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krsv_proc_kill: Killing processes (Process by index) message in the alert log

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 & cpu load, db is also trying to archiving the file on disk, But unable to succeed the process due to above said reasons. So it is deleting the incomplete archive log from the disk automatically. 

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