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Linux Distribution Details
OSOEL 5 Update 2 x86_64
Kernelkernel-xen-2.6.18-92.1.17.0.2.el5.x86_64.rpm or higher
Virtualization TypeParavirtualized
 
Filesystems Tested
File SystemMount OptionsDetails
ext3NoneFor single instance database files.
Configuration Files
Comments
/etc/modprobe.confalias scsi_hostadapter xenblk -
  alias eth0 xennet -
/etc/security/limits.conforacle soft core unlimited -
 oracle soft nproc 131072 -
 oracle hard nproc 131072 -
 oracle soft nofile 131072# depending on size of db, these may need to be larger
 oracle hard nofile 131072 -
 oracle hard core unlimited -
/etc/selinux/configSELINUX=disabledRefer Bug Nos.: 6079461, 6081490
/etc/sysctl.confnet.core.wmem_default=262144 -
 net.core.wmem_max=262144 -
 fs.aio-max-nr=3145728 -
 net.ipv4.ip_local_port_range=1024 65000 -
 kernel.shmmax=1073741824#Set to a value half the size of physical memory
 net.core.rmem_max=4194304# rmem_max can be tuned based on workload to balance performance vs lowmem usage
 net.core.rmem_default=262144# rmem_default can be tuned based on workload to balance performance vs lowmem usage
 kernel.sysrq=1 -
 kernel.shmall=3279547 -
 kernel.shmmni=4096 -
 kernel.sem=250 32000 100 142 -
 kernel.msgmax=8192 -
 kernel.msgmni=2878 -
 fs.file-max=327679 -
 kernel.msgmnb = 65536 -
Miscellaneous
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Oracle Software
OracleOracle Database 10g Release 2, Single Instance and Oracle Real Application Clusters (RAC) for Linux x86_64
Version10.2.0.3
Patch5452672
 
Configuration Feedback
Bug No6045759
SummaryApplications using random numbers may hang or report errors if there is insufficient random data in the system
AffectsOracle applications tools (e.g: java apps) requesting random data
SymptomsOracle applications tools (e.g: java apps) requesting random data from /dev/random either hang or print out the following information message: Not enough random bytes available. Please do some other work to give the OS a chance to collect more entropy!
SolutionIf using e1000 or bnx2 network drivers on OEL5 the entropy=1 module option can be set for either of these drivers in /etc/modprobe.conf. Fixed in 2.6.18-8.0.0.4.1.el5 kernel or higher
 
Bug No6075960
SummaryIf an ORACLE_HOME resides on an nfs partition, a reboot while Oracle is running may cause a panic
AffectsOracle deployments with Oracle_home on an nfs partition
SymptomsIf the ORACLE_HOME resides on an nfs partition and the system is rebooted while an Oracle instance is still running, the system may panic. This does not cause a data corruption, but the system will need to be restarted
SolutionFixed in 2.6.18-53.0.0.0.1.el5 kernel or higher. For other kernel versions lower than this, please shutdown the database instance before reboot of the server.
 
Bug No6079461
SummaryOCI program fails to execute with error: LIBNNZ10.SO: cannot restore segment prot after reloc: Permission denied
AffectsOCI programs when selinux is enabled.
SymptomsIf selinux is enabled, running an OCI application may fail with the following error: libnnz10.so: cannot restore segment prot after reloc: Permission denied
SolutionDisable selinux(either via the selinux=0 boot option or by setting SELINUX=disabled in /etc/sysconfig/selinux)
 
Bug No6081490
SummaryWith selinux enabled, ocfs2 fails to startup via /etc/init.d/o2cb start
AffectsAutomated startup of ocfs2 via /etc/init.d/o2cb start
SymptomsWith selinux enabled, starting ocfs2 via "/etc/init.d/o2cb start" fails with the following error: "mount: block device ocfs2_dlmfs is write-protected mounting read-only. mount: cannot mount block device ocfs2_dlmfs read-only. Unable to mount ocfs2_dlmfs filesystem Failed"
SolutionFor OEL5U3, Manually mount OCFS2_DLMFS using the command mount -t ocfs2_dlmfs ocfs2_dlmfs /dlm. Fixed in OEL5U4.
 
Bug No6219364
SummarySystems using kexec/kdump with Broadcom Tigon3 NICs will not be able to dump vmcore.
AffectsTroubleshooting of systems via kexec/kdump with Broadcom Tigon3 NICs.
SymptomsWhen troubleshooting with kexec/kdump, the system throws errors when trying to bring up the ethernet interface when trying to connect to the system on to which the vmcore should be dumped. This does not affect normal operations.
SolutionFixed in 2.6.18-53.0.0.0.1.el5 kernel
 
Bug No6241862
SummaryUsing sysrq+t with netconsole/tg3 configured causes the system to panic.
AffectsTroubleshooting of systems via "alt sysrq t" with netconsole/tg3 configured.
SymptomsWhen troubleshooting system, usage of "alt + sysrq + t" with netconsole/tg3 configured to take a system stack trace may cause the system to panic . This does not affect the normal operation of the system.
SolutionFixed in 2.6.18-92.0.0.0.1.el5 kernel or higher
 
Bug No5240928
Summarywarning messages in trace files during certain workloads with async io turned on
AffectsPerformance under high i/o load
SymptomsFollowing warning in trace files WARNING: ORACLE PROCESS RUNNING OUT OF OS KERNEL I/O RESOURCES
SolutionFixed in 10.2.0.4. For 10g, versions lower than 10.2.0.4 ,apply patch 5452672.
 
 
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