[CentOS] Server spontaneously rebooting under RHEL-4
Benjamin J. Weiss
benjamin at birdvet.org
Tue Mar 28 05:45:57 UTC 2006
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.
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
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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