如何进行ASM磁盘组扩展

本篇内容主要讲解“如何进行ASM磁盘组扩展”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“如何进行ASM磁盘组扩展”吧!

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今天登录EM（虚拟机练习环境），提示EM关闭状态，查看数据库，发现实例没启动。
startup 时提示 ORA-03113: end-of-file on communication channel

产看alter log中发现如下错误
-------------------------------------------------------------------
ARC0: Error 19504 Creating archive log file to '+DATA'
Errors in file /u01/app/oracle/diag/rdbms/ocpasm1/OCPASM1/trace/OCPASM1_arc1_11472.trc:
ORA-19816: WARNING: Files may exist in db_recovery_file_dest that are not known to database.
ORA-17502: ksfdcre:4 Failed to create file +DATA
ORA-15041: diskgroup "DATA" space exhausted
--------------------------------------------------------------------
startup mount 后确认DATA group剩余空间不足：

SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ ---------- ---------------------- ---------- ----------
1 DATA   MOUNTED 4000      6
2 FRA MOUNTED 3000      2946
3 OCR MOUNTED 3000      1880

于是查询asm vg 发现还有剩余空间，太好了可以扩展
[root@OCPLHR ~]# vgdisplay
--- Volume group ---
VG Name vg_oraasm
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 15.00 GB
PE Size 4.00 MB
Total PE 3839
Alloc PE / Size 3584 / 14.00 GB
Free PE / Size 1020 / 1020.00 MB
VG UUID QHMkJt-XJfQ-gL9a-antn-6jfJ-OOdH-3vSll1
--------------------------
于是添加磁盘并扩展DATA group：
dd if=/dev/zero of=/asmdisk/disk9 bs=1024k count=1000
/sbin/losetup /dev/loop9 /asmdisk/disk9
raw /dev/raw/raw9 /dev/loop9
chmod 660 /dev/raw/raw9
chown oracle:dba /dev/raw/raw9

grid>sqlplus / as sysasm
alter diskgroup DATA add disk '/dev/raw/raw9';
select operation,est_minutes from v$asm_operation; #确认冗余平衡完成

重启数据库后，数据库恢复正常。
SQL> select name,group_number,state,redundancy,total_mb,free_mb,path from v$asm_disk;

NAME GROUP_NUMBER STATE REDUNDANCY TOTAL_MB FREE_MB PATH
---------- ------------ ---------------- -------------- ---------- ---------- ------------------------------
FRA_0002 2 NORMAL UNKNOWN 1000 981 /dev/raw/raw8
FRA_0001 2 NORMAL UNKNOWN 1000 983 /dev/raw/raw7
FRA_0000 2 NORMAL UNKNOWN 1000 982 /dev/raw/raw6
DATA_0002 1 NORMAL UNKNOWN 1000 223 /dev/raw/raw5
DATA_0001 1 NORMAL UNKNOWN 1000 214 /dev/raw/raw4
DATA_0000 1 NORMAL UNKNOWN 1000 220 /dev/raw/raw3
OCR_0001 3 NORMAL UNKNOWN 1000 940 /dev/raw/raw2
OCR_0000 3 NORMAL UNKNOWN 1000 940 /dev/raw/raw1
DATA_0003 1 NORMAL UNKNOWN 1000 248 /dev/raw/raw9

最后发现 EM没启动
emctl status dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.3.0
Copyright (c) 1996, 2011 Oracle Corporation. All rights reserved.
https://OCPLHR:1158/em/console/aboutApplication
Oracle Enterprise Manager 11g is not running.

手动启动EM：
emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.3.0
Copyright (c) 1996, 2011 Oracle Corporation. All rights reserved.
https://OCPLHR:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ..... started.
Logs are generated in directory /u01/app/oracle/product/11.2.0/dbhome_1/OCPLHR_OCPASM1/sysman/log。

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