本篇文章为大家展示了oracle12c下rac如何扩容asm存储，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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基本思路：
第一步：通过multipath -ll 命令找到 要加载的共享磁盘
第二步：将找到的共享盘，添加到绑定文件中（/etc/udev/rules.d/99-oracle.rules）
第三部：su – grid sqlplus “/as sysasm” 添加到数据库磁盘组中。
create diskgroup data_dg25t external redundancy disk'/dev/data-disk05-2.5t';
multipath -ll
grid用户
create diskgroup data_dg25t external redundancy disk'/dev/data-disk05-2.5t';
[root@inmdb04 ~]# multipath -ll
mpathp (3600000e00d100000001007f4004f0000) dm-4 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 3:0:0:14 sdp 8:240 active ready running
mpatho (3600000e00d100000001007f4004d0000) dm-2 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 3:0:0:12 sdn 8:208 active ready running
3600000e00d100000001007f400100000 dm-6 FUJITSU,ETERNUS_DX400
size=2.4T features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=enabled
`- 3:0:0:9 sdk 8:160 failed ready running
mpathn (3600000e00d100000001007f4004e0000) dm-3 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 3:0:0:13 sdo 8:224 active ready running
mpatha (3600605b0073a96901c63704a1a11425f) dm-5 IBM,ServeRAID M5015
size=557G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 0:2:0:0 sda 8:0 active ready running
mpathm (3600000e00d100000001007f4000e0000) dm-0 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 3:0:0:10 sdl 8:176 active ready running
3600000e00d100000001007f400110000 dm-7 FUJITSU,ETERNUS_DX400
size=2.4T features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=enabled
`- 3:0:0:8 sdj 8:144 failed ready running
mpathl (3600000e00d100000001007f4000f0000) dm-1 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
`- 3:0:0:11 sdm 8:192 active ready running
[root@inmdb04 ~]#
简化为：
[root@inmdb04 ~]# multipath -ll
mpathp (3600000e00d100000001007f4004f0000) dm-4 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
mpatho (3600000e00d100000001007f4004d0000) dm-2 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
mpathn (3600000e00d100000001007f4004e0000) dm-3 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
mpathm (3600000e00d100000001007f4000e0000) dm-0 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
mpathl (3600000e00d100000001007f4000f0000) dm-1 FUJITSU,ETERNUS_DX400
size=1000G features='0' hwhandler='0' wp=rw
要添加的是五个盘：
mpathp (3600000e00d100000001007f4004f0000)
mpatho (3600000e00d100000001007f4004d0000)
mpathn (3600000e00d100000001007f4004e0000)
mpathm (3600000e00d100000001007f4000e0000)
mpathl (3600000e00d100000001007f4000f0000)
alter diskgroup data_dg add disk '/dev/data-disk05';
alter diskgroup data_dg add disk '/dev/data-disk06';
alter diskgroup data_dg add disk '/dev/data-disk07';
alter diskgroup data_dg add disk '/dev/data-disk08';
alter diskgroup data_dg add disk '/dev/data-disk09';
具体操作过程：
[grid@inmdb03 ~]$ sqlplus "/as sysasm"
SQL*Plus: Release 12.1.0.2.0 Production on Tue Nov 1 18:28:06 2016
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> alter diskgroup data_dg add disk '/dev/data-disk05';
Diskgroup altered.
SQL> alter diskgroup data_dg add disk '/dev/data-disk06';
Diskgroup altered.
SQL> select name,TOTAL_MB ,FREE_MB ,round((TOTAL_MB-FREE_MB)/TOTAL_MB*100,2) used_percent from v$asm_diskgroup order by used_percent desc ;
NAME TOTAL_MB FREE_MB USED_PERCENT
------------------------------ ---------- ---------- ------------
OCR_DG 15360 5432 64.64
DATA_DG 6242304 2395221 61.63
FRA_DG 1048576 583997 44.31
SQL> alter diskgroup data_dg add disk '/dev/data-disk07';
Diskgroup altered.
SQL> SQL> alter diskgroup data_dg add disk '/dev/data-disk08';
Diskgroup altered.
SQL> alter diskgroup data_dg add disk '/dev/data-disk09';
Diskgroup altered.
SQL> select name,TOTAL_MB ,FREE_MB ,round((TOTAL_MB-FREE_MB)/TOTAL_MB*100,2) used_percent from v$asm_diskgroup order by used_percent desc ;
NAME TOTAL_MB FREE_MB USED_PERCENT
------------------------------ ---------- ---------- ------------
OCR_DG 15360 5432 64.64
FRA_DG 1048576 583997 44.31
DATA_DG 9314304 5467164 41.3
SQL>
create diskgroup data_dg25t external redundancy disk'/dev/data-disk05';
这个操作后，没有显示有内容
可以看到成功挂载的新盘已在磁盘组中。
Select * from v$asm_disk;
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