存储端划分4T的LUN后，主机端操作如下

1、主机识别，本例中hba卡的端口是host11和host12

 [root@db1 ~]#  echo "- - -" > /sys/class/scsi_host/host11/scan
 [root@db1 ~]#  echo "- - -" > /sys/class/scsi_host/host12/scan

2、fdisk查看

[root@db1 ~]# fdisk -l |grep '4398.0 GB'

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdae: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdai: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdm: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdq: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdaw: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdba: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdbo: 4398.0 GB, 4398046511104 bytes
Disk /dev/sdbs: 4398.0 GB, 4398046511104 bytes
Disk /dev/mapper/mpathq: 4398.0 GB, 4398046511104 bytes

3、编辑/etc/multipath.conf文件，添加如下内容

multipath {
        wwid 3201b09ca6700ba90
        alias newbackup
        }

4、因数据库系统运行中，直接reload多路径软件

[root@db1 ~]# service multipathd reload
[root@db1 ~]# multipath -ll
newbackup (3201b09ca6700ba90) dm-15 TOYOU,Disk-Array
size=4.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 15:0:0:21 sdm  8:192  active ready running
| |- 16:0:0:21 sdaw 67:0   active ready running
| |- 15:0:0:25 sdq  65:0   active ready running
| `- 16:0:0:25 sdba 67:64  active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 15:0:1:21 sdae 65:224 active ready running
  |- 16:0:1:21 sdbo 68:32  active ready running
  |- 15:0:1:25 sdai 66:32  active ready running
  `- 16:0:1:25 sdbs 68:96  active ready running

5、使用parted分区格式化等

[root@db1 ~]#    fdisk -l /dev/mapper/newbackup

Disk /dev/mapper/newbackup: 4398.0 GB, 4398046511104 bytes
255 heads, 63 sectors/track, 534698 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

[root@db1 ~]#  echo "Yes"|parted /dev/mapper/newbackup mklabel gpt
Information: You may need to update /etc/fstab.                           

[root@db1 ~]#   echo "Ignore"|parted /dev/mapper/newbackup mkpart backup 0%  100%
Information: You may need to update /etc/fstab.                           

[root@db1 ~]#  mkfs.ext4 /dev/mapper/newbackupp1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
268435456 inodes, 1073741312 blocks
53687065 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

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

[root@db1 ~]#   blkid
..............
..............
/dev/mapper/newbackupp1: UUID="86a73166-1db0-424b-9brf-ff366575202d" TYPE="ext4"  
 
6、在/etc/fstab文件中增加如下一行。  
UUID=86a73166-1db0-424b-9brf-ff366575202d      /backup                   ext4    defaults        0 0

[root@db1 ~]#    mount -a
[root@db1 ~]#   df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/os_root
                       99G   13G   82G  14% /
tmpfs                 126G  811M  126G   1% /dev/shm
/dev/sda2             477M   40M  412M   9% /boot
/dev/sda1             200M  264K  200M   1% /boot/efi
/dev/mapper/os-u01
                      352G   52G  320G  14% /u01
/dev/mapper/newbackupp1
                      4.0T  746G  3.1T  20% /backup