《RedHatLinux邏輯卷的管理》——一條龍服務

Linux.應用發表於2014-04-22

首先建2分割槽

 

 

[root@localhost ~]# partx -d /dev/sdb

error deleting partition 4: BLKPG: No such device or address error deleting partitions 7-256: BLKPG: No such device or address

[root@localhost ~]# partx -a /dev/sdb                    同步分割槽表也可以使用partprobe來重新整理分割槽,力度沒有partx大

[root@localhost ~]# cat /proc/partitions     這裡面會顯示我們當前系統的分割槽

major minor 

#blocks  name

   8        0   41943040 sda    8        1     307200 sda1    8        2    4161536 sda2    8        3   37473280 sda3    8       16    8388608 sdb    8       17     204800 sdb1    8       18     204800 sdb2    8       19       1024 sdb3    8       21     307200 sdb5    8       22     102400 sdb6

[root@localhost ~]# pvcreate /dev/sdb5
  Writing physical volume data to disk "/dev/sdb5"
  Physical volume "/dev/sdb5" successfully created
[root@localhost ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree 
  /dev/sdb5       lvm2 a--  300.00m 300.00m

[root@localhost ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree 
  /dev/sdb5       lvm2 a--  300.00m 300.00m
[root@localhost ~]# pvdisplay
  "/dev/sdb5" is a new physical volume of "300.00 MiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb5
  VG Name              
  PV Size               300.00 MiB
  Allocatable           NO
  PE Size               0  
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               4YtDA6-RKEC-Nnh0-u2Qg-fSjv-q9bK-TaHsZJ

[root@localhost ~]# vgcreate vg0 /dev/sdb5
  Volume group "vg0" successfully created
[root@localhost ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree 
  vg0    1   0   0 wz--n- 296.00m 296.00m

[root@localhost ~]# lvcreate -L 100M -n lv0 /dev/vg0
  Logical volume "lv0" created
[root@localhost ~]# lvs
  LV   VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  lv0  vg0  -wi-a--- 100.00m                                          


   邏輯卷的擴充套件

比如當前的lv不夠用了,我們得擴充套件,怎麼辦?

[root@localhost ~]# lvextend -L +30M /dev/vg0/lv0
  Rounding size to boundary between physical extents: 32.00 MiB
  Extending logical volume lv0 to 132.00 MiB
  Logical volume lv0 successfully resized
[root@localhost ~]# lvs
  LV   VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  lv0  vg0  -wi-a--- 132.00m                                          
  

or

[root@localhost ~]# lvextend -L 200M /dev/vg0/lv0
  Extending logical volume lv0 to 200.00 MiB
  Logical volume lv0 successfully resized
[root@localhost ~]# lvs
  LV   VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  lv0  vg0  -wi-a--- 200.00m                  

如果我們的卷組不夠用了怎麼辦?      

     [root@localhost ~]# pvcreate /dev/sdb6
  Writing physical volume data to disk "/dev/sdb6"
  Physical volume "/dev/sdb6" successfully created
[root@localhost ~]# vgextend /dev/sdb6
  Please enter a physical volume path
  Run `vgextend --help' for more information.
[root@localhost ~]# vgextend /dev/sdb6 /dev/vg0
  Volume group "sdb6" not found
[root@localhost ~]# vgextend vg0 /dev/sdb6
  Volume group "vg0" successfully extended
[root@localhost ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree 
  vg0    2   1   0 wz--n- 392.00m 192.00m        

下面我們來玩線上拉伸就是線上擴充套件,還不損壞檔案系統     

[root@localhost ~]# mkfs.ext4 /dev/vg0/lv0

mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks 51200 inodes, 204800 blocks 10240 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=67371008 25 block groups 8192 blocks per group, 8192 fragments per group 2048 inodes per group Superblock backups stored on blocks:  8193, 24577, 40961, 57345, 73729

Writing inode tables: done                          

   Creating journal (4096 blocks): done Writing superblocks and filesystem accounting information: done

[root@localhost ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda3             36885072   9376624  25634784  27% /
tmpfs                   255524       264    255260   1% /dev/shm
/dev/sda1               297485     35202    246923  13% /boot
/dev/sr0               3027366   3027366         0 100% /media/RHEL_6.3 i386 Disc 1
[root@localhost ~]# mount /dev/vg0/lv0 /mnt/
[root@localhost ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda3             36885072   9376624  25634784  27% /
tmpfs                   255524       264    255260   1% /dev/shm
/dev/sda1               297485     35202    246923  13% /boot
/dev/sr0               3027366   3027366         0 100% /media/RHEL_6.3 i386 Disc 1
/dev/mapper/vg0-lv0     198337      5646    182451   4% /mnt
[root@localhost ~]#

[root@localhost ~]# e2fsck -f /dev/vg0/lv0

e2fsck 1.41.12 (17-May-2010) /dev/vg0/lv0 is mounted. 

WARNING!!!  The filesystem is mounted.   If you continue you ***WILL*** cause ***SEVERE*** filesystem damage.

