linux上asm添加磁盘方法

划分磁盘

[root@localhost init.d]# fdisk /dev/sdd

Command (m for help): n

Command action

e   extended

p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-261, default 1): 130

Last cylinder or +size or +sizeM or +sizeK (130-261, default 261):

Using default value 261

Command (m for help): n

Command action

e   extended

p   primary partition (1-4)

p

Partition number (1-4): 2

First cylinder (1-261, default 1):

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-129, default 129):

Using default value 129

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@localhost init.d]# fdisk -l

skiping................

Disk /dev/sdd: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System

/dev/sdd1             130         261     1060290   83  Linux

/dev/sdd2               1         129     1036161   83  Linux

Partition table entries are not in disk order

[root@localhost init.d]#

创建为asm磁盘

[root@localhost init.d]# ./oracleasm createdisk VOL5 /dev/sdd1

Marking disk "VOL5" as an ASM disk: [  OK  ]

[root@localhost init.d]# ./oracleasm createdisk VOL6 /dev/sdd2

Marking disk "VOL6" as an ASM disk: [  OK  ]

创建磁盘组

[root@localhost init.d]# su - oracle

[oracle@localhost ~]$ export ORACLE_SID=+ASM

[oracle@localhost ~]$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Tue Jun 30 10:31:42 2009

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production

With the Partitioning, OLAP and Data Mining options

SQL> create diskgroup disk_group_3 normal redundancy

2  failgroup VOL6 disk 'ORCL:VOL6' name VOL6

3  failgroup VOL5 disk 'ORCL:VOL5' name vol5;

Diskgroup created.

SQL>  drop diskgroup disk_group_3 including contents;       删除磁盘组

Diskgroup dropped.

SQL>

--把asm划分磁盘加到已经存在的磁盘组里，

SQL> l

1* alter diskgroup disk_group_1 add disk 'ORCL:VOL5'

SQL> /

Diskgroup altered.

删除添加的磁盘

SQL> l

1  select group_number,disk_number,name,label,path from v$asm_disk

2*

SQL> /

GROUP_NUMBER DISK_NUMBER NAME  LABEL PATH

------------ ----------- ----- ----- ----------

0           0       VOL6  ORCL:VOL6

1           0 VOL1  VOL1  ORCL:VOL1

1           1 VOL2  VOL2  ORCL:VOL2

2           0 VOL3  VOL3  ORCL:VOL3

2           1 VOL4  VOL4  ORCL:VOL4

1           2 VOL5  VOL5  ORCL:VOL5

SQL> alter diskgroup disk_group_1 drop disk VOL5;

Diskgroup altered.

select group_number,disk_number,bytes_written/1024/1024 from v$asm_disk_stat

1 0 79.74072265625

1 1 77.85791015625

2 0 41.99072265625

2 1 41.99072265625

1 2 3.8515625

其中disk2中的vol5可以缩小到4MB;

也可以写一个resize，如果太小，会报错如下

SQL> alter diskgroup disk_group_1 resize disk VOL5 size 3M;

alter diskgroup disk_group_1 resize disk VOL5 size 3M

*

ERROR at line 1:

ORA-15032: not all alterations performed

ORA-15037: disk 'ORCL:VOL5' is smaller than mimimum of 4 MBs

SQL> c /3/4

1* alter diskgroup disk_group_1 resize disk VOL5 size 4M

SQL> /

Diskgroup altered.

其中第二组都是41MB，因此可以一次设置为50MB;

SQL> alter diskgroup disk_group_2 resize all size 50M;

Diskgroup altered.