Shulou(Shulou.com)06/01 Report--

The first 4K of the ASM disk head is mainly used to record disk information, which is very important. It is strongly recommended to make daily backups in the production environment.

Backup method:

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

Here / dev/oracleasm/disks/OCRVOTE is the path of the ASM diskgroup OCRVOTE disk

[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

The path of the ASM disk here is ORCL:OCRVOTE, and the corresponding actual path is / dev/oracleasm/disks/OCRVOTE, where "ORCL:" Mapping "/ dev/oracleasm/disks/"

Dd backup:

[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 backup:

[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

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