Oracle Database Administration

Some times we'll get the following warning messages in the alert log of the database continuously. Alert log message: ============== WARN: ARC2: Terminating ARCH (pid 10111) hung on a disk operation Mon May 05 22:13:32 2014 krsv_proc_kill: Killing 266287972353 processes (Process by index) Mon May 05 22:20:32 2014 ARC2: Detected ARCH process failure ARC2: STARTING ARCH PROCESSES Mon May 05 22:20:32 2014 ARC1 started with pid=21, OS id=12104 ARC1: Archival started ARC2: STARTING ARCH PROCESSES COMPLETE Mon May 05 22:20:41 2014 Deleted Oracle managed file /data/oracle/flash_recovery_area/ORCL/archivelog/2014_05_05/o1_mf_1_29497_9phnw343_.arc           Do not panic when you see the above message.  As long as there are no other side-effects this error can be ignored.  It occurs when disk IO & CPU load are high in the server.  Normally we are getting this warning messages when ever backup runs since disk io will be very high during the backup. During high disk IO