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使用LVM合并三个硬盘并挂载到home目录

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目标：服务器里有三个硬盘，想要把三个硬盘合成一个盘，作为home目录，用于存储数据。

1、建立LVM卷

使用fdisk -l命令查看机器的物理磁盘

可以看到有三个硬盘分别为/dev/sdb1, /dev/sdc1, /dev/sdd1

使用pvcreate将三个物理磁盘加入物理卷

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$ pvcreate  /dev/sdb1
 Physical volume "/dev/sdb1" successfully created
$ pvcreate  /dev/sdc1
 Physical volume "/dev/sdc1" successfully created
$ pvcreate  /dev/sdd1
 Physical volume "/dev/sdd1" successfully created

创建逻辑卷组diskgroup，并将/dev/sdc1和/dev/sdd1加入其中

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$ vgcreate diskgroup /dev/sdb1
  Volume group "diskgroup" successfully created
$ vgextend diskgroup /dev/sdc1
  Volume group "diskgroup" successfully extended
$ vgextend diskgroup /dev/sdd1
  Volume group "diskgroup" successfully extended

使用pvdisplay查看/dev/sdb /dev/sdc的Free PE

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$ pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               diskgroup
  PV Size               931.51 GiB / not usable 4.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238466
  Free PE               0
  Allocated PE          238466
  PV UUID               eyz1EB-nqCw-LHi2-VvAh-KWQw-QhEP-JgpHSL
   
  --- Physical volume ---
  PV Name               /dev/sdc1
  VG Name               diskgroup
  PV Size               298.09 GiB / not usable 1.84 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              76310
  Free PE               0
  Allocated PE          76310
  PV UUID               gAT2xS-dv3c-y8uj-9MAF-WV0d-RxCc-cVFuUC
   
  --- Physical volume ---
  PV Name               /dev/sdd1
  VG Name               diskgroup
  PV Size               298.09 GiB / not usable 4.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              76310
  Free PE               0
  Allocated PE          76310
  PV UUID               l045Td-ABgH-9DSv-ymg4-82gj-wXs9-MNb2QG

使用vgdisplay查看两块物理磁盘合并后的Free PE SIZE大小通用为391086

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$ vgdisplay
  --- Volume group ---
  VG Name               diskgroup
  System ID             
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               1.49 TiB
  PE Size               4.00 MiB
  Total PE              391086
  Alloc PE / Size       391086 / 1.49 TiB
  Free  PE / Size       0 / 0   
  VG UUID               7HUui6-rRDa-24io-tiS0-fIB6-KCaP-EaeJ9z

然后创建卷：lvcreate -l +391086 -n vg01 diskgroup ，其中391086为Free PE SIZE的大小，diskgroup 为创建的卷组名

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$ lvcreate -l +391086 -n vg01 diskgroup
 Logical volume "vg01" created

使用lvdisplay命令获取到LV Path /dev/diskgroup/vg01，并使用mkfs命令对其进行格式化

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$ lvdisplay
  --- Logical volume ---
  LV Path                /dev/diskgroup/vg01
  LV Name                vg01
  VG Name                diskgroup
  LV UUID                671ZPP-uXtN-lmoz-N2oU-WdTT-xONu-W3aknc
  LV Write Access        read/write
  LV Creation host, time weixin-System-Product-Name, 2018-12-07 20:28:55 +0800
  LV Status              available
  # open                 1
  LV Size                1.49 TiB
  Current LE             391086
  Segments               3
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
$ mkfs -t ext4 /dev/diskgroup/vg01

2、挂载到home目录

新建一个home1目录

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$ cd /
$ mkdir /home1

挂载

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$ mount /dev/diskgroup/vg01 /home1

移动home目录下的所有东西到home1

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$ mv /home/* /home1/

删除home目录，卸载vg01，将home1重命名为home，重新挂载

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$ rm -r home
$ umount home1
$ mv home1 home
$ mount /dev/diskgroup/vg01 /home

3、设置开机挂载

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$ vi /etc/fstab

在文件末尾加上以下内容 

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/dev/diskgroup/vg01 /home ext4 defaults 0 1