Prepare your Linux for your SAP solution with sapt...

Technology Blogs by Members

Explore a vibrant mix of technical expertise, industry insights, and tech buzz in member blogs covering SAP products, technology, and events. Get in the mix!

First of all for what do you need the tool saptune?

automatically tuning your system without reading tons of SAP notes

ensures that all your SAP systems configured identically with a central solution

create your own customized profiles

Why you have to configure all this parameters?

ensure system performance for your SAP solution like HANA

run a stable system

ensure SAP support for certified solution like HANA

SLES for SAP Applications 12 SP2 now ships with the system tuning utility saptune.
In addition to saptune, the package sapconf contains the basic utility sapconf. sapconf also allows tuning for SAP systems but is less comprehensive and offers less granularity than saptune. However, unlike saptune, sapconf is available directly in SUSE Linux Enterprise Server and thus not dependent on using SLES for SAP.

sapconf and saptune both rely on the daemon tuned to set tuning configuration but they use different (though at times very similar) tuning profiles. Therefore, only one(!) of sapconf _or_ saptune can be enabled at a time.

If you have installed your SLES system with the SAP installation wizard the correct profile is already used.

So we have two tools sapconf and saptune:
sapconf: available in SLES11 and SLES12 (without SLES for SAP Applications subscription)
saptune: available since SLES12 SP2 (only with SLES for SAP Applications subscription)

For both tools check out the official SAP documentation in note 1275776.

More details about the older tool sapconf in Ulrich Schairer's blog

There is a new reworked sapconf version which can be used since the following versions:

4.1.12-40.47.1 (SLES 12 SP3)
4.1.12-33.15.1 (SLES 12 SP2)
4.1.12-18.24.1 (SLES 12 SP1)

Details from Soeren Schmidt in his blog series:

Installation and dependencies: sapconf – Part 1
Configuration: sapconf – Part 2
Updating: sapconf – Part 3
Deinstallation: sapconf – Part 4
Summary + tips & tricks: sapconf – Part 5

How to activate it?

1.List available solutions

1.1 saptune

saptune solution list

1.2 sapconf

tuned-adm list

2. Choose a solution (saptune) or profile (sapconf)

2.1 saptune

saptune solution apply SOLUTION

2.2 sapconf

tuned-adm PROFILENAME

3. start daemon

3.1 saptune

saptune daemon start

disable / enable daemon

systemctl disable tuned

systemctl enable tuned

3.2 sapconf

sapconf start

disable daemