[CentOS] Server spontaneously rebooting under RHEL-4

[Benjamin J. Weiss]

Sorry, yeah, I guess I could call RedHat support, since we're paying 
them. :)  It's just that I've always been so impressed with the knowlege 
and helpfulness of the folks here that I thought I'd give it a shot 
before turning somewhere else.

I'll see if I can get my boss to allow me to update to the latest OS 
patches and BIOS to see if this will fix stuff.

Ben

Craig White wrote:

>you are aware of the support resources available for RHEL and Oracle
>right? There also is a nahant-list which is Red Hat's mail list for
>RHEL-4
>
>Just wanting to point out the perhaps more logical places to seek
>assistance though I am sure that the CentOS team is flattered by your
>asking for help on this list.
>
>Craig
>
>On Tue, 2006-03-28 at 08:16 -0600, Benjamin J. Weiss wrote:
>  
>
>>Sorry, it's an HP/Compaq ML-530.  It didn't do this until I changed the 
>>OS, so I doubt that it's a BIOS issue.
>>
>>Thanks!
>>
>>Leonard Isham wrote:
>>
>>    
>>
>>>On 3/28/06, Benjamin J. Weiss <benjamin at birdvet.org> wrote:
>>> 
>>>
>>>      
>>>
>>>>Hey, y'all! :)
>>>>
>>>>I've got an RHEL-4 server (yep, I know it's not CentOS, but hey we gotta
>>>>send some money RH's way to keep CentOS up and going! ) that's running
>>>>Oracle 10g.  This same hardware worked just fine for over a year running
>>>>RHEL-AS-2.1 and Oracle 9i.  Now we're getting spontaneous reboots when
>>>>running oracle processes that eat up a bunch of resources.  I don't know
>>>>where to go from here.
>>>>   
>>>>
>>>>        
>>>>
>>>I didn't see a mention of the hardware type, but some systems have a
>>>BIOS setting to reboot if the hardware doesn't detecet any "activity"
>>>for a period of time.  Check for that setting and disable that
>>>feature.  This may solve the issue. If not at least let you see the
>>>crash if there is one.
>>>
>>> 
>>>
>>>      
>>>
>>>>It's got dual hyper-threading processors set to hyperthreading mode, and
>>>>I understand that the 2.6 kernel used to have HT issues, but I thought
>>>>that'd been solved.  The kernel we're running is:  2.6.9-22.0.2.ELsmp
>>>>(yeah, not the latest, I haven't had a chance lately to test and update
>>>>the patches).
>>>>
>>>>I think the kernel settings are correct, what with 4gigs of ram:
>>>>
>>>>[root at sibrsdbs etc]# cat sysctl.conf
>>>># Kernel sysctl configuration file for Red Hat Linux
>>>>#
>>>># For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
>>>># sysctl.conf(5) for more details.
>>>>
>>>># Controls IP packet forwarding
>>>>net.ipv4.ip_forward = 0
>>>>
>>>># Controls source route verification
>>>>net.ipv4.conf.default.rp_filter = 1
>>>>
>>>># Do not accept source routing
>>>>net.ipv4.conf.default.accept_source_route = 0
>>>>
>>>># Controls the System Request debugging functionality of the kernel
>>>>kernel.sysrq = 0
>>>>
>>>># Controls whether core dumps will append the PID to the core filename.
>>>># Useful for debugging multi-threaded applications.
>>>>kernel.core_uses_pid = 1
>>>>
>>>># oracle settings
>>>>kernel.shmall = 2097152
>>>>kernel.shmmax = 2147483648
>>>>kernel.shmmni = 4096
>>>>kernel.sem = 250 32000 100 128
>>>>#fs.file-max = 65536
>>>>net.ipv4.ip_local_port_range = 1024 65000
>>>>net.core.rmem_default=262144
>>>>net.core.wmem_default=262144
>>>>net.core.rmem_max=262144
>>>>net.core.wmem_max=262144
>>>>
>>>>
>>>>I don't know how to look for the core dump, if there was one.  I don't
>>>>see anything named 'core' in the /root directory.
>>>>
>>>>I'm sucking wind, any suggestions?
>>>>
>>>>Thanks!
>>>>
>>>>Ben
>>>>_______________________________________________
>>>>CentOS mailing list
>>>>CentOS at centos.org
>>>>http://lists.centos.org/mailman/listinfo/centos
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>--
>>>Leonard Isham, CISSP
>>>Ostendo non ostento.
>>>_______________________________________________
>>>CentOS mailing list
>>>CentOS at centos.org
>>>http://lists.centos.org/mailman/listinfo/centos
>>>
>>> 
>>>
>>>      
>>>
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>>    
>>
>
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>