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[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How to Create/Configure LVM (Logical Volume Management) in Linux)
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[#]: via: (https://www.2daygeek.com/create-lvm-storage-logical-volume-manager-in-linux/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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如何在 Linux 中创建/配置 LVM(逻辑卷管理)?
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======
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逻辑卷管理器 (LVM) 在 Linux 系统中扮演着重要的角色,它可以提高磁盘管理的可用性、磁盘 I/O、性能和能力。
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LVM 是一种被广泛使用的技术,对于磁盘管理来说,它是非常灵活的。
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它在物理磁盘和文件系统之间增加了一个额外的层,允许你创建一个逻辑卷而不是物理磁盘。
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LVM 允许你在需要的时候轻松地调整、扩展和减少逻辑卷的大小。
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![][1]
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### 如何创建 LVM 物理卷?
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你可以使用任何磁盘、RAID 阵列、SAN 磁盘或分区作为 LVM 物理卷。
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让我们想象一下,你已经添加了三个磁盘,它们是 /dev/sdb、/dev/sdc 和 /dev/sdd。
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运行以下命令来**[发现 Linux 中新添加的 LUN 或磁盘][2]**:
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```
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# ls /sys/class/scsi_host
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host0
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```
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```
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# echo "- - -" > /sys/class/scsi_host/host0/scan
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```
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```
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# fdisk -l
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```
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**创建物理卷 (pvcreate) 的一般语法:**
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```
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pvcreate [物理卷名]
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```
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当在系统中检测到磁盘,使用 pvcreate 命令初始化 LVM PV(物理卷):
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```
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# pvcreate /dev/sdb /dev/sdc /dev/sdd
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Physical volume "/dev/sdb" successfully created
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Physical volume "/dev/sdc" successfully created
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Physical volume "/dev/sdd" successfully created
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```
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**请注意:**
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* 上面的命令将删除给定磁盘 /dev/sdb、/dev/sdc 和 /dev/sdd 上的所有数据。
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* 物理磁盘可以直接添加到 LVM PV 中,而不是磁盘分区。
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使用 pvdisplay 和 pvs 命令来显示你创建的 PV。pvs 命令显示的是摘要输出,pvdisplay 显示的是 PV 的详细输出:
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```
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# pvs
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PV VG Fmt Attr PSize PFree
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/dev/sdb lvm2 a-- 15.00g 15.00g
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/dev/sdc lvm2 a-- 15.00g 15.00g
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/dev/sdd lvm2 a-- 15.00g 15.00g
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```
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```
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# pvdisplay
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"/dev/sdb" is a new physical volume of "15.00 GiB"
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--- NEW Physical volume ---
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PV Name /dev/sdb
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VG Name
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PV Size 15.00 GiB
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Allocatable NO
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PE Size 0
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Total PE 0
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Free PE 0
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Allocated PE 0
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PV UUID 69d9dd18-36be-4631-9ebb-78f05fe3217f
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"/dev/sdc" is a new physical volume of "15.00 GiB"
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--- NEW Physical volume ---
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PV Name /dev/sdc
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VG Name
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PV Size 15.00 GiB
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Allocatable NO
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PE Size 0
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Total PE 0
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Free PE 0
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Allocated PE 0
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PV UUID a2092b92-af29-4760-8e68-7a201922573b
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"/dev/sdd" is a new physical volume of "15.00 GiB"
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--- NEW Physical volume ---
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PV Name /dev/sdd
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VG Name
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PV Size 15.00 GiB
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Allocatable NO
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PE Size 0
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Total PE 0
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Free PE 0
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Allocated PE 0
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PV UUID d92fa769-e00f-4fd7-b6ed-ecf7224af7faS
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```
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### 如何创建一个卷组
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卷组是 LVM 结构中的另一层。基本上,卷组由你创建的 LVM 物理卷组成,你可以将物理卷添加到现有的卷组中,或者根据需要为物理卷创建新的卷组。
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**创建卷组 (vgcreate) 的一般语法:**
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```
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vgcreate [卷组名] [物理卷名]
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```
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使用以下命令将一个新的物理卷添加到新的卷组中:
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```
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# vgcreate vg01 /dev/sdb /dev/sdc /dev/sdd
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Volume group "vg01" successfully created
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```
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**请注意:**默认情况下,它使用 4MB 的物理范围,但你可以根据你的需要改变它。
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使用 vgs 和 vgdisplay 命令来显示你创建的 VG 的信息:
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```
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# vgs vg01
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VG #PV #LV #SN Attr VSize VFree
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vg01 3 0 0 wz--n- 44.99g 44.99g
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```
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```
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# vgdisplay vg01
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--- Volume group ---
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VG Name vg01
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System ID
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Format lvm2
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Metadata Areas 3
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Metadata Sequence No 1
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VG Access read/write
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VG Status resizable
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MAX LV 0
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Cur LV 0
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Open LV 0
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Max PV 0
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Cur PV 3
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Act PV 3
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VG Size 44.99 GiB
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PE Size 4.00 MiB
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Total PE 11511
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Alloc PE / Size 0 / 0
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Free PE / Size 11511 / 44.99 GiB
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VG UUID d17e3c31-e2c9-4f11-809c-94a549bc43b7
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```
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### 如何扩展卷组
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如果 VG 没有空间,请使用以下命令将新的物理卷添加到现有卷组中。
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**卷组扩展 (vgextend) 的一般语法:**
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```
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vgextend [已有卷组名] [物理卷名]
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```
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```
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# vgextend vg01 /dev/sde
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Volume group "vg01" successfully extended
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```
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### 如何以 GB 为单位创建逻辑卷?
