Flexのファイルシステム(公開)

以下は flex を中心としたファイルシステムの理解のために 齋藤が2008.10.9に作成したものである。

flex の論理ボリュームの変更

LVMを使ってみよう!のページが大変参考になった。感謝する。

[root@flex opt]# vgdisplay -C
  VG   #PV #LV #SN Attr   VSize   VFree
  VG     2   6   0 wz--n- 465.66G 153.66G

[root@flex opt]# lvdisplay -C

 LV       VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
 LVhome   VG   -wi-ao 210.00G
 LVroot   VG   -wi-ao  10.00G
 LVrsaito VG   -wi-ao  30.00G
 LVsamba  VG   -wi-ao 170.00G
 LVswap   VG   -wi-ao   2.00G
 LVwww    VG   -wi-ao  20.00G
[root@flex rsaito]# lvdisplay
 --- Logical volume ---
 LV Name                /dev/VG/LVroot
 VG Name                VG
 LV UUID                HwBaP5-T627-4hWH-iRoG-HM1S-SpEN-4f61hQ
 LV Write Access        read/write
 LV Status              available
 # open                 1
 LV Size                10.00 GB
 Current LE             640
 Segments               2
 Allocation             inherit
 Read ahead sectors     auto
 - currently set to     256
 Block device           253:0
[root@flex rsaito]# lvextend -L 20G /dev/VG/LVroot
[root@flex rsaito]# lvdisplay
 --- Logical volume ---
 LV Name                /dev/VG/LVroot
 VG Name                VG
 LV UUID                HwBaP5-T627-4hWH-iRoG-HM1S-SpEN-4f61hQ
 LV Write Access        read/write
 LV Status              available
 # open                 1
 LV Size                20.00 GB <----- 20GB になった。
 Current LE             640
 Segments               2
 Allocation             inherit
 Read ahead sectors     auto
 - currently set to     256
 Block device           253:0
[root@flex rsaito]# df
Filesystem            1K-ブロック    使用   使用可 使用% マウント位置
/dev/mapper/VG-LVroot  10321208   5646440  4150480  58%   /
[root@flex rsaito]# ext2online /dev/mapper/VG-LVroot
ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b 少し時間がかかる。
[root@flex rsaito]# df
Filesystem           1K-ブロック    使用   使用可 使用% マウント位置
/dev/mapper/VG-LVroot  20642428   5651508  13942472  29%   /
[root@flex rsaito]# lvreduce -L 30G /dev/VG/LVsamba やってはいけない。
[root@flex /]# lvremove /dev/VG/LVsamba
 Do you really want to remove active logical volume "LVsamba"? [y/n]: y
 Logical volume "LVsamba" successfully removed
root@flex /]# lvcreate -L 30G -n LVsamba VG
  Logical volume "LVsamba" created
[root@flex /]# lvdisplay
--- Logical volume ---
 LV Name                /dev/VG/LVsamba
 VG Name                VG
 LV UUID                AyaHX0-9n7F-e91Z-zjDM-cnnY-r0qR-lnQXaE
 LV Write Access        read/write
 LV Status              available
 # open                 0
 LV Size                30.00 GB
 Current LE             960
 Segments               1
 Allocation             inherit
 Read ahead sectors     auto
 - currently set to     256
 Block device           253:2
[root@flex /]# mkfs.ext3 /dev/mapper/VG-LVsamba
 mke2fs 1.35 (28-Feb-2004)
 Filesystem label=
 OS type: Linux
 Block size=4096 (log=2)
 Fragment size=4096 (log=2)
 3932160 inodes, 7864320 blocks
 393216 blocks (5.00%) reserved for the super user
 First data block=0
 Maximum filesystem blocks=8388608
 240 block groups
 32768 blocks per group, 32768 fragments per group
 16384 inodes per group
 Superblock backups stored on blocks:
       32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
       4096000
 Writing inode tables: done
 Creating journal (8192 blocks): done
 Writing superblocks and filesystem accounting information: done
 This filesystem will be automatically checked every 29 mounts or
 180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@flex /]# mount -a
[root@flex /]# df
Filesystem           1K-ブロック    使用   使用可 使用% マウント位置
 /dev/mapper/VG-LVroot
                     20642428   5651756  13942224  29% /
 /dev/md0                101018     70139     25663  74% /boot
 none                   2037136         0   2037136   0% /dev/shm
 /dev/mapper/VG-LVrsaito
                     30963708  12505368  16885476  43% /rsaito
 /dev/mapper/VG-LVhome
