由于需要重建Stream，导出使用的是expdp,源库版本为10.2.0.1（目标库11.2.0.2），10g中expdp的COMPRESSION效果不好，导出来的dmp比较大，有450G左右，而本地磁盘空间不够只有400左右，查看ASM空间还有很多空闲空间，下面操作为从Oracle ASM中分出来一个100G左右的LUN给本地文件系统使用
1 操作环境
操作系统版本：AIX 6.1
数据库版本：Oracle 11.2.0.2 RAC
2 查看asm磁盘的大小
SQL> select t.name,t.GROUP_NUMBER,t.OS_MB,t.TOTAL_MB,t.FREE_MB,t.PATH from v$asm_disk t where path like '%arch%';
NAME GROUP_NUMBER OS_MB TOTAL_MB FREE_MB PATH
------------- -------- ------ ---------- ---------- ---------------------------------
ARCHDG_0000 1 102400 102400 102374 /dev/archdisk1
ARCHDG_0001 1 102400 102400 102375 /dev/archdisk2
ARCHDG_0002 1 102400 102400 102375 /dev/archdisk3
ARCHDG_0003 1 102400 102400 102375 /dev/archdisk4
ARCHDG_0004 1 102400 102400 102374 /dev/archdisk5
18 rows selected
SQL>
3 查看对应的磁盘
计划把/dev/archdisk5卸载用于文件系统，查看对应的磁盘,设备号为19
bash-3.00# ls -lrt /dev/archdisk5
crw-rw---- 1 grid asmdba 23, 19 Apr 20 22:00 /dev/archdisk5
bash-3.00#
再看一下对应的磁盘，可以看到ASM使用了下面磁盘,设备号23,19对应的磁盘为/dev/rhdisk19
bash-3.00# ls -lrt /dev/rhdisk*
…….(省略部分磁盘)
crw------- 1 root system 23, 19 Jun 06 2011 /dev/rhdisk19
crw------- 1 root system 23, 20 Jun 06 2011 /dev/rhdisk20
crw------- 1 root system 23, 21 Jun 06 2011 /dev/rhdisk21
crw------- 1 root system 23, 22 Jun 06 2011 /dev/rhdisk22
crw------- 1 root system 23, 23 Apr 22 10:19 /dev/rhdisk23
再次验证设备号,对应的磁盘为hdisk19
bash-3.00# ls -lrt |grep '23, 19'
crw------- 1 root system 23, 19 Jun 06 2011 rhdisk19
brw------- 1 root system 23, 19 Jun 06 2011 hdisk19
crw-rw---- 1 grid asmdba 23, 19 Apr 20 22:00 archdisk5
bash-3.00#
查看磁盘的对应情况,对应的磁盘为hdisk19
bash-3.00# lspv
……….(省略部分PV)
hdisk19 none None
hdisk20 00f6a21d6a03bb66 bkvg active
hdisk21 00f6a21d6a03bbc9 bkvg active
hdisk22 00f6a21d6a03bc2b bkvg active
hdisk23 00f6a21d2f863681 bkvg active
4 删除ASM磁盘
根据上面查询/dev/archdisk5对应的ASM里面的disk_name为ARCHDG_0004，这个LUN刚好100G左右,查看对应的diskgroup名称
SQL> select name,total_mb,free_mb from v$asm_diskgroup where group_number=1;
NAME TOTAL_MB FREE_MB
-------------------- ---------- ----------
ARCHDG 512000 511873
SQL>
bash-3.00# su - grid
grid@circdb1>bash
bash-3.00$ sqlplus "/as sysasm"
SQL*Plus: Release 11.2.0.2.0 Production on Mon Apr 22 11:12:32 2013
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> ALTER DISKGROUP ARCHDG DROP DISK ARCHDG_0004;
Diskgroup altered.
SQL>
在操作过程中可以通过V$ASM_DISK.HEADER_STATUS查看状态，在数据平衡过程中可以查看V$ASM_OPERATION 可以查看进度
select HEADER_STATUS from V$ASM_DISK where name='ARCHDG_0004';
select * from V$ASM_OPERATION ;
下面为执行成功后的结果HEADER_STATUS的状态为FORMER,组和磁盘数都为0
SQL> select t.GROUP_NUMBER,t.DISK_NUMBER,t.MOUNT_STATUS,t.HEADER_STATUS,t.PATH from V$ASM_DISK t where path like '%archdisk5%' ;
GROUP_NUMBER DISK_NUMBER MOUNT_STATUS HEADER_STATUS PATH
------------ ----------- ------------ ------------- --------------------------------------------------------------------------------
0 0 CLOSED FORMER /dev/archdisk5
SQL>
5 加入文件系统
删除hdisk19对应的索引节点，也就是/dev/archdisk5,这样可以解除asm过程对这个磁盘的锁定
bash-3.00# cd /dev/
bash-3.00# ls -lrt archdisk5
crw-rw---- 1 grid asmdba 23, 19 Apr 20 22:00 archdisk5
bash-3.00# rm archdisk5
bash-3.00# ls -lrt archdisk5
ls: 0653-341 The file archdisk5 does not exist.
bash-3.00#
把磁盘加入到文件系统中，注意这种系统级别的操作都是使用root
bash-3.00# smit extendvg
Add a Physical Volume to a Volume Group
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
Force the creation of a volume group? no +
* VOLUME GROUP name [bkvg] +
* PHYSICAL VOLUME names [hdisk19] +
Command: running stdout: yes stderr: no
Before command completion, additional instructions may appear below.
0516-1339 /usr/sbin/extendvg: Physical volume contains some 3rd party volume group.
0516-1397 /usr/sbin/extendvg: The physical volume hdisk19, will not be added to
the volume group.
0516-792 /usr/sbin/extendvg: Unable to extend volume group.
根据上面报错，在网上看到的解决方案为使用dd清理磁盘信息
bash-3.00# dd if=/dev/zero/ f=/dev/rhdisk19 bs=1024 count=10
10+0 records in.
10+0 records out.
bash-3.00# smit extendvg
Add a Physical Volume to a Volume Group
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
Force the creation of a volume group? no +
* VOLUME GROUP name [bkvg] +
* PHYSICAL VOLUME names [hdisk19] +
Command: running stdout: yes stderr: no
Before command completion, additional instructions may appear below.
0516-1254 /usr/sbin/extendvg: Changing the PVID in the ODM.
0516-1397 /usr/sbin/extendvg: The physical volume hdisk19, will not be added to
the volume group.
0516-792 /usr/sbin/extendvg: Unable to extend volume group.
执行上面操作后又报了另一个错，于是把数据库重启后再操作，这个时间发现成功了
COMMAND STATUS
Command: OK stdout: yes stderr: no
Before command completion, additional instructions may appear below.
0516-1254 /usr/sbin/extendvg: Changing the PVID in the ODM.
下面显示磁盘空间已释放
bash-3.00# lsvg bkvg
VOLUME GROUP: bkvg VG IDENTIFIER: 00f6a21d00004c00000001306a03bc53
VG STATE: active PP SIZE: 64 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 7990 (511360 megabytes)
MAX LVs: 256 FREE PPs: 69 (4416 megabytes)
LVs: 2 USED PPs: 7921 (506944 megabytes)
OPEN LVs: 2 QUORUM: 3 (Enabled)
TOTAL PVs: 5 VG DESCRIPTORS: 5
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 5 AUTO ON: yes
MAX PPs per VG: 32768 MAX PVs: 1024
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
PV RESTRICTION: none
bash-3.00#
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