磁碟管理 lvm減容擴容

摘要： 參考https://blog.csdn.net/wk022/article/details/50543922 新增磁碟/dev/sdb fdisk /dev/sdb  分兩個分割槽  （n p 1 /n /n  n e 2 /n /n w） [root@localhost ~]#...

參考https://blog.csdn.net/wk022/article/details/50543922

新增磁碟/dev/sdb

fdisk /dev/sdb  分兩個分割槽  （n p 1 /n /n  n e 2 /n /n w）

[root@localhost ~]#fdisk -l /dev/sdb

磁碟 /dev/sdb：21.5 GB, 21474836480 位元組，41943040 個扇區 Units = 扇區 of 1 * 512 = 512 bytes 扇區大小(邏輯/物理)：512 位元組 / 512 位元組 I/O 大小(最小/最佳)：512 位元組 / 512 位元組 磁碟標籤型別：dos 磁碟識別符號：0xf648972d

裝置 Boot      Start         End      Blocks   Id  System /dev/sdb1            2048    20973567    10485760   83  Linux /dev/sdb2        20973568    41943039    10484736    5  Extended

建立物理卷

/dev/sdb1

[root@localhost ~]# pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created.

[root@localhost ~]# pvdisplay /dev/sdb1

--- Physical volume ---   PV Name               /dev/sdb1   VG Name               vg01   PV Size               10.00 GiB / not usable 16.00 MiB   Allocatable           yes   PE Size               16.00 MiB   Total PE              639   Free PE               319   Allocated PE          320   PV UUID               rZAmXt-S4E4-3S1s-dzs9-Xzda-PbJN-ZQ0EsY

建立卷組

vg01 [root@localhost ~]#vgcreate -s 16M vg01 /dev/sdb1  

Volume group "vg01" successfully created

[root@localhost ~]#vgdisplay vg01

--- Volume group ---   VG Name               vg01   System ID               Format                lvm2   Metadata Areas        1   Metadata Sequence No  2   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                1   Open LV               0   Max PV                0   Cur PV                1   Act PV                1   VG Size               9.98 GiB   PE Size               16.00 MiB   Total PE              639   Alloc PE / Size       320 / 5.00 GiB   Free  PE / Size       319 / 4.98 GiB   VG UUID               kCljZC-WILb-v3uX-jEkf-0Wbt-9q1o-UqXJkw

建立邏輯卷

lv01 [root@localhost ~]#lvcreate -L 5G -n lv01 vg01  

Logical volume "lv01" created.

[root@localhost ~]#lvdisplay /dev/vg01/lv01  

--- Logical volume ---   LV Path                /dev/vg01/lv01   LV Name                lv01   VG Name                vg01   LV UUID                WJvIar-IJ7H-yjzB-7jlt-UkHM-EE4E-04yzpY   LV Write Access        read/write   LV Creation host, time localhost.localdomain, 2019-02-27 23:36:35 +0800   LV Status              available   # open                 0   LV Size                5.00 GiB   Current LE             320   Segments               1   Allocation             inherit   Read ahead sectors     auto   - currently set to     8192   Block device           253:2

卷組內有剩餘空間時直接擴容

[root@localhost ~]#lvextend -L +5000M  /dev/vg01/lv01  

Rounding size to boundary between physical extents: 4.89 GiB.   Size of logical volume vg01/lv01 changed from 5.00 GiB (320 extents) to 9.89 GiB (633 extents).   Logical volume vg01/lv01 successfully resized.

resize2fs /dev/vgtest/lvtest＃更新檔案系統的大小，即啟用

卷組內沒有空餘空間時，先擴容vg 再擴容lv

[root@localhost ~]#pvcreate /dev/sdb2

WARNING: dos signature detected on /dev/sdb2 at offset 510. Wipe it? [y/n]:y   Wiping dos signature on /dev/sdb2.   Physical volume "/dev/sdb2" successfully created.

[root@localhost ~]#vgextend vg01 /dev/sdb2  

Volume group "vg01" successfully extended

[root@localhost ~]#vgdisplay vg01

--- Volume group ---   VG Name               vg01   System ID               Format                lvm2   Metadata Areas        2   Metadata Sequence No  8   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                1   Open LV               0   Max PV                0   Cur PV                2   Act PV                2   VG Size               <19.97 GiB   PE Size               16.00 MiB   Total PE              1278   Alloc PE / Size       633 / 9.89 GiB   Free  PE / Size       645 / <10.08 GiB   VG UUID               kCljZC-WILb-v3uX-jEkf-0Wbt-9q1o-UqXJkw

[root@localhost ~]#lvextend -L +5G /dev/vg01/lv01  

Size of logical volume vg01/lv01 changed from 9.89 GiB (633 extents) to 14.89 GiB (953 extents).   Logical volume vg01/lv01 successfully resized.

[root@localhost ~]#lvdisplay /dev/vg01/lv01  

--- Logical volume ---   LV Path                /dev/vg01/lv01   LV Name                lv01   VG Name                vg01   LV UUID                WJvIar-IJ7H-yjzB-7jlt-UkHM-EE4E-04yzpY   LV Write Access        read/write   LV Creation host, time localhost.localdomain, 2019-02-27 23:36:35 +0800   LV Status              available   # open                 0   LV Size                14.89 GiB   Current LE             953   Segments               2   Allocation             inherit   Read ahead sectors     auto   - currently set to     8192   Block device           253:2

減容到5G 掛載的話取消掛載umount /dev/vg01/lv01

[root@localhost ~]#lvreduce -L 5G /dev/vg01/lv01

WARNING: Reducing active logical volume to 5.00 GiB.   THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce vg01/lv01? [y/n]:y   Size of logical volume vg01/lv01 changed from 14.89 GiB (953 extents) to 5.00 GiB (320 extents).   Logical volume vg01/lv01 successfully resized.

刪除lvm邏輯卷 刪除 順序 lv>vg>pv

[root@localhost ~]#lvremove /dev/vg01/lv01

Do you really want to remove active logical volume vg01/lv01? [y/n]:y   Logical volume "lv01" successfully removed

[root@localhost ~]#vgremove vg01  

Volume group "vg01" successfully removed

[root@localhost ~]#pvremove /dev/sdb1

Labels on physical volume "/dev/sdb1" successfully wiped. [root@localhost ~]# pvremove /dev/sdb2   Labels on physical volume "/dev/sdb2" successfully wiped.