ORA-27603: Cell storage I/O error, I/O failed on disk ORA-27626: Exadata error:

Thu Nov 05 09:30:41 2015
Errors in file /u01/PROD/db/tech_st/11.2.0/admin/PROD_erpdb/diag/rdbms/prod/PROD2/trace/PROD2_lmon_68224.trc: Errors in file /u01