HP-UX: ASM instance reports ORA-27090: Unable To Reserve Kernel Resources For Asynchronous Disk I/O

(Doc ID 2307974.1)

Last updated on OCTOBER 04, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.5 and later
HP-UX Itanium

Symptoms

This is a Oracle Restart/Standalone Server on HP-UX. On ASM alert log following messages are coming in continuous basis. This issue could arise on Oracle Restart and Oracle Clusterware on HP-UX environments.

ASM alert.log

 

2017-09-08T00:00:08.397464-05:00
Errors in file /u01/app/grid/diag/asm/+asm/+ASM/trace/+ASM_gmon_4292.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 2
2017-09-08T01:00:06.881752-05:00
Errors in file /u01/app/grid/diag/asm/+asm/+ASM/trace/+ASM_gmon_4292.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 2
2017-09-08T01:00:06.882094-05:00
Errors in file /u01/app/grid/diag/asm/+asm/+ASM/trace/+ASM_gmon_4292.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 2
2017-09-08T02:00:04.414795-05:00
Errors in file /u01/app/grid/diag/asm/+asm/+ASM/trace/+ASM_gmon_4292.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 2

On ASM GMON trace file, the following information is recorded.

+ASM_gmon_4292.trc

*** 2017-09-08T00:08:397464-05:00
*** SESSION ID:(249.16570) 2017-09-08T00:08:397464-05:00
*** SERVICE NAME:() 2017-09-08T00:08:397464-05:00

WARNING:1 Oracle process running out of OS kernel I/O resources request_aiolimit=64 set_aiolimit=0 <<<<<<<<
doQuery: grp=1 ret=1 ctim=1766639512 qtim=4 compat=16777217 typ=1
POST Hbeat_setBg res = 12

 

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms