LVM
LVM
步骤 分区的创建和更改系统id为lvm的id 8e
[root@xx etc]# fdisk /dev/sda
P查看现有区域
Command (m for help): p
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 83 Linux
/dev/sda2 2551 4462 15358140 83 Linux
/dev/sda3 4463 4615 1228972+ 82 Linux swap / Solaris
N创建
Command (m for help): n
Command action
e extended （扩展分区）
p primary partition (1-4) （主分区）
e
Selected partition 4
First cylinder (4616-6527, default 4616):
Using default value 4616
Last cylinder or +size or +sizeM or +sizeK (4616-6527, default 6527):
Using default value 6527
P查看
Command (m for help): p
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 83 Linux
/dev/sda2 2551 4462 15358140 83 Linux
/dev/sda3 4463 4615 1228972+ 82 Linux swap / Solaris
/dev/sda4 4616 6527 15358140 5 Extended
N创建逻辑分区
Command (m for help): n
First cylinder (4616-6527, default 4616):
Using default value 4616
Last cylinder or +size or +sizeM or +sizeK (4616-6527, default 6527): +100M
创建三个
Command (m for help): P
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 83 Linux
/dev/sda2 2551 4462 15358140 83 Linux
/dev/sda3 4463 4615 1228972+ 82 Linux swap / Solaris
/dev/sda4 4616 6527 15358140 5 Extended
/dev/sda5 4616 4628 104391 83 Linux
/dev/sda6 4629 4641 104391 83 Linux
/dev/sda7 4642 4654 104391 83 Linux
t修改系统id
Command (m for help): t
Partition number (1-7): 5
Hex code (type L to list codes): 8e
Changed system type of partition 5 to 8e (Linux LVM)
修改三个
P结果
Command (m for help): p
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 83 Linux
/dev/sda2 2551 4462 15358140 83 Linux
/dev/sda3 4463 4615 1228972+ 82 Linux swap / Solaris
/dev/sda4 4616 6527 15358140 5 Extended
/dev/sda5 4616 4628 104391 8e Linux LVM
/dev/sda6 4629 4641 104391 8e Linux LVM
/dev/sda7 4642 4654 104391 8e Linux LVM
W保存
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
出现以上情况使用[root@xx etc]# partprobe （[root@xx etc]# pvscan （查看有无pv在系统上）
建立pv
[root@xx etc]# pvcreate /dev/sda{5,6,7} 将5,6,7都建立为pv（物理卷）
Physical volume "/dev/sda5" successfully created
Physical volume "/dev/sda6" successfully created
Physical volume "/dev/sda7" successfully created
查看
[root@xx etc]# pvscan
/dev/cdrom: open failed: 只读文件系统
Attempt to close device '/dev/cdrom' which is not open.
PV /dev/sda5 lvm2 [101.94 MB]
PV /dev/sda6 lvm2 [101.94 MB]
PV /dev/sda7 lvm2 [101.94 MB]
Total: 3 [305.83 MB] / in use: 0 [0 ] / in no VG: 3 [305.83 MB]
建立完成!(可用[root@xx etc]# pvdisplay查看每个pv的详细信息)
创建vg（卷用户组）
[root@xx etc]# vgcreate xiao /dev/sda{5,6} （xiao为名称 将5,6两个物理卷创建vg）
[root@xx etc]# vgscan （查看是否创建成功）
[root@xx etc]# pvscan
/dev/cdrom: open failed: 只读文件系统
Attempt to close device '/dev/cdrom' which is not open.
PV /dev/sda5 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda6 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda7 lvm2 [101.94 MB]
Total: 3 [301.94 MB] / in use: 2 [200.00 MB] / in no VG: 1 [101.94 MB]
可增加vg的容量（将7也加入到vg中）
[root@xx etc]# vgextend xiao /dev/sda7
[root@xx etc]# pvscan
/dev/cdrom: open failed: 只读文件系统
Attempt to close device '/dev/cdrom' which is not open.
PV /dev/sda5 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda6 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda7 VG xiao lvm2 [100.00 MB / 100.00 MB free]
Total: 3 [300.00 MB] / in use: 3 [300.00 MB] / in no VG: 0 [0 ]
[root@xx etc]# vgdisplay（查看lg）
创建lv（逻辑卷）
[root@xx etc]# lvcreate -L 50M -n xxiao xiao （xxiao是lv的名称 xiao是lg的名称）
[root@xx etc]# lvdisplay （查看lv）
--- Logical volume ---
LV Name /dev/xiao/xxiao
VG Name xiao
LV UUID XT135A-i1Ky-PlwI-a0ae-xk3w-4pjP-oReap6
LV Write Access read/write
LV Status available
# open 0
LV Size 52.00 MB
Current LE 13
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
创建完成！
格式化xxiao
[root@xx etc]# mkfs -t ext3 /dev/xiao/xxiao （ext3为系统类型 后面是绝对路径）
创建一个文件夹用于挂载
[root@xx /]# mkdir xxiao
挂载
[root@xx /]# mount /dev/xiao/xxiao /xiao
[root@xx /]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/sda2 15G 5.9G 7.6G 44% /
/dev/sda1 19G 178M 18G 1% /boot
tmpfs 127M 0 127M 0% /dev/shm
/dev/hdc 2.9G 2.9G 0 100% /media/RHEL_5.3 i386 DVD
/dev/hdc 2.9G 2.9G 0 100% /mnt
/dev/mapper/xiao-xxiao
51M 4.9M 43M 11% /xiao
放大lv的容量
[root@xx /]# fdisk /dev/sda 新建一个分区8
创建pv
[root@xx /]# pvcreate /dev/sda8
[root@xx /]# pvscan
/dev/cdrom: open failed: 只读文件系统
Attempt to close device '/dev/cdrom' which is not open.
PV /dev/sda5 VG xiao lvm2 [100.00 MB / 48.00 MB free]
PV /dev/sda6 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda7 VG xiao lvm2 [100.00 MB / 100.00 MB free]
PV /dev/sda8 lvm2 [101.94 MB]
Total: 4 [401.94 MB] / in use: 3 [300.00 MB] / in no VG: 1 [101.94 MB]
添加到xiao（vg）里
[root@xx /]# vgextend xiao /dev/sda8
[root@xx /]# vgdisplay（查看）
放大lv
[root@xx /]# lvextend -L +30M /dev/xiao/xxiao （增加了30m）
查看
[root@xx /]# lvdisplay
[root@xx /]# df /xiao （发现并没用生效到系统）
[root@xx /]# resize2fs /dev/xiao/xxiao （重置，使之生效）
[root@xx /]# df /xiao 再次查看 ，显示生效后的结果！