Huge number of alert log entries: 'WARNING: IO Failed...' 'WARNING: failed to read mirror side 1 of virtual extent ...' (Doc ID 1274852.1)

Last updated on MAY 06, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 11-May-2014***

Symptoms

Database instance throwing large number of entries in the alert log:

...
WARNING: IO Failed. group:1 disk(number.incarnation):118.0x2ce5a485
disk_path:/dev/rhdiskasm175
AU:40573 disk_offset(bytes):42543947776 io_size:8192 operation:Read
type:synchronous
result:I/O error process_id:2658412
subsys:System iop:0x110ac00a0 bufp:0x700000296c4e000
osderr:0x434c5344 osderr1:0x0
WARNING: failed to read mirror side 1 of virtual extent 7044 logical extent 0
of file 259 in group [1.3607450813] from disk D
SKGRP1_0118 allocation unit 40573 reason error; if possible,will try another
mirror side
WARNING: IO Failed. group:1 disk(number.incarnation):118.0x2ce5a485
disk_path:/dev/rhdiskasm175
AU:40573 disk_offset(bytes):42543947776 io_size:8192 operation:Read
type:synchronous
result:I/O error process_id:2658412
subsys:System iop:0x110ac00a0 bufp:0x700000296c4e000
osderr:0x434c5344 osderr1:0x0
...


These in turn are filling up the file system where the database alert log resides and where the database creates trc files.

Cause

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