                    216745980 201378196   4357736  98% /home
 /dev/mapper/VG-LVwww  20642428   6448988  13144864  33% /www
 172.17.4.129:/pmphdd1
                    480719072 161010208 295289664  36% /pmphdd
 /dev/mapper/VG-LVsamba
                     30963708     77888  29312956   1% /samba
 [root@flex opt]# vgdisplay
 --- Volume group ---
 VG Name               VG
 System ID
 Format                lvm2
 Metadata Areas        2
 Metadata Sequence No  17
 VG Access             read/write
 VG Status             resizable
 MAX LV                0
 Cur LV                6
 Open LV               6
 Max PV                0
 Cur PV                2
 Act PV                2
 VG Size               465.66 GB
 PE Size               32.00 MB
 Total PE              14901
 Alloc PE / Size       9984 / 312.00 GB
 Free  PE / Size       4917 / 153.66 GB
 VG UUID               BYvdTx-aZun-99XI-POhe-UMK9-2mck-x9Aets
[root@flex opt]# umount /dev/mapper/VG-LVsamba
[root@flex opt]# fsck.ext3 -f /dev/mapper/VG-LVsamba
e2fsck 1.35 (28-Feb-2004)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/VG-LVsamba: 11/3932160 files (9.1% non-contiguous),  142865/7864320  blocks
[root@flex opt]# resize2fs /dev/mapper/VG-L Vsamba 20G
resize2fs 1.35 (28-Feb-2004)
Resizing the filesystem on /dev/mapper/VG-LVsamba to 5242880 (4k) blocks.
The filesystem on /dev/mapper/VG-LVsamba is now 5242880 blocks long.
[root@flex opt]# mount -a
[root@flex opt]# df
Filesystem           1K-ブロック    使用   使用可 使用% マウント位置
/dev/mapper/VG-LVroot
                     20642428   6598612  12995368  34% /
/dev/md0                101018     70139     25663  74% /boot
none                   2037136         0   2037136   0% /dev/shm
/dev/mapper/VG-LVrsaito
                     30963708  12505368  16885476  43% /rsaito
/dev/mapper/VG-LVhome
                    216745980 201378196   4357736  98% /home
/dev/mapper/VG-LVwww  20642428   6146096  13447756  32% /www
172.17.4.129:/pmphdd1
                    480719072 161010208 295289664  36% /pmphdd
/dev/mapper/VG-LVsamba
                     20642428     77888  19515964   1% /samba
[root@flex opt]# lvdisplay -C
 LV       VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
 LVhome   VG   -wi-ao 210.00G
 LVroot   VG   -wi-ao  20.00G
 LVrsaito VG   -wi-ao  30.00G
 LVsamba  VG   -wi-ao  30.00G
 LVswap   VG   -wi-ao   2.00G
 LVwww    VG   -wi-ao  20.00G
[root@flex opt]# umount /dev/mapper/VG-LVsamba
[root@flex opt]# lvreduce -L 20G /dev/VG/LVsamba
 WARNING: Reducing active logical volume to 20.00 GB
 THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LVsamba? [y/n]: y
 Reducing logical volume LVsamba to 20.00 GB
 Logical volume LVsamba successfully resized
[root@flex opt]# lvdisplay -C
 LV       VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
 LVhome   VG   -wi-ao 210.00G
 LVroot   VG   -wi-ao  20.00G
 LVrsaito VG   -wi-ao  30.00G
 LVsamba  VG   -wi-a-  20.00G
 LVswap   VG   -wi-ao   2.00G
 LVwww    VG   -wi-ao  20.00G
[root@flex opt]# mount -a
[root@flex opt]# df
Filesystem           1K-ブロック    使用   使用可 使用% マウント位置
/dev/mapper/VG-LVroot
                     20642428   6598640  12995340  34% /
/dev/md0                101018     70139     25663  74% /boot
none                   2037136         0   2037136   0% /dev/shm
/dev/mapper/VG-LVrsaito
                     30963708  12505368  16885476  43% /rsaito
/dev/mapper/VG-LVhome
                    216745980 201378196   4357736  98% /home
/dev/mapper/VG-LVwww  20642428   6146096  13447756  32% /www
172.17.4.129:/pmphdd1
                    480719072 161010208 295289664  36% /pmphdd
/dev/mapper/VG-LVsamba
                     20642428     77888  19515964   1% /samba
[root@flex opt]# cd /samba
[root@flex samba]# ls -l 
合計 16
drwx------  2 root root 16384 10月  9 22:33 lost+found

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Last-modified: 2008-10-25 (土) 11:02:18