OracleASM protection tool ADHU

In 11g, asm backs up asmdiskheader in the last second block of AU1 of DiskHeader. Although this feature of automatic backup of diskheader is not available in 10.2, however, after the ADHU tool is used, the tool uses the block for the same backup purpose (ADHU completed the function of diskheader automatic backup before 10.2.0.5 ). The ADHU tool also works.

In 11g, asm backs up the asm Disk Header in the last second block of the disk header's AU 1. Although this feature of automatic backup disk header is not available in 10.2, however, after the ADHU tool is used, the tool uses the block for the same backup purpose (ADHU completed the function of automatic backup of disk header before 10.2.0.5 ). The ADHU tool also works.

In 11g, asm backs up the asm Disk Header in the last second block of the disk header's AU 1. Although this feature of automatic backup disk header is not available in 10.2, however, after the ADHU tool is used, the tool uses the block for the same backup purpose (ADHU completed the function of automatic backup of disk header before 10.2.0.5 ). The ADHU tool can also store the backup of the disk header in the local file system. The backed-up Block can be restored using the-repair Option of the adhu tool. The block backed up by the file system can be viewed using the kfed tool or restored to the disk using the dd command.

In other words, ADHU is an effective protection tool for common damage/loss of asm disk headers before 10.2.0.5.

For asm after 11.2.0.5 and 11.1.0.7, using adhu is also a good choice.

Usage:

Adhu [-dir dirname] [-repair] [-quiet] [-readonly] [-syslog mask] devname

By default, adhu backs up the disk header as a backup file in the current directory. You can use the-dir option to specify the directory to store.

Use the-repair option when you need to use adhu to fix a corrupted asm disk header.

-The quiet option filters all normal output information. If the execution is successful, no output is printed.

-The readonly option enables the disk device in read-only mode, so that the backup block will not be written, and the backup file will be written whenever possible.

-The syslog option controls whether to write results to system logs and standard output.

Devname indicates the device file of the asm disk. The backup file in the asm header is based on the device name and stored in the current directory or the directory specified by-dir.

ADHU is? A utility to examine ASM disk headers, report status, create backups, and optionally restore them when the header is too upt.

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