Recovery data after crash DISK

Hi,
Instance PROD
AIX 5.2
DB 10.2.0.4
Suddenly database server disk crashed.
AIX teams are trying to recover the disk. My question is after recover the disk by AIX admin what steps to follow to make consistent database at DBA side. What issues could arise to come out at the side of database after recover the disk or replace the disk.
Thanks

is the disk full?
--97% full(35 gB free)
is disk available.
--yes disk is available.
I am not able to connect to database with sys user(find below error) but from dev14 user it is connecting and some query is running some not.
while trying to sys user
Enter user-name: sys as sysdba
Enter password:
ERROR:
ORA-09925: Unable to create audit trail file
IBM AIX RISC System/6000 Error: 89: Invalid file system control data detected
Additional information: 9925
ORA-09925: Unable to create audit trail file
IBM AIX RISC System/6000 Error: 89: Invalid file system control data detected
Additional information: 9925
Enter user-name: dev12
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select count(*) from dba_free_space;
select count(*) from dba_free_space
ERROR at line 1:
ORA-01115: IO error reading block from file 43 (block # 3)
ORA-01110: data file 43: '/vol04/oracle/oradata/index21.dbf'
ORA-27091: unable to queue I/O
ORA-27072: File I/O error
IBM AIX RISC System/6000 Error: 5: I/O error
Additional information: 7
Additional information: 2
Additional information: -1
SQL> select open_mode from v$database;
OPEN_MODE
READ WRITE
what clues exist within /val/log/messages file?
---Where can i get it?

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