假设原先 /home 是单独挂载的, 还有一个 swap 分区, 现在除了根分区外, home 和 swap 都使用lvm.
因为要把 /home 和 swap 分区放到 lvm 里, 所以先 umount 掉这两个分区, 或者在 /etc/fstab 里注释掉, 然后重启.
分区阶段
这里使用 parted 操作大于 2T 的硬盘, 小于 2T 的用 fdisk 比较简单.
# 首先设置 disklabel 为 gpt
(parted) mklabel gpt
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? Yes
# 使用 print 查看当前的硬盘信息和分区表
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 2147GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt # <--- 注意这里是 GPT 了
Number Start End Size File system Name Flags
# 把整块盘全部分给一个区
(parted) mkpart primary ext4 0G -0G
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 2147GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 1049kB 2147GB 2147GB ext4 primary
# 设置分区1的 flag 为 lvm
(parted) set 1 lvm on
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 2147GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 1049kB 2147GB 2147GB ext4 primary lvm
创建 PV
root@tankywoo:~# pvscan
No matching physical volumes found
root@tankywoo:~# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
root@tankywoo:~# pvscan
PV /dev/sdb1 lvm2 [1.95 TiB]
Total: 1 [1.95 TiB] / in use: 0 [0 ] / in no VG: 1 [1.95 TiB]
root@tankywoo:~# pvdisplay
"/dev/sdb1" is a new physical volume of "1.95 TiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 1.95 TiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID Uy019B-gKNF-b3b6-1iQm-Wc8j-eu0r-Ign88Q
创建 VG
root@tankywoo:~# vgscan
Reading all physical volumes. This may take a while...
No volume groups found
root@tankywoo:~# vgcreate vg_data /dev/sdb1
Volume group "vg_data" successfully created
root@tankywoo:~# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg_data" using metadata type lvm2
root@tankywoo:~# pvscan
PV /dev/sdb1 VG vg_data lvm2 [1.95 TiB / 1.95 TiB free]
Total: 1 [1.95 TiB] / in use: 1 [1.95 TiB] / in no VG: 0 [0 ]
root@tankywoo:~# pvdisplay
--- Physical volume ---
PV Name /dev/sdb1
VG Name vg_data
PV Size 1.95 TiB / not usable 2.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 511999
Free PE 511999
Allocated PE 0
PV UUID Uy019B-gKNF-b3b6-1iQm-Wc8j-eu0r-Ign88Q
root@tankywoo:~# vgdisplay
--- Volume group ---
VG Name vg_data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.95 TiB
PE Size 4.00 MiB
Total PE 511999
Alloc PE / Size 0 / 0
Free PE / Size 511999 / 1.95 TiB
VG UUID 10ZcUK-rhuw-6msS-r7ZN-fVEB-pw7I-Tf0SQd
创建 LV
# 什么输出都没有
root@tankywoo:~# lvscan
# 创建一个大小为 500G, 名称为 lv_home 的 LV
root@tankywoo:~# lvcreate -L 500G -n lv_home vg_data
Logical volume "lv_home" created
root@tankywoo:~# lvscan
ACTIVE '/dev/vg_data/lv_home' [500.00 GiB] inherit
root@tankywoo:~# lvdisplay
--- Logical volume ---
LV Name /dev/vg_data/lv_home
VG Name vg_data
LV UUID rOJeiw-9Pjk-O7R3-vBU1-hkHt-KY67-v4ZH3O
LV Write Access read/write
LV Status available
# open 0
LV Size 500.00 GiB
Current LE 128000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:0
# 看 `Alloc PE / Size` 字段可以看出有500G被分配了
root@tankywoo:~# vgdisplay
--- Volume group ---
VG Name vg_data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.95 TiB
PE Size 4.00 MiB
Total PE 511999
Alloc PE / Size 128000 / 500.00 GiB
Free PE / Size 383999 / 1.46 TiB
VG UUID 10ZcUK-rhuw-6msS-r7ZN-fVEB-pw7I-Tf0SQd
# 可以在 `/dev` 下看到这个device了
root@tankywoo:~# ll /dev/vg_data/lv_home
lrwxrwxrwx 1 root root 7 Dec 12 17:03 /dev/vg_data/lv_home -> ../dm-0
# 删除 LV
root@tankywoo:~# lvremove /dev/vg_data/lv_home
Do you really want to remove active logical volume lv_home? [y/n]: y
Logical volume "lv_home" successfully removed
接下来可以再创建一个 lv_swap 给 4G 做 swap.
使用 LV 创建分区
# 创建 home 分区, 分区名 /home
mkfs -t ext4 -L /home /dev/vg_data/lv_home
# TODO swap 这块有warning
root@tankywoo:~# mkswap -L ksswap /dev/vg_data/lv_swap
mkswap: /dev/vg_data/lv_swap: warning: don't erase bootbits sectors
on whole disk. Use -f to force.
Setting up swapspace version 1, size = 4194300 KiB
LABEL=ksswap, UUID=58e85fcb-4480-4b68-926b-1a9aff7c55d4
root@tankywoo:~# mkswap -L ksswap -f /dev/vg_data/lv_swap
Setting up swapspace version 1, size = 4194300 KiB
LABEL=ksswap, UUID=51e64ea6-2e9e-4fcd-b883-bffbb903a6db
最后确认
# 查看分区label 等
root@tankywoo:~# blkid
/dev/sdb1: UUID="Uy019B-gKNF-b3b6-1iQm-Wc8j-eu0r-Ign88Q" TYPE="LVM2_member"
/dev/sda1: LABEL="/" UUID="ac1c1e55-aedb-45b4-8814-8061f1ea580a" TYPE="ext3"
/dev/sr0: LABEL="CDROM" TYPE="iso9660"
/dev/mapper/vg_data-lv_home: UUID="c1a747d9-131b-41c8-87f1-78221785d037" TYPE="ext4" LABEL="/home"
/dev/mapper/vg_data-lv_swap: LABEL="ksswap" UUID="51e64ea6-2e9e-4fcd-b883-bffbb903a6db" TYPE="swap"
# 挂载
root@tankywoo:~# mount -t ext4 /dev/vg_data/lv_home /home
root@tankywoo:~# swapon /dev/vg_data/lv_swap
# 查看 lv_home 是否挂在到 /home 分区
root@tankywoo:~# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.9G 1.5G 6.1G 20% /
udev 60G 12K 60G 1% /dev
tmpfs 24G 144K 24G 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 60G 0 60G 0% /run/shm
/dev/mapper/vg_data-lv_home 493G 70M 467G 1% /home
# 查看 lv_swap 是否当作 swap 起来.
root@tankywoo:~# free -mt
total used free shared buffers cached
Mem: 120883 1180 119703 0 10 165
-/+ buffers/cache: 1004 119879
Swap: 4095 0 4095
Total: 124979 1180 123799
注意 : 最后记得 update-grub !