hi, hope someone can help. we've no backup.

database cannot be started. we need to recover system.dbf, or otherwise the entire database must be rebuilt.

*** 2002.
SMON: following errors trapped and ignored:
ORA-00604: error occurred at recursive SQL level 1
ORA-01115: IO error reading block from file 1 (block # 584)
ORA-01110: data file 1: '/u2/GEMS/systemxxxx.dbf'
ORA-27072: skgfdisp: I/O error
IBM AIX RISC System/6000 Error: 11: Resource temporarily unavailable