Group descriptors at 1-3
  Reserved GDT blocks at 4-1024
  Block bitmap at 1025 (+1025), Inode bitmap at 1026 (+1026)
  Inode table at 1027-2048 (+1027)
  0 free blocks, 32693 free inodes, 2 directories
  Free blocks: 
  Free inodes: 12-32704
... (생략)
Group 288: (Blocks 9437184-9445375)
  Block bitmap at 9437184 (+0), Inode bitmap at 9437185 (+1)
  Inode table at 9437186-9438207 (+2)
  7168 free blocks, 32704 free inodes, 0 directories
  Free blocks: 9438208-9445375
  Free inodes: 9418753-9451456

4 같이 보기

• 리눅스 파티션 블록 크기 확인
• 리눅스 fsck
• 리눅스 tune2fs

5 참고

• http://guswnsla1223.tistory.com/133