Recover oracle10g Full process when operating system is corrupted

Environment: ORACLE10G, operating system 5.2

The database system under the ROOTVG/oracle file system, the data file under the Datavg/oradata file system

Control files in $/oracle_home/dbs/and/oradata under two

Redo log files in $/oracle_home/dbs/and/oradata each group of log files, a total of three groups

Has the latest SPFile file backup.

1, ROOTVG damage, reinstall the operating system.

2. Install Oracle database system files

3, restore SPFile files to $/oracle_home/dbs/,

4, startup Nomount, there are error prompts, the establishment of $/oracle_base/hb052500/cdump and Udump

5, startup Nomount, there are error prompts

SQL> startup nomount
ORA-00444: background process "MMAN" failed while starting
ORA-07446: sdnfy: bad value '' for parameter . ORA-07446 sdnfy: bad value 'string' for parameter string.
Cause: The directory specified as the value for the stated parameter could not
be used.
Action: Make sure the directory you have specified is a valid directory/file
specification.

6, the establishment of pfile documents

Sql> create Pfile from SPFile;

File created.