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逻辑卷是 LVM 结构中的顶层。逻辑卷是由卷组创建的块设备。它作为一个虚拟磁盘分区,可以使用 LVM 命令轻松管理。
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你可以使用 lvcreate 命令创建一个新的逻辑卷。
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**创建逻辑卷 (lvcreate) 的一般语法:**
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```
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lvcreate –n [逻辑卷名] –L [逻辑卷大小] [要创建的 LV 所在的卷组名称]
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```
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运行下面的命令,创建一个大小为 10GB 的逻辑卷 lv001:
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```
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# lvcreate -n lv001 -L 10G vg01
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Logical volume "lv001" created
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```
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使用 lvs 和 lvdisplay 命令来显示你所创建的 LV 的信息:
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```
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# lvs /dev/vg01/lvol01
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LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
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lv001 vg01 mwi-a-m-- 10.00g lv001_mlog 100.00
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```
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```
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# lvdisplay /dev/vg01/lv001
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--- Logical volume ---
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LV Path /dev/vg01/lv001
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LV Name lv001
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VG Name vg01
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LV UUID ca307aa4-0866-49b1-8184-004025789e63
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LV Write Access read/write
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LV Creation host, time localhost.localdomain, 2020-09-10 11:43:05 -0700
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LV Status available
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# open 0
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LV Size 10.00 GiB
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Current LE 2560
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Segments 1
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Allocation inherit
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Read ahead sectors auto
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- currently set to 256
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Block device 253:4
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```
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### 如何以 PE 大小创建逻辑卷?
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或者,你可以使用物理扩展 (PE) 大小创建逻辑卷。
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### 如何计算 PE 值?
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很简单,例如,如果你有一个 10GB 的卷组,那么 PE 大小是多少?
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默认情况下,它使用 4MB 的物理扩展,但通过运行 vgdisplay 命令来检查正确的 PE 大小,因为这可以根据需求进行更改。
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```
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10GB = 10240MB / 4MB (PE 大小) = 2560 PEs
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```
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**用 PE 大小创建逻辑卷 (lvcreate) 的一般语法:**
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```
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lvcreate –n [逻辑卷名] –l [物理扩展 (PE) 大小] [要创建的 LV 所在的卷组名称]
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```
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要使用 PE 大小创建 10GB 的逻辑卷,命令如下:
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```
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# lvcreate -n lv001 -l 2560 vg01
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```
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### 如何创建文件系统
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在创建有效的文件系统之前,你不能使用逻辑卷。
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**创建文件系统的一般语法:**
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```
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mkfs –t [文件系统类型] /dev/[LV 所在的卷组名称]/[LV 名称]
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```
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使用以下命令将逻辑卷 lv001 格式化为 ext4 文件系统:
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```
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# mkfs -t ext4 /dev/vg01/lv001
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```
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对于 xfs 文件系统:
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```
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# mkfs -t xfs /dev/vg01/lv001
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```
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### 挂载逻辑卷
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最后,你需要挂载逻辑卷来使用它。确保在 **/etc/fstab** 中添加一个条目,以便系统启动时自动加载。
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创建一个目录来挂载逻辑卷:
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```
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# mkdir /lvmtest
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```
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使用挂载命令 **[挂载逻辑卷][3]**:
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```
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# mount /dev/vg01/lv001 /lvmtest
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```
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在 **[/etc/fstab 文件][4]**中添加新的逻辑卷详细信息,以便系统启动时自动挂载:
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```
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# vi /etc/fstab
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/dev/vg01/lv001 /lvmtest xfs defaults 0 0
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```
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使用 **[df 命令][5]**检查新挂载的卷:
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```
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# df -h /lvmtest
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Filesystem Size Used Avail Use% Mounted on
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/dev/mapper/vg01-lv001 15360M 34M 15326M 4% /lvmtest
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/create-lvm-storage-logical-volume-manager-in-linux/
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作者:[Magesh Maruthamuthu][a]
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选题:[lujun9972][b]
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译者:[geekpi](https://github.com/geekpi)
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校对:[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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[2]: https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/
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[3]: https://www.2daygeek.com/mount-unmount-file-system-partition-in-linux/
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[4]: https://www.2daygeek.com/understanding-linux-etc-fstab-file/
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[5]: https://www.2daygeek.com/linux-check-disk-space-usage-df-command/
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