Detailed ASM disk header information Backup

ASM Disk header information is stored in the first 4K of each disk, and the backup of this information is important for ASM recovery, and there are several ways

1. Direct do DD to back up the disk before the 4K, the disk header information is lost, DD back

Backup: DD if=/dev/raw/raw1 of=/gyj/asmheader.dd bs=4096 count=1

Recovery: DD if=/gyj/asmheader.dd OF=/DEV/RAW/RAW1

2. Use Oracle's kfed tool to back up, turn disk header information into text plaintext records, restore using kfed merge in

Backup: kfed read/dev/raw/raw1 aunum=0 blknum=0 text=raw1.txt

Recovery: kfed write/dev/raw/raw1 aunum=0 blknum=0 text=raw1.txt

3.11G Asmcmd added Md_backup,md_restore backup instructions, but this only backs up DG META structure information, and his recovery must be DG already mount, but

After import structure information, similar to Exp/imp, this method does not work for DG Damage

Backup: Asmcmd md_backup-b/gyj/asmheader.20130130.txt

Recovery: Asmcmd md_restore-t full-g dg2-i-b/gyj/asmheader.20130130.txt

Now on the online environment, I used 1, 22 kinds of backup at the same time, to ensure that the disk header information is not lost.

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