Product specifications

# chkconfig kdump off
If it should be enabled for support purposes, keep it enabled. Any settings can be made in /etc/
sysconfig/kdump. Restart it to apply the new settings.
● Install and configure the package tuned-profiles-sap-hana from the RHEL for SAP HANA channel:
# yum -y install tuned-profiles-sap-hana
● Configure the profile as follows
○ For SAP HANA operating on bare-metal:
# tuned-adm profile sap-hana
○ For SAP HANA operating in a virtual machine on a VMware hypervisor:
# tuned-adm profile sap-hana-vmware
● The following parameters have to be set in /etc/sysctl.conf. The SAP HANA installer adds some of
them, so they should be set after SAP HANA is installed.
The following is an example:
net.ipv4.tcp_slow_start_after_idle=0
net.ipv4.conf.all.rp_filter=0
net.ipv4.ip_local_port_range=40000 61000
net.ipv4.neigh.default.gc_thresh1=256
net.ipv4.neigh.default.gc_thresh2=1024
net.ipv4.neigh.default.gc_thresh3=4096
net.ipv6.neigh.default.gc_thresh1=256
net.ipv6.neigh.default.gc_thresh2=1024
net.ipv6.neigh.default.gc_thresh3=4096
kernel.shmmax=137438953472
kernel.shmall=33554432
kernel.shmmni=65536
kernel.msgmni=32768
kernel.sysrq=1
vm.swappiness=60
vm.max_map_count=2000000
vm.memory_failure_early_kill=1
fs.file-max=20000000
fs.aio-max-nr=458752
● For compatibility reasons, four symbolic links are required:
# ln -s /usr/lib64/libssl.so.0.9.8e /usr/lib64/libssl.so.0.9.8
# ln -s /usr/lib64/libssl.so.1.0.1e /usr/lib64/libssl.so.1.0.1
# ln -s /usr/lib64/libcrypto.so.0.9.8e /usr/lib64/libcrypto.so.0.9.8
# ln -s /usr/lib64/libcrypto.so.1.0.1e /usr/lib64/libcrypto.so.1.0.1
● Because SAP HANA can crash occasionally when Transparent Huge Pages are enabled, they should be
deactivated until verification. In the /boot/grub/grub.conf file, add the kernel command line
argument:
transparent_hugepage=never
● Transparent Huge Pages can be switched on and off online with:
# echo always > /sys/kernel/mm/transparent_hugepage/enabled
# echo never > /sys/kernel/mm/transparent_hugepage/enabled
● Use a tuned profile to minimize latencies:
# yum -y install tuned
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P U B L I C
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Red Hat Enterprise Linux (RHEL) 6.5 Configuration Guide for SAP HANA
Install SAP HANA Manually on RHEL for SAP HANA