6 rows selected.

ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 1048576 860159 404777 0 404777 0 N ARCH/
MOUNTED NORMAL N 512 4096 1048576 30717 29791 10239 9776 0 Y CRS/
MOUNTED EXTERN N 512 4096 1048576 1638394 49590 0 49590 0 N DATA/

查一下磁盘组的情况
SQL> select name,state from v$asm_diskgroup;

NAME STATE
------------------------------ -----------
ARCH CONNECTED
CRS MOUNTED
DATA CONNECTED

查看系统的磁盘使用情况，发下了一个好信息。
不知道为什么，存储中，竟然有一块盘没有利用。那太好了，可以把它分给ASM了。
于是，下面先把这块盘查询出来。

[root@gzxkdb1 ~]# fdisk -l
Disk /dev/emcpoweree: 2147.4 GB, 2147483648000 bytes
255 heads, 63 sectors/track, 261083 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/emcpoweree doesn't contain a valid partition table
通过以上信息，锁定/dev/emcpoweree设备没有被划分使用。

对该设备进行磁盘分区
[root@gzxkdb1 ~]# fdisk /dev/emcpoweree
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

The number of cylinders for this disk is set to 261083.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-261083, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-261083, default 261083): +500G

Command (m for help): p

Disk /dev/emcpoweree: 2147.4 GB, 2147483648000 bytes
255 heads, 63 sectors/track, 261083 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/emcpoweree1 1 60789 488287611 83 Linux

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (60790-261083, default 60790):
Using default value 60790
Last cylinder or +size or +sizeM or +sizeK (60790-261083, default 261083): +500G

Command (m for help): p

Disk /dev/emcpoweree: 2147.4 GB, 2147483648000 bytes
255 heads, 63 sectors/track, 261083 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/emcpoweree1 1 60789 488287611 83 Linux
/dev/emcpoweree2 60790 121578 488287642+ 83 Linux

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (121579-261083, default 121579):
Using default value 121579
Last cylinder or +size or +sizeM or +sizeK (121579-261083, default 261083): +500G