oracle asm添加磁盘扩容

1.存储上面挂载lun

2.操作系统上面执行如下操作（不需重启操作系统）：
echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -  > /sys/class/scsi_host/host1/scan
..........

一步操作完成：
echo "- - -  > /sys/class/scsi_host/host**/scan  

3.编辑 /etc/multipath.conf
添加：
multipath {
              wwid                  360002ac000000000000000dd00012d32
              alias                 mpath2
                 }
     multipath {
              wwid                  360002ac0000000000000004000012d47
              alias                 mpath3
                 }

重启multipath 服务或者reload

4.格式化磁盘：
fdisk /dev/mapper/mpath2
fdisk /dev/mapper/mpath2

partprobe /dev/mapper/mpath2
partprobe /dev/mapper/mpath3

5.asmlib绑定，或是使用其它的方式：

/etc/init.d/oracleasm createdisk ASMDISK1 /dev/mapper/mpath2p1
Marking disk "ASMDISK1" as an ASM disk:                   [  OK  ]
/etc/init.d/oracleasm createdisk ASMDISK2 /dev/mapper/mpath3p1
Marking disk "ASMDISK2" as an ASM disk:                   [  OK  ]


6.确认：
/etc/init.d/oracleasm scandisks

/etc/init.d/oracleasm listdisks
ASMDISK1
ASMDISK2


如果是rac，需要在其它的节点上执行scandisks即可：
partprobe /dev/mapper/mpath2
partprobe /dev/mapper/mpath3

/etc/init.d/oracleasm scandisks
Scanning the system for Oracle ASMLib disks:               [  OK  ]
/etc/init.d/oracleasm listdisks
ASMDISK1
ASMDISK2

6.使用asmca添加磁盘：

7.查看diskgroup数据平衡进度：
sql> select * from v$asm_operation;
GROUP_NUMBER OPERA STAT      POWER     ACTUAL       SOFAR   EST_WORK   EST_RATE EST_MINUTES ERROR_CODE
------------ ----- ---- ---------- ---------- ---------- ---------- ---------- ----------- --------------------------------------------
       1 REBAL RUN         1        1       30849    2067087      7140           285
       2 REBAL WaiT      1