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Old 12-15-2010, 03:28 PM   #1
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oracle 11g install prerequisite fails for valid rhel 4 kernel parameter value

Okay I have never had this happen before. Installing Oracle 11gR2 client
on RHEL 4 x86 and prereq for semmni fails to recognize Linux value.
Initially there were six other kernel parameters that failed and I reset
them in the /etc/sysctl.conf file, ran sysctl -p, and no problem passing
on the second try except for semmni. The value is:
>/sbin/sysctl -a | grep sem
kernel.sem = 250 32000 100 128
> cat /proc/sys/kernel/sem
250 32000 100 128
RHEL version
> uname -a
Linux semele 2.6.9-67.0.20.ELsmp #1 SMP Wed Jun 18 12:40:47
EDT 2008 i686 i686 i386 GNU/Linux
> cat /etc/issue
Red Hat Enterprise Linux AS release 4 (Nahant Update 8)

Oracle installer says expected value is 128 and actual value 0. I have
successfully installed the client on another Linux server with the
same basic install with no problems. Oracle support suggests a reboot.
Is there any reason Linux shows the parameter but Oracle cannot see it?
Oracle sees the other 3 parameters: SEMMSL, SEMMNS, SEMOPM
Is this value stored anywhere else on Linux? Do you agree that a reboot
might fix this?

Thank you,
ozark dba
Old 12-15-2010, 03:34 PM   #2
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Registered: Mar 2004
Distribution: SusE 8.2
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Q: Do you agree that a reboot might fix this?
A: Yes

Here are two good links:

Failing all else, you can always run "-ignoreSysPrereqs". But this is NOT a good idea, if you have any other options:

I do not recommend to execute "runInstaller -ignoreSysPrereqs" since this will disable other checks you probably don't want to.
There's always MySql

Oh! Wait! MySQL is now owned by that same Larry Ellison guy that owns Oracle. Oh well...

Last edited by paulsm4; 12-15-2010 at 09:55 PM.
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Old 12-16-2010, 08:04 AM   #3
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Thanks for reply. I agree that we do not want to ignore prereqs as this is our production application server running Client 10gR2. We are installing Client 11gR2 in conjunction with database upgrade in Feb 2011. If reboot solves the issue, then happy days are here again! However, if it does not, and all other pre-reqs pass, if I ignore just the semmni parameter and then install Oracle, I wonder what the risk is for later issues.
Old 12-20-2010, 12:19 PM   #4
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Oracle Support just told me to ignore the semmni prarmeter failure for Client 11gR2. So as long as it is the only one failing I will install with the "ignore" option for that parameter only
Old 12-21-2010, 02:53 PM   #5
Registered: Feb 2008
Location: Sacramento
Distribution: RHEL AS, mostly
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Thumbs up Me too

Just to help add a warm fuzzy feeling to that solution from Oracle, we have been ignoring that warning on large RHEL4 and RHEL5 systems for a couple of years now with no ill effects.
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Old 12-21-2010, 04:19 PM   #6
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Thanks I do appreciate the reply.


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