Thanks sanjay

I have got this error

ORA-01115: IO error reading block from file 1 (block # 14022)
ORA-01110: data file 1: '/home/oracle8/OraHome1/oradata/oradata/hungama/system01.dbf'
ORA-27091: skgfqio: unable to queue I/O
Linux Error: 5: Input/output error
Additional information: 14021

file 1 = is system data file
and the block_id is 14022 but when I query for this block to find out its segment it is giving me an error but when I query for 14021 block_id it is giving that this block is for Index I_obj2

now what should I do? Should I drop that Index and recreate it?
Shailendra