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sources/tech/20150126 4 lvcreate Command Examples on Linux.md
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Vic020
4 lvcreate Command Examples on Linux
在linux中4个lvcreate命令例子
================================================================================
Logical volume management (LVM) is a widely-used technique and extremely flexible disk management scheme. It basically contain three basic command :
逻辑卷管理（LVM）是广泛使用的技术，并拥有极其灵活磁盘管理方案。主要包含3个基础命令：
a. Creates the physical volumes using **pvcreate**
b. Create the volume group and add partition into volume group using **vgcreate**
c. Create a new logical volume using **lvcreate**
a. 创建物理卷使用**pvcreate**
b. 创建卷组并给卷组增加分区**vgcreate**
c. 创建新的逻辑卷使用**lvcreate**
![](http://www.ehowstuff.com/wp-content/uploads/2015/01/lvm-diagram1.jpg)
The following examples focus on the command to create a logical volume in an existing volume group, **lvcreate**. **lvcreate** is the command do allocating logical extents from the free physical extent pool of that volume group. Normally logical volumes use up any space available on the underlying physical volumes on a next-free basis. Modifying the logical volume will frees and reallocates space in the physical volumes. The following **lvcreate** command has been tested on linux CentOS 5, CentOS 6, CentOS 7, RHEL 5, RHEl 6 and RHEL 7 version.
随后的例子着重在已经存在的卷组上使用**lvcreate**创建逻辑卷。**lvcreate**命令可以在来自自由物理扩展池的卷组分配逻辑扩展。通常，逻辑卷可以随意使用底层逻辑卷上的任意空间。修改逻辑卷将释放或重新分配在物理卷空间。这些例子已经在CentOS 5, CentOS 6, CentOS 7, RHEL 5, RHEl 6 和 RHEL 7 版本中测试通过。
### 4 lvcreate Command Examples on Linux : ###
### 4个lvcreate命令例子 ###
1. The following command creates a logical volume 15 gigabytes in size in the volume group vg_newlvm :
1. 在名为vg_newlvm卷组中创建15G大小的逻辑卷：
[root@centos7 ~]# lvcreate -L 15G vg_newlvm
2. The following command creates a 2500 MB linear logical volume named centos7_newvol in the volume group
vg_newlvm, creating the block device /dev/vg_newlvm/centos7_newvol :
2. 在名为vg_newlvm中创建大小为2500MB的逻辑卷并命名centos7_newvol，创建块设备/dev/vg_newlvm/centos7_newvol：
[root@centos7 ~]# lvcreate -L 2500 -n centos7_newvol vg_newlvm
3. You can use the -l argument of the **lvcreate** command to specify the size of the logical volume in extents. You can also use this argument to specify the percentage of the volume group to use for the logical volume. The following command creates a logical volume called centos7_newvol that uses 50% of the total space in volume group vg_newlvm :
3.可以使用**lvcreate**命令的参数-l，能指定一些特别的逻辑卷扩展大小。也可以使用这个参数以卷组的大小百分比来扩展逻辑卷。这下列的命令创建了centos7_newvol卷组的50%大小的逻辑卷vg_newlvm:
[root@centos7 ~]# lvcreate -l 50%VG -n centos7_newvol vg_newlvm
4. The following command creates a logical volume called centos7_newvol that uses all of the unallocated space in the volume group vg_newlvm :
4. 使用卷组剩下的所有空间创建逻辑卷
[root@centos7 ~]# lvcreate --name centos7_newvol -l 100%FREE vg_newlvm
To see more **lvcreate** command options, issue the following command :
更多帮助，使用**lvcreate**命令--help选项来查看：
[root@centos7 ~]# lvcreate --help