Do you really want to continue (y/n)? yes

/dev/vg0/lv0: recovering journal 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/vg0/lv0: 11/51200 files (0.0% non-contiguous), 12109/204800 blocks

[root@localhost ~]# lvextend -L +30M /dev/vg0/lv0
  Rounding size to boundary between physical extents: 32.00 MiB
  Extending logical volume lv0 to 232.00 MiB
  Logical volume lv0 successfully resized

[root@localhost ~]# df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/sda3               38G   9.7G    27G  27% /
tmpfs                  262M   271k   262M   1% /dev/shm
/dev/sda1              305M    37M   253M  13% /boot
/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1
/dev/mapper/vg0-lv0    204M   5.8M   187M   4% /mnt

 

root@localhost ~]# resize2fs /dev/vg0/lv0

resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/vg0/lv0 is mounted on /mnt; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/vg0/lv0 to 237568 (1k) blocks. The filesystem on /dev/vg0/lv0 is now 237568 blocks long.

[root@localhost ~]# df -H

Filesystem             Size   Used  Avail Use% Mounted on

/dev/sda3               38G   9.7G    27G  27% /

tmpfs                  262M   271k   262M   1% /dev/shm

/dev/sda1              305M    37M   253M  13% /boot

/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1

/dev/mapper/vg0-lv0    236M   6.4M   218M   3% /mnt

邏輯卷的壓縮

[root@localhost ~]# df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/sda3               38G   9.7G    27G  27% /
tmpfs                  262M   271k   262M   1% /dev/shm
/dev/sda1              305M    37M   253M  13% /boot
/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1
/dev/mapper/vg0-lv1    102M   5.8M    91M   7% /mnt

[root@localhost ~]# umount /mnt/

[root@localhost ~]# e2fsck -f /dev/vg0/lv1

e2fsck 1.41.12 (17-May-2010) 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/vg0/lv1: 11/25688 files (9.1% non-contiguous), 8896/102400 blocks [root@localhost ~]# resize2fs /dev/vg0/lv1 30M

resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/vg0/lv1 to 30720 (1k) blocks. The filesystem on /dev/vg0/lv1 is now 30720 blocks long.

[root@localhost ~]# df -H

Filesystem             Size   Used  Avail Use% Mounted on

/dev/sda3               38G   9.7G    27G  27% /

tmpfs                  262M   271k   262M   1% /dev/shm

/dev/sda1              305M    37M   253M  13% /boot

/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1

[root@localhost ~]# mount /dev/vg0/lv1 /mnt/

[root@localhost ~]# df -H

Filesystem             Size   Used  Avail Use% Mounted on

/dev/sda3               38G   9.7G    27G  27% /

tmpfs                  262M   271k   262M   1% /dev/shm

/dev/sda1              305M    37M   253M  13% /boot

/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1

/dev/mapper/vg0-lv1     31M   5.0M    24M  18% /mnt

[root@localhost ~]# lvreduce -L 30M /dev/vg0/lv1

  Rounding size to boundary between physical extents: 32.00 MiB   WARNING: Reducing active and open logical volume to 32.00 MiB   THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv1? [y/n]: y

  Reducing logical volume lv1 to 32.00 MiB   Logical volume lv1 successfully resized

[root@localhost ~]# df -H

Filesystem             Size   Used  Avail Use% Mounted on

/dev/sda3               38G   9.7G    27G  27% /

tmpfs                  262M   271k   262M   1% /dev/shm

/dev/sda1              305M    37M   253M  13% /boot

/dev/sr0               3.2G   3.2G      0 100% /media/RHEL_6.3 i386 Disc 1

/dev/mapper/vg0-lv1     31M   5.0M    24M  18% /mnt

現在有2快pv,一塊大的用的很少,一塊小的有沒用,而我們現在想用那塊大的,資源緊張時,我們該怎麼節省空間 

 [root@localhost ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree 
  /dev/sdb5  vg0  lvm2 a--  296.00m 264.00m
  /dev/sdb6  vg0  lvm2 a--   96.00m  96.00m
[root@localhost ~]# pvmove /dev/sdb5 /dev/sdb6
  /dev/sdb5: Moved: 0.0%
  /dev/sdb5: Moved: 100.0%
[root@localhost ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree 
  /dev/sdb5  vg0  lvm2 a--  296.00m 296.00m
  /dev/sdb6  vg0  lvm2 a--   96.00m  64.00m

最後我們來移除邏輯卷

 

[root@localhost ~]# umount /mnt/
[root@localhost ~]# lvremove /dev/vg0/lv1
Do you really want to remove active logical volume lv1? [y/n]: y
  Logical volume "lv1" successfully removed
[root@localhost ~]# lvs
[root@localhost ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree 
  vg0    2   0   0 wz--n- 392.00m 392.00m
[root@localhost ~]# vgremove /dev/vg0
  Volume group "vg0" successfully removed
[root@localhost ~]# vgs
  No volume groups found
[root@localhost ~]# pvremove /dev/sdb5
  Labels on physical volume "/dev/sdb5" successfully wiped
[root@localhost ~]# pvremove /dev/sdb6
  Labels on physical volume "/dev/sdb6" successfully wiped
[root@localhost ~]# pvs

到此我們的邏輯卷就完了

 

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