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Linux Distribution Details
OSOEL 5 Update 5 x86_64
Kernelkernel-xen-2.6.18-194.0.0.0.4.el5.x86_64.rpm or higher
Virtualization TypeParavirtualized
 
Filesystems Tested
File SystemMount OptionsDetails
ext3NoneFor single instance database files.
Configuration Files
File Name
Conf File Settings
Comments
/etc/modprobe.conf alias eth0 xennet -
 alias scsi_hostadapter xenblk -
/etc/security/limits.conforacle hard nofile 131072 -
 oracle soft nproc 131072 -
 oracle soft nofile 131072# depending on size of db, these may need to be larger
 oracle soft core unlimited -
 oracle hard core unlimited -
 oracle hard nproc 131072 -
/etc/selinux/configSELINUX=disabledRefer Bug Nos.: 6079461, 6081490
/etc/sysctl.confnet.core.rmem_default=262144# rmem_default can be tuned based on workload to balance performance vs lowmem usage
 net.core.rmem_max=4194304# rmem_max can be tuned based on workload to balance performance vs lowmem usage
 net.core.wmem_default=262144 -
 net.core.wmem_max=262144 -
 fs.aio-max-nr=3145728 -
 kernel.sysrq=1 -
 kernel.shmmax=439804651110# For 32bit architecture set (4GB-1) and for 64 bit architecture set 4TB
 kernel.shmall=1073741824 -
 kernel.shmmni=4096 -
 kernel.sem=250 32000 100 142 -
 kernel.msgmnb=65536 -
 kernel.msgmax=8192 -
 kernel.msgmni=2878 -
 fs.file-max=327679 -
 net.ipv4.ip_local_port_range=1024 65000 -
Miscellaneous
-
Oracle Software
OracleOracle Database 10g Release 2, Single Instance for Linux x86_64
Version10.2.0.4
PatchNone
 
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 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 No7689332
SummaryORACLE REPORTS I/O ERRORS FOR DB FILES RESIDING ON NFS DURING TEMPORARY NETWORK FAILURE
AffectsORACLE INSTANCE WITH DB FILES ON NFS
SymptomsIf the nfs server becomes unavailable (due to a network partition or server crash) and after major timeout (timeo*(retrans+1), specified in nfs mount options ), Oracle may report ORA-27072 in database alert logs which may results in an instance crash
SolutionFixed in 2.6.18-128.0.0.0.2.EL5 kernel or higher
 
Bug No8253185
SummaryMachine becomes unresponsive during swap pressure, due to direct reclaim threads
AffectsSystems with heavy memory and I/O load
SymptomsDuring periods of heavy memory or I/O load that forces the system to swap, the machine becomes unresponsive. In the case of Oracle RAC deployments, this could result in RAC evictions.
SolutionFixed in 2.6.18-92.1.17.0.1.el5 kernel or higher
 
Bug No8277913
SummaryNetconsole module insertion fails with bonding on el5.3
Affectsnetconsole with bonding.
SymptomsWith bonding enabled, "/etc/init.d/netconsole start" fails with the following error Initializing netconsole FATAL: Error inserting netconsole (/lib/modules//kernel/drivers/net/netconsole.ko): Invalid argument [FAILED]
SolutionFixed in 2.6.18-92.1.17.0.2.el5 kernel or higher
 
Bug No8451369
SummaryIf oracle-validated rpm is installed from CD, it fails to update the numa settings in /boot/grub/menu.lst
Affectsx86_64 AMD processor based systems
SymptomsRecommended settings for numa will not be set on AMD processor based systems
SolutionAfter install, bring up the system. Append numa=off to the lines "kernel " in /boot/grub/menu.lst. Reboot the system for changes to take effect.Fixed in OEL5U4.
 
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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