I.
LV相關指令
x.
lvcreate : 建立LV
xi.
lvremove : 移除LV
xii.
lvextend : 在LV裡增加容量
xiii.
lvreduce : 在LV裡減少容量
xiv.
lvresize : 對LV進行容量大小調整
xv.
lvscan : 搜尋系統內的LV
xvi.
lvdisplay : 顯示LV狀態
xvii.
lvmdiskscan: 搜尋所有的Block裝置
xviii.
lvs : 產生LV標準化輸出的資訊
II.
建立LV
i.
指令: lvcreate [-L
N[mgt]] [-n LV名稱] VG名稱
ii.
指令: lvcreate [-l N]
[-n LV名稱] VG名稱
iii.
–L : 後面接容量,容量的單位可以是 M,G,T 等
iv.
–l : 後面可以接 PE 的數量。PE數量乘上PE大小(16M)就是可用容量了。
[root@JLAB
~]# lvcreate -l 2493 -n jlv jvg
Logical volume "jlv" created
或
[root@JLAB
~]# lvcreate -L 38G -n jlv jvg
III. 在系統上可看到建立好的LV磁碟
[root@JLAB ~]# ll /dev/jvg/jlv
lrwxrwxrwx 1
root root 7 Jul 10 15:43 /dev/jvg/jlv -> ../dm-0
[root@JLAB ~]# fdisk -l
/dev/mapper/jvg-jlv
Disk
/dev/mapper/jvg-jlv: 41.8 GB, 41825599488 bytes
255
heads, 63 sectors/track, 5085 cylinders
Units =
cylinders of 16065 * 512 = 8225280 bytes
Sector
size (logical/physical): 512 bytes / 512 bytes
I/O size
(minimum/optimal): 512 bytes / 512 bytes
Disk
identifier: 0x00000000
IV. 搜尋已建立好的LV
[root@JLAB ~]# lvscan
ACTIVE '/dev/jvg/jlv' [38.95 GiB]
inherit
V.
顯示LV資訊
[root@JLAB
~]# lvdisplay
--- Logical volume ---
LV Path /dev/jvg/jlv
LV Name jlv
VG Name jvg
LV UUID
tk6dUY-bRuU-p9Z3-RnXh-j8Yf-i9LX-JGwR3R
LV Write Access read/write
LV Creation host, time JTSM, 2013-07-10
15:43:21 +0800
LV Status available
# open 0
LV Size 38.95 GiB
Current LE 2493
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
VI. 顯示系統上所有的Block裝置
[root@JLAB
~]# lvmdiskscan
/dev/ram0 [ 16.00 MiB]
/dev/loop0 [ 3.46 GiB]
/dev/md0 [ 15.99 GiB] LVM physical volume
/dev/tsmvg/tsmlv [ 38.95 GiB]
/dev/ram1 [ 16.00 MiB]
/dev/loop1 [ 3.46 GiB]
/dev/sda1 [ 50.00 GiB]
/dev/md1 [ 12.99 GiB] LVM physical volume
/dev/ram2 [ 16.00 MiB]
/dev/md2 [ 9.99 GiB] LVM physical volume
/dev/ram3 [ 16.00 MiB]
/dev/ram4 [ 16.00 MiB]
/dev/ram5 [ 16.00 MiB]
/dev/ram6 [ 16.00 MiB]
/dev/ram7 [ 16.00 MiB]
/dev/ram8 [ 16.00 MiB]
/dev/ram9 [ 16.00 MiB]
/dev/ram10 [ 16.00 MiB]
/dev/ram11 [ 16.00 MiB]
/dev/ram12 [ 16.00 MiB]
/dev/ram13 [ 16.00 MiB]
/dev/ram14 [ 16.00 MiB]
/dev/ram15 [ 16.00 MiB]
/dev/sdh [ 20.00 GiB]
/dev/sdi [ 8.00 GiB]
3 disks
19 partitions
0 LVM physical volume whole disks
3 LVM physical volumes
IX. 產生LV標準化輸出的資訊
[root@JLAB
~]# lvs
LV
VG Attr LSize
Pool Origin Data% Move Log
Cpy%Sync Convert
tsmlv tsmvg
-wi-ao--- 38.95g
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