Oracle ASM failure data recovery solutions

First, the fault description
ASM disk groups dropped, ASM instance can not mount. ASM disk group with four 500G of disks, ASM and database software to 10.2.0.1, urgent need to restore oracle database.
Second, the failure analysis of
analyzing the composition of a disk ASM disk group, ASM extracted metadata, the metadata analysis: ASM store metadata damaged, making diskgroup not mount. Recombinant ASM storage, export the database file from ASM disk group, then the database file is detected, repair. If the database files intact, you can use derived from the ASM disk group database file to start the database. If the database file is damaged, it parses the underlying database file, import the data into the new database, to recover data.
Third, the recovery process
an underlying metadata acquiring ASM, recombinant ASM memory
2 using the analysis tool North ASM, ASM parsing structure, the data file obtained in ASM

3 files using the detection means to the North oracle database file ASM disk group is detected

4 North oracle using analytical tools to parse the data records of all data files, according to user imported into the new database

Fourth, restore the result
of recombinant ASM storage space, the underlying analytical ASM disk, export the database file. Parsing the underlying database files by user import the data into the new database, checks the authentication data by way of the data table, the data recovery success.