器量大者，福泽必厚
全部博文（587）
分类： LINUX
2013-08-19 10:58:49
场景：mysql的数据库目录为/data随着数据量的增加，该分区不够用了，准备添加一块ssd硬盘，扩容该分区!
下面是测试环境的整个过程：
测试环境：在原有LVM卷标上添加一块50G的新硬盘对LVM进行扩容
1、将添加的新硬盘进行分区：
fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-6527, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-6527, default 6527):
Using default value 6527
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sda: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xadc427e3
Device Boot Start End Blocks Id System
/dev/sda1 1 6527 52428096 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@lvm-test /]# fdisk -l
Disk /dev/sda: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xadc427e3
Device Boot Start End Blocks Id System
/dev/sda1 1 6527 52428096 8e Linux LVM
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0000e547
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2 26 2611 20765696 8e Linux LVM
Disk /dev/sdc: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000468eb
Device Boot Start End Blocks Id System
/dev/sdc1 1 3917 31456256 8e Linux LVM
Disk /dev/mapper/vg_lvmtest-LogVol00: 21.0 GB, 20971520000 bytes
255 heads, 63 sectors/track, 2549 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_lvmtest-LogVol01: 32.5 GB, 32497467392 bytes
255 heads, 63 sectors/track, 3950 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
2、新建PV:
[root@lvm-test /]# pvcreate /dev/sda1
Writing physical volume data to disk "/dev/sda1"
Physical volume "/dev/sda1" successfully created
[root@lvm-test /]# pvscan
PV /dev/sdb2 VG vg_lvmtest lvm2 [19.80 GiB / 0 free]
PV /dev/sdc1 VG vg_lvmtest lvm2 [30.00 GiB / 0 free]
PV /dev/sda1 lvm2 [50.00 GiB]
Total: 3 [99.80 GiB] / in use: 2 [49.80 GiB] / in no VG: 1 [50.00 GiB]
3加大VG,利用vgextend功能
[root@lvm-test /]# vgextend vg_lvmtest /dev/sda1
Volume group "vg_lvmtest" successfully extended
[root@lvm-test /]# vgdisplay
--- Volume group ---
VG Name vg_lvmtest
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 3
Act PV 3
VG Size 99.79 GiB
PE Size 4.00 MiB
Total PE 25547
Alloc PE / Size 12748 / 49.80 GiB
Free PE / Size 12799 / 50.00 GiB
VG UUID QJMQEA-k17Z-O8N8-wP3d-NsEu-G9fy-gUclGB
空闲的PE共有12799,容量为50G
4，利用lvresize来增加
[root@lvm-test /]#lvresize -l +12799 /dev/vg_lvmtest/LogVol01
Extending logical volume LogVol01 to 80.26 GiB
Logical volume LogVol01 successfully resized
[root@lvm-test /]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_lvmtest/LogVol01
LV Name LogVol01
VG Name vg_lvmtest
LV UUID ibxmqZ-1HPY-NpXz-KS1n-OzT0-XVa4-hNtvRS
LV Write Access read/write
LV Creation host, time lvm-test, 2013-08-15 16:12:22 +0800
LV Status available
# open 1
LV Size 80.26 GiB
Current LE 20547
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/vg_lvmtest/LogVol00
LV Name LogVol00
VG Name vg_lvmtest
LV UUID 0h6qFC-Jqzf-7wnP-MAu3-jrMm-Da6D-YuaG8N
LV Write Access read/write
LV Creation host, time lvm-test, 2013-08-15 16:12:40 +0800
LV Status available
# open 1
LV Size 19.53 GiB
Current LE 5000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
上面执行完之后df -h并没有查看到增加的容量如下所示：
[root@lvm-test /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_lvmtest-LogVol00
20G 975M 18G 6% /
tmpfs 939M 0 939M 0% /dev/shm
/dev/sdb1 194M 27M 158M 15% /boot
/dev/mapper/vg_lvmtest-LogVol01
30G 193M 29G 1% /data
5、执行最后一步操作：
[root@lvm-test /]# resize2fs /dev/vg_lvmtest/LogVol01
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_lvmtest/LogVol01 is mounted on /data; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 6
Performing an on-line resize of /dev/vg_lvmtest/LogVol01 to 21040128 (4k) blocks.
The filesystem on /dev/vg_lvmtest/LogVol01 is now 21040128 blocks long.
[root@lvm-test var]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_lvmtest-LogVol00
20G 992M 18G 6% /
tmpfs 939M 0 939M 0% /dev/shm
/dev/sdb1 194M 27M 158M 15% /boot
/dev/mapper/vg_lvmtest-LogVol01
80G 205M
75G 1% /data
该工具可以实现在线的扩容，不影响用户的使用！
