1、添加硬盘后centos系统需要识别scsi硬盘

    识别方式：

    查看总线号

[root@controller ~]# ls /sys/class/scsi_host/

host0 host1 host2

    重新扫描scsi总线设备

    

[root@controller ~]# echo "- - -" > /sys/class/scsi_host/host0/scan

[root@controller ~]# echo "- - -" > /sys/class/scsi_host/host1/scan

[root@controller ~]# echo "- - -" > /sys/class/scsi_host/host2/scan

2、分区

    通过fdisk -l查看当前磁盘,找到添加的磁盘

    

[root@controller ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x000c4b34

DeviceBootStartEndBlocksIdSystem

/dev/sda1 * 2048 1026047 512000 83 Linux

/dev/sda2 1026048 62914559 30944256 8e Linux LVM

Disk /dev/mapper/centos-root: 29.5 GB, 29490151424 bytes, 57597952 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

3、添加逻辑卷   

 为新添加的/dev/sdb硬盘分区，将逻辑分区属性通过t选项改为linux lvm

[root@controller ~]# fdisk /dev/sdb

Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0x4aed000b.

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x4aed000b

DeviceBootStartEndBlocksIdSystem

Command (m for help): n

Partition type:

p primary (0 primary, 0 extended, 4 free)

e extended

Select (default p): e

Partition number (1-4, default 1): 2

First sector (2048-209715199, default 2048):

Using default value 2048

Last sector,+sectors or +size{K,M,G}(2048-209715199, default 209715199):

Using default value 209715199

Partition 2 of type Extended and of size 100 GiB is set

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x4aed000b

DeviceBootStartEndBlocksIdSystem

/dev/sdb2 2048 209715199 104856576 5 Extended

Command (m for help): n

Partition type:

p primary (0 primary, 1 extended, 3 free)

l logical (numbered from 5)

Select (default p): l

Adding logical partition 5

First sector (4096-209715199, default 4096):

Using default value 4096

Last sector,+sectors or +size{K,M,G}(4096-209715199, default 209715199):

Using default value 209715199

Partition 5 of type Linux and of size 100 GiB is set

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x4aed000b

DeviceBootStartEndBlocksIdSystem

/dev/sdb2 2048 209715199 104856576 5 Extended

/dev/sdb5 4096 209715199 104855552 83 Linux

Command (m for help): t

Partition number (2,5, default 5): 5

Hex code (type L to list all codes): 8e

Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x4aed000b

DeviceBootStartEndBlocksIdSystem

/dev/sdb2 2048 209715199 104856576 5 Extended

/dev/sdb5 4096 209715199 104855552 8e Linux LVM

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

4、添加逻辑卷管理  

  创建pv，将创建的pv添加到已有的pg中，修改需要扩展的lv大小，当文件系统为xfs时使用xfs_growfs，否则使用resize2fs  -f lvm命令

    

[root@controller ~]# pvcreate /dev/sdb5

Physical volume "/dev/sdb5" successfully created

[root@controller ~]# vgscan

Reading all physical volumes.This may take a while...

Found volume group "centos" using metadata type lvm2

[root@controller ~]# vgextend centos /dev/sdb5

Volume group "centos" successfully extended

[root@controller ~]# vgdisplay

---Volume group ---

VG Name centos

System ID

Format lvm2

MetadataAreas2

MetadataSequenceNo4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 2

Act PV 2

VG Size 129.50 GiB

PE Size 4.00 MiB

Total PE 33153

Alloc PE /Size7543/29.46GiB

Free PE /Size25610/100.04GiB

VG UUID exer5V-Abx9-4xi9-g2Dx-d9My-naUa-Wjqpoc

[root@controller ~]# lvdisplay

---Logical volume ---

LV Path /dev/centos/root

LV Name root

VG Name centos

LV UUID DDAigT-wIaH-0Mql-e32w-ilRr-ygN0-7fFbYm

LV Write Access read/write

LV Creation host, time localhost, 2016-04-10 22:38:23 +0800

LV Status available

# open 1

LV Size 27.46 GiB

Current LE 7031

Segments1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:0

 

---Logical volume ---

LV Path /dev/centos/swap

LV Name swap

VG Name centos

LV UUID l3Z3cv-Qkne-Q8q1-yGvO-wyww-fuNS-F1coc7

LV Write Access read/write

LV Creation host, time localhost, 2016-04-10 22:38:23 +0800

LV Status available

# open 2

LV Size 2.00 GiB

Current LE 512

Segments1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:1

[root@controller ~]# lvextend -L 100G /dev/centos/root

Size of logical volume centos/root changed from 27.46GiB(7031 extents) to 100.00GiB(25600 extents).

Logical volume root successfully resized.

[root@controller ~]# xfs_growfs /dev/centos/root

meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1799936 blks

= sectsz=512 attr=2, projid32bit=1

= crc=0 finobt=0

data = bsize=4096 blocks=7199744, imaxpct=25

= sunit=0 swidth=0 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=0

log =internal bsize=4096 blocks=3515, version=2

= sectsz=512 sunit=0 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

data blocks changed from 7199744 to 26214400

[root@controller ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/centos-root 100G 23G 78G 23% /

devtmpfs 1.9G 0 1.9G 0% /dev

tmpfs 1.9G 0 1.9G 0% /dev/shm

tmpfs 1.9G 17M 1.9G 1% /run

tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup

/dev/sda1 497M 164M 334M 33% /boot

tmpfs 378M 0 378M 0% /run/user/0