parted LVM划分4T磁盘，在线扩展1.5T

磁盘分区：
parted /dev/emcpowera
(parted) print
Model: Unknown (unknown)
Disk /dev/emcpowera: 4398GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

(parted) mklabel gpt
Warning: The existing disk label on /dev/emcpowera will be destroyed and all
data on this disk will be lost. Do you want to continue?
Yes/No? yes
(parted) mkpart primary 0 4398GB
Warning: The resulting partition is not properly aligned for best performance.

Ignore/Cancel? i
(parted) print
Model: Unknown (unknown)
Disk /dev/emcpowera: 4398GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

(parted) set 1 lvm on
(parted) print
Model: Unknown (unknown)
Disk /dev/emcpowera: 4398GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 17.4kB 4398GB 4398GB primary lvm

# partprobe /dev/emcpowera

创建pv（实体分割区）
[root@gps ~]# pvcreate -v /dev/emcpowera1
Set up physical volume for "/dev/emcpowera1" with 8589934525 available sec
tors Zeroing start of device /dev/emcpowera1
Writing physical volume data to disk "/dev/emcpowera1"
Physical volume "/dev/emcpowera1" successfully created
[root@gps ~]# pvdisplay
"/dev/emcpowera1" is a new physical volume of "4.00 TiB"
--- NEW Physical volume ---
PV Name /dev/emcpowera1
VG Name
PV Size 4.00 TiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID rXInos-ERGY-PtRM-3gdO-iuTc-FjUq-MsuOEK

[root@gps ~]# vgcreate -s 4M vg01 /dev/emcpowera1
Volume group "vg01" successfully created
[root@gps ~]# vgdisplay
--- Volume group ---
VG Name vg01
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 4.00 TiB
PE Size 4.00 MiB
Total PE 1048575
Alloc PE / Size 0 / 0
Free PE / Size 1048575 / 4.00 TiB
VG UUID iLibwY-3PzY-msgG-SX0y-zWVf-1eXj-iAN2FU

[root@gps ~]# lvcreate -l 100%FREE -n lv01 vg01
Logical volume "lv01" created
[root@gps ~]# mkfs.ext4 /dev/vg01/lv01
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
268435456 inodes, 1073740800 blocks
53687040 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
32768 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848, 512000000, 550731776, 644972544

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

[root@gps ~]# mkdir /4t
[root@gps ~]# mount /dev/vg01/lv01 /4t
[root@gps ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 252G 91G 149G 39% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda2 190M 54M 127M 30% /boot
/dev/sda1 200M 260K 200M 1% /boot/efi
/dev/mapper/vg01-lv01 4.0T 67M 3.8T 1% /4t
[root@gps ~]# mount
/dev/sda4 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda2 on /boot type ext4 (rw)
/dev/sda1 on /boot/efi type vfat (rw,umask=0077,shortname=winnt)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/dev/mapper/vg01-lv01 on /4t type ext4 (rw)

扩展1.5T
[root@gps ~]# fdisk /dev/emcpowerb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x16fa8030.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

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 (1-195812, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-195812, default 195812):
Using default value 195812

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/emcpowerb: 1610.6 GB, 1610612736000 bytes
255 heads, 63 sectors/track, 195812 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: 0x16fa8030

Device Boot Start End Blocks Id System
/dev/emcpowerb1 1 195812 1572859858+ 8e Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

[root@gps ~]# pvcreate /dev/emcpowerb1
Physical volume "/dev/emcpowerb1" successfully created
[root@gps ~]# vgextend vg01 /dev/emcpowerb1
Volume group "vg01" successfully extended
[root@gps ~]# vgdisplay
--- Volume group ---
VG Name vg01
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 5.46 TiB
PE Size 4.00 MiB
Total PE 1432573
Alloc PE / Size 1048575 / 4.00 TiB
Free PE / Size 383998 / 1.46 TiB
VG UUID iLibwY-3PzY-msgG-SX0y-zWVf-1eXj-iAN2FU

[root@gps ~]# lvextend -l +100%FREE /dev/vg01/lv01
Extending logical volume lv01 to 5.46 TiB
Logical volume lv01 successfully resized

[root@gps ~]# e2fsck -f /dev/vg01/lv01
e2fsck 1.43-WIP (20-Jun-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
blocks
[root@gps ~]# resize2fs /dev/vg01/lv01
resize2fs 1.43-WIP (20-Jun-2013)
Resizing the filesystem on /dev/vg01/lv01 to 1466954752 (4k) blocks.
The filesystem on /dev/vg01/lv01 is now 1466954752 blocks long.

[root@gps ~]# mount /dev/vg01/lv01 /4t
[root@gps ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 252G 91G 149G 39% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda2 190M 54M 127M 30% /boot
/dev/sda1 200M 260K 200M 1% /boot/efi
/dev/mapper/vg01-lv01 5.4T 58M 5.2T 1% /4t
[root@gps ~]# mount
/dev/sda4 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda2 on /boot type ext4 (rw)
/dev/sda1 on /boot/efi type vfat (rw,umask=0077,shortname=winnt)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/dev/mapper/vg01-lv01 on /4t type ext4 (rw)

增加lv（在分区空间足够的情况下）
这里，我们新添加一块磁盘sdc20G，前期磁盘分区操作省略
[root@localhost /]# umount /lv01 先卸载
[root@localhost /]# pvcreate /dev/sdc1 增加pv实体分割区
[root@localhost /]# vgextend vg01 /dev/sdc1 将新加PV加入原有的VG01上
[root@localhost /]# lvextend -l 5120 /dev/vg01/lv01 增加lv
[root@localhost /]# resize2fs /dev/vg01/lv01 手动
[root@localhost /]# mount /dev/vg01/lv01 /lv01
[root@localhost /]# df -h

减少lv
[root@localhost /]# umount /lv01
[root@localhost /]# fsck -f /dev/vg01/lv01
[root@localhost /]# resize2fs /dev/vg01/lv01 102400这里更改文件系统指定大小要和lvreduce必须一致
[root@localhost /]# lvreduce -L 102400M /dev/vg01/lv01
（减小大小，要计算好，而且稍不注意，就可能让系统崩溃