----------
以下空号中是帮助字面翻译
lvcreate: Create a logical volume
lvcreate: Create a logical volume（创建逻辑卷）
lvcreate
[-A|--autobackup {y|n}]
[-A|--autobackup {y|n}]（自动备份）
[-a|--activate [a|e|l]{y|n}]
[--addtag Tag]
[--alloc AllocationPolicy]
[--cachemode CacheMode]
[--addtag Tag]（增加标签）
[--alloc AllocationPolicy]（分配策略）
[--cachemode CacheMode]（Cache模式）
[-C|--contiguous {y|n}]
[-d|--debug]
[-h|-?|--help]
[--ignoremonitoring]
[--monitor {y|n}]
[--ignoremonitoring]（忽略监听）
[--monitor {y|n}]（监听）
[-i|--stripes Stripes [-I|--stripesize StripeSize]]
[-k|--setactivationskip {y|n}]
[-K|--ignoreactivationskip]
{-l|--extents LogicalExtentsNumber[%{VG|PVS|FREE}] |
-L|--size LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
{-l|--extents LogicalExtentsNumber[%{VG|PVS|FREE}] |（逻辑扩展数）
-L|--size LogicalVolumeSize[bBsSkKmMgGtTpPeE]}（逻辑卷大小）
[-M|--persistent {y|n}] [--major major] [--minor minor]
[-m|--mirrors Mirrors [--nosync] [{--mirrorlog {disk|core|mirrored}|--corelog}]]
[-n|--name LogicalVolumeName]
[-m|--mirrors Mirrors [--nosync] [{--mirrorlog {disk|core|mirrored}|--corelog}]]（镜像）
[-n|--name LogicalVolumeName]（逻辑卷名字）
[--noudevsync]
[-p|--permission {r|rw}]
[--[raid]minrecoveryrate Rate]
[--[raid]maxrecoveryrate Rate]
[-r|--readahead ReadAheadSectors|auto|none]
[-R|--regionsize MirrorLogRegionSize]
[-T|--thin [-c|--chunksize ChunkSize]
[-r|--readahead ReadAheadSectors|auto|none]（读取头扇区）
[-R|--regionsize MirrorLogRegionSize]（镜像逻辑区域尺寸）
[-T|--thin [-c|--chunksize ChunkSize]（块大小）
[--discards {ignore|nopassdown|passdown}]
[--poolmetadatasize MetadataSize[bBsSkKmMgG]]]
[--poolmetadataspare {y|n}]
[--thinpool ThinPoolLogicalVolume{Name|Path}]
[--thinpool ThinPoolLogicalVolume{Name|Path}]精简池逻辑卷
[-t|--test]
[--type VolumeType]
[--type VolumeType]（卷类型）
[-v|--verbose]
[-W|--wipesignatures {y|n}]
[-Z|--zero {y|n}]
@ -81,34 +79,7 @@ To see more **lvcreate** command options, issue the following command :
{ {-s|--snapshot} OriginalLogicalVolume[Path] |
[-s|--snapshot] VolumeGroupName[Path] -V|--virtualsize VirtualSize}
{-T|--thin} VolumeGroupName[Path][/PoolLogicalVolume]
-V|--virtualsize VirtualSize}
[-c|--chunksize]
[-A|--autobackup {y|n}]
[--addtag Tag]
[--alloc AllocationPolicy]
[-C|--contiguous {y|n}]
[-d|--debug]
[--discards {ignore|nopassdown|passdown}]
[-h|-?|--help]
[--ignoremonitoring]
[--monitor {y|n}]
[-i|--stripes Stripes [-I|--stripesize StripeSize]]
[-k|--setactivationskip {y|n}]
[-K|--ignoreactivationskip]
{-l|--extents LogicalExtentsNumber[%{VG|FREE|ORIGIN}] |
-L|--size LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
[--poolmetadatasize MetadataVolumeSize[bBsSkKmMgG]]
[-M|--persistent {y|n}] [--major major] [--minor minor]
[-n|--name LogicalVolumeName]
[--noudevsync]
[-p|--permission {r|rw}]
[-r|--readahead ReadAheadSectors|auto|none]
[-t|--test]
[--thinpool ThinPoolLogicalVolume[Path]]
[-v|--verbose]
[--version]
[PhysicalVolumePath...]
-V|--virtualsize VirtualSize}（
--------------------------------------------------------------------------------
via: http://www.ehowstuff.com/4-lvcreate-command-examples-on-linux/