[CentOS] Server spontaneously rebooting under RHEL-4
leonard.isham at gmail.com
Tue Mar 28 10:38:10 UTC 2006
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
> 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?
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Leonard Isham, CISSP
Ostendo non ostento.
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