Oracle RAC ASM Disk Header backup Recovery and rebuild example description

SELECT * from Dba_data_files;

Col name format A15

Col failgroup format A20

Col path format A30

Oracle kfed and Kfod Tools description

1. Check V$asm_disk.header_status toverify that the disk header was in a ' member ' state. Check the status of the Asmdisk header.

Select Path,header_status from V$asm_disk;

kfed merge/dev/raw/raw5 Text=/u01/datap1disker

1.1 Compiling kfed:

[Oracle@rac2 Lib] $cd $ORACLE _home/rdbms/lib

[Oracle@rac2 lib]$ make-f ins_rdbms.mk ikfed

1.2 View kfed Location:

[Oracle@rac2 lib]$ which kfed

Mv/u01/oracle/db/rdbms/lib/kfed/u01/oracle/db/bin/kfed

1.3 kfed command uses:

[Oracle@rac2 lib]$./kfed-h--View kfed Help

Select Group_number,disk_number,mount_status,header_status,state,name,path from v$asm_disk;//--view ASM disk Groups

This column more highlights: http://www.bianceng.cnhttp://www.bianceng.cn/database/Oracle/

Select Dg.group_number "G.no", Dg.name,d.disk_number,d.mount_status,d.header_status,dg.type,d.name,d.path

From V$asm_disk D,v$asm_diskgroup DG where Dg.group_number=d.group_number;

--View from the system level:

[Oracle@rac2 ~]$ ls-lrt/dev/oracleasm/disks/*

1.4--use kfed to view ASM Disk groups:./kfed read/dev/oracleasm/disks/data1 Text=/u01/datap1.txt

2.3 Starting DD Backup

Select Name,path from V$asm_disk;

DD if=/dev/oracleasm/disks/vol1 Of=/u01/datap1header bs=4096 count=1

DD if=/dev/oracleasm/disks/vol2 Of=/u01/fraheader bs=4096 count=1

2.4 Stop ASM Instance

Sys@anqing2 (RAC2) > select Name,state,type from V$asm_diskgroup;

/u01/oracle/oracle/product/10.2.0/crs/bin/crs_stat-t-V

/u01/oracle/oracle/product/10.2.0/crs/bin/srvctl Stop instance-d orcl-i Orcl2

[Oracle@rac2 u01]$/u01/oracle/oracle/product/10.2.0/crs/bin/srvctl Stop Asm-n RAC3

2.5 Analog Diskheader Failure

[Oracle@rac2 u01]$ dd If=/dev/zero of=/dev/oracleasm/disks/vol1 bs=4096 count=1

2.6 View the Diskheader at this time with kfed

[Oracle@rac2 u01]$ kfed read/dev/oracleasm/disks/vol1

2.7 Starting ASM Instances

[Oracle@rac2 u01]$ Export ORACLE_SID=+ASM2

2.8 Restore With Previous backup

DD If=/u01/datap1header of=/dev/oracleasm/disks/vol1 bs=4096 count=1

2.9 Verifying diskheader with kfed

[Oracle@rac2 u01]$./kfed Read//dev/oracleasm/disks/vol1

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