ASM磁盘头的前4K主要用来记录磁盘的信息，非常重要，强烈建议生产环境上做好日常备份。

备份方法：

1、 dd if=/dev/oracleasm/disks/OCRVOTE  of=/backup/asmdiskheader_backup_ocrvote.txt bs=4096 count=1

2、 kfed read  /dev/oracleasm/disks/OCRVOTE  >  /backup/asmdiskheader_bak_ocrvote_kfed.bak bs=4096 count=1

这里/dev/oracleasm/disks/OCRVOTE是ASM磁盘组OCRVOTE盘的路径

[grid@rac1 ~]$ sqlplus /nolog

SQL> conn /as sysasm

Connected.

SQL> col name for a30

SQL> col path for a30

SQL> select name,path from v$asm_disk;

NAME                           PATH

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

DATA                           ORCL:DATA

FRA                              ORCL:FRA

OCRVOTE                     ORCL:OCRVOTE

这里的ASM盘的路径为ORCL:OCRVOTE，对应的实际路径在/dev/oracleasm/disks/OCRVOTE,这里"ORCL:"映射"/dev/oracleasm/disks/"

dd备份：

[grid@rac1 ~]$ dd if=/dev/oracleasm/disks/OCRVOTE of=/apps/backup/asmdiskheader_bak_OCRVOTE.txt bs=4096 count=1

1+0 records in

1+0 records out

4096 bytes (4.1 kB) copied, 7.4e-05 seconds, 55.4 MB/s

[grid@rac1 ~]$ ll /apps/backup/asmdiskheader_bak_OCRVOTE.txt

-rw-r--r-- 1 grid oinstall 4096 Mar 10 19:32 /apps/backup/asmdiskheader_bak_OCRVOTE.txt

[grid@rac1 ~]$

kfed备份：

[grid@rac1 ~]$ ll /apps/backup/asmdiskheader_kfed_bak_OCRVOTE.bak

-rw-r--r-- 1 grid oinstall 6590 Mar 10 19:35 /apps/backup/asmdiskheader_kfed_bak_OCRVOTE.bak