两个pv挂一个vg"/>
两个pv挂一个vg
一、LVM中PV创建，VG创建，LV创建，LV格式化，LV挂载实例
实战测试环境如下：[root@db01 /]# fdisk -l |grep "Disk /dev/sd" ###查看当前所加载磁盘
Disk /dev/sda: 53.7 GB, 53687091200 bytes
Disk /dev/sdb: 107.4 GB, 107374182400 bytes
Disk /dev/sdc: 107.4 GB, 107374182400 bytes
Disk /dev/sdd: 1073 MB, 1073741824 bytes
Disk /dev/sde: 2147 MB, 2147483648 bytes
Disk /dev/sdf: 2147 MB, 2147483648 bytes
Disk /dev/sdg: 2147 MB, 2147483648 bytes
Disk /dev/sdh: 2147 MB, 2147483648 bytes
【实战内容】
根据以上测试环境，先使用dev/sde dev/sdf dev/sdg 演示LVM的创建，再使用/dev/sdh进行扩容
操作步骤
1.先使用dev/sde /dev/sdf /dev/sdg创建pv
2.根据创建的pv创建vg
3.从刚创建的vg中划出lv
【实战开始】
(1)创建PV，包含/dev/sde /dev/sdf /dev/sdg[root@db01 /]# pvcreate /dev/sde /dev/sdf /dev/sdg
Physical volume "/dev/sde" successfully created
Physical volume "/dev/sdf" successfully created
Physical volume "/dev/sdg" successfully created
[root@db01 /]# pvs ###查看pv的信息
PV VG Fmt Attr PSize PFree
/dev/sde lvm2 a-- 2.00g 2.00g
/dev/sdf lvm2 a-- 2.00g 2.00g
/dev/sdg lvm2 a-- 2.00g 2.00g
[root@db01 /]#
[root@db01 /]# pvdisplay ###查看pv相关属性
"/dev/sde" is a new physical volume of "2.00 GiB" ###物理卷 /dev/sde的信息
--- NEW Physical volume ---
PV Name /dev/sde ##物理卷名称
VG Name ##卷组名称
PV Size 2.00 GiB ###物理卷 /dev/sde 大小
Allocatable NO ###分配情况，NO：未分配 Yes：已分配
PE Size 0 ###PE 物理扩展大小，为0 表示还未创建vg
Total PE 0 ###总PE数量
Free PE 0 ###空闲PE数量
Allocated PE 0 ###分配PE数量
PV UUID ycc95W-fTpg-toEV-DqPI-4qun-FcDr-tukLcL ###PV的标识
"/dev/sdf" is a new physical volume of "2.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdf
VG Name
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID VfAa2h-Ubkp-7S1F-927g-buPO-UPXY-9eRHMu
"/dev/sdg" is a new physical volume of "2.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdg
VG Name
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID Cc2Zm7-iSUO-P7T1-5vtm-rGRO-TdPB-huDMLm
(2)根据PV创建VG，VG的命名为oraclevg[root@db01 /]# vgcreate oraclevg /dev/sde /dev/sdf /dev/sdg
Volume group "oraclevg" successfully created
[root@db01 /]#
[root@db01 /]# vgs ###查看vg的信息
VG #PV #LV #SN Attr VSize VFree
oraclevg 3 0 0 wz--n- 5.99g 5.99g
[root@db01 /]#
[root@db01 /]# vgdisplay ###查看vg相关属性
--- Volume group ---
VG Name oraclevg ###vg 名称
System ID
Format lvm2 ###vg 格式
Metadata Areas 3 ### 组成vg的pv数
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0 ###创建的LV数量
Open LV 0
Max PV 0
Cur PV 3 ### 组成vg的pv数
Act PV 3
VG Size 5.99 GiB ###vg 的容量大小
PE Size 4.00 MiB ### PE大小
Total PE 1533 ###总PE数量
Alloc PE / Size 0 / 0 ###已分配PE数量
Free PE / Size 1533 / 5.99 GiB ###空闲PE数量
VG UUID izNwjZ-XBiO-UVVl-y3H6-kvM4-gFUy-CXiaD1 ###vg标识符
(3)在oraclevg上创建LV用到的命令
lvcreate [选项] [参数]
选项：L:指定逻辑卷的大小，单位“kKmMgGtT"
l:指定逻辑卷的大小，单位”LE数“
实战在oraclevg上创建LV名为lvoracle大小为2G[root@db01 /]# lvcreate -n lvoracle -L 2G oraclevg
Logical volume "lvoracle" created
[root@db01 /]# lvdisplay
--- Logical volume ---
LV Path /dev/oraclevg/lvoracle
LV Name lvoracle
VG Name oraclevg
LV UUID Npy07F-TV79-hMIE-fn7j-zboc-u63a-08iRah
LV Write Access read/write
LV Creation host, time db01, 2017-11-21 12:32:31 +0800
LV Status available
# open 0
LV Size 2.00 GiB
Current LE 512
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
(4)对lvoracle进行格式化[root@db01 /]# mkfs.ext4 /dev/oraclevg/lvoracle
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
131072 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=536870912
16 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
(5)将lvoracle挂载到/ora01[root@db01 /]# mkdir /ora01
[root@db01 /]# mount /dev/oraclevg/lvoracle /ora01/
[root@db01 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 45G 4.4G 39G 11% /
tmpfs 1004M 0 1004M 0% /dev/shm
/dev/sda1 485M 39M 421M 9% /boot
/dev/sdb2 79G 184M 75G 1% /oracle
/dev/sdb1 20G 172M 19G 1% /soft
/dev/sdd1 1007M 18M 939M 2% /alexpeng
/dev/mapper/oraclevg-lvoracle 2.0G 67M 1.9G 4% /ora01
[root@db01 /]#
(6)设置开机启动[root@db01 /]# vi /etc/fstab
UUID=3e8b0960-23d2-48f3-8661-3f24ce85e9e6 / ext4 defaults 1 1
.....
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/sdd1 /alexpeng ext4 defaults 0 0
/dev/oraclevg/lvoracle /ora01 ext4 defaults 0 0
下节祥哥讲LVM扩容，这节就不写了。想看的在博客中搜索吧。
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两个pv挂一个vg
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