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Linux Distribution Details
OSOracle Linux 6 Update 4 x86_64
Kernelkernel-uek-2.6.39-400.109.1.el6uek.x86_64 or higher
Virtualization TypeParavirtualized
 
Filesystems Tested
File SystemMount OptionsDetails
ext3NoneFor single instance database files.
Configuration Files
Comments
/etc/modprobe.conf alias eth0 xennet -
 alias scsi_hostadapter xenblk -
/etc/security/limits.conforacle soft nproc 131072 -
 oracle hard nofile 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/sysctl.confnet.core.rmem_default = 262144 -
 net.core.wmem_default = 262144 -
 fs.aio-max-nr = 3145728 -
 fs.file-max = 6815744 -
 net.ipv4.ip_local_port_range = 9000 65500 -
 net.core.rmem_max = 4194304 -
 net.core.wmem_max = 262144 -
 kernel.shmmax = 16892102656 -
 kernel.shmall = 8187841 -
 kernel.shmmni = 4096 -
 kernel.sem = 250 32000 100 142 -
 kernel.msgmni = 2878 -
 kernel.msgmax = 8192 -
 kernel.msgmnb = 65536 -
 net.ipv4.tcp_syncookies = 1 -
 kernel.core_uses_pid = 1 -
 net.ipv4.conf.default.rp_filter = 2 -
 kernel.sysrq = 1 -
Miscellaneous
-
Oracle Software
OracleOracle Database 12c Release 1, Single Instance for Linux x86-64
Version12.1.0.1.0
Patchnone
 
Configuration Feedback
Bug No16823432
SummaryIO Performance degradation due to transparent hugepage enabled, when the system is under memory pressure.
Affects2.6.39-100 and upwards
SymptomsWith THP enabled by default, RAC nodes may reboot due to slow I/O, when the system is under moderate memory pressure
SolutionDisable hugepages by the command echo never > /sys/kernel/mm/transparent_hugepage/enabled and echo never > /sys/kernel/mm/transparent_hugepage/defrag
 
 
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