Linux磁盘管理：lvcreate 常用命令
查看当前LV及PV信息：# hostnamectl
Static hostname: localhost.localdomain
Transient hostname: rusky.com
Icon name: computer-vm
Chassis: vm
Machine ID: 9c10c7a9e32e40acb19659a30f73603b
Boot ID: d20cdc4bccf04de3bc2639830b61a8e6
Virtualization: kvm
Operating System: Red Hat Enterprise Linux Server 7.2 (Maipo)
CPE OS Name: cpe:/o:redhat:enterprise_linux:7.2:GA:server
Kernel: Linux 3.10.0-327.el7.x86_64
Architecture: x86-64
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# pvs
PV VG FmtAttr PSizePFree
/dev/sda2rhel lvm2 a-- 7.51g 40.00m
/dev/sdb yum_repo_vg lvm2 a--15.00g 15.00g --有一个15G大小的PV，VG名字为yum_repo_vg
# lvs --有两个默认的LV:root、swap
LV VG Attr LSize Pool Origin Data%Meta%Move Log Cpy%Sync Convert
root rhel -wi-ao---- 6.67g
swap rhel -wi-ao---- 820.00m
1. 在名为yum_repo_vg的卷组上创建一个大小为5GB的逻辑卷
# lvcreate -L 5G yum_repo_vg
Logical volume "lvol0" created.
# lvs
LV VG Attr LSize Pool Origin Data%Meta%Move Log Cpy%Sync Convert
rootrhel -wi-ao---- 6.67g
swaprhel -wi-ao---- 820.00m
lvol0 yum_repo_vg -wi-a----- 5.00g
虽然没有用-n指定逻辑卷的名字，但是lvcreate命令会自动命名逻辑卷lvo10.
2. 在名为yum_repo_vg的卷组上创建一个大小为2GB的逻辑卷yum_repo_lvm
# lvcreate -L 2G -n yum_repo_lvm yum_repo_vg
Logical volume "yum_repo_lvm" created.
# lvs
LV VG Attr LSize Pool Origin Data%Meta%Move Log Cpy%Sync Convert
root rhel -wi-ao---- 6.67g
swap rhel -wi-ao---- 820.00m
lvol0 yum_repo_vg -wi-a----- 5.00g
yum_repo_lvm yum_repo_vg -wi-a----- 2.00g
使用-n指定逻辑卷的名字
3. 在名为yum_repo_vg的卷组上创建一个逻辑卷yum_repo_lvm2，大小为50%的VG
# pvs
PV VG FmtAttr PSizePFree
/dev/sda2rhel lvm2 a-- 7.51g 40.00m
/dev/sdb yum_repo_vg lvm2 a--15.00g8.00g
# lvcreate -l 50%VG -n yum_repo_lvm2 yum_repo_vg
Logical volume "yum_repo_lvm2" created.
# lvs
LV VG Attr LSize Pool Origin Data%Meta%Move Log Cpy%Sync Convert
root rhel -wi-ao---- 6.67g
swap rhel -wi-ao---- 820.00m
lvol0 yum_repo_vg -wi-a----- 5.00g
yum_repo_lvmyum_repo_vg -wi-a----- 2.00g
yum_repo_lvm2 yum_repo_vg -wi-a----- 7.50g ---使用的是50%VG.PSize
注意：-l 50%VG是使用PSize的50%，而不是PFree的50%，如果是使用%80VG=12G，大于PFree8G,则报错
4. 在名为yum_repo_vg的卷组上创建一个逻辑卷yum_repo_lvm3，使用全部可用VG空间
# pvs
PV VG FmtAttr PSizePFree
/dev/sda2rhel lvm2 a-- 7.51g40.00m
/dev/sdb yum_repo_vg lvm2 a--15.00g 512.00m
# lvcreate -l 100%FREE -n yum_repo_lvm3 yum_repo_vg
Logical volume "yum_repo_lvm3" created.
# lvs
LV VG Attr LSize Pool Origin Data%Meta%Move Log Cpy%Sync Convert
root rhel -wi-ao---- 6.67g
swap rhel -wi-ao---- 820.00m
lvol0 yum_repo_vg -wi-a----- 5.00g
yum_repo_lvmyum_repo_vg -wi-a----- 2.00g
yum_repo_lvm2 yum_repo_vg -wi-a----- 7.50g
yum_repo_lvm3 yum_repo_vg -wi-a----- 512.00m --使用全部的PFee
# pvs
PV VG FmtAttr PSizePFree
/dev/sda2rhel lvm2 a-- 7.51g 40.00m
/dev/sdb yum_repo_vg lvm2 a--15.00g 0 --PFree为0
原文参考：http://www.ehowstuff.com/4-lvcreate-command-examples-on-linux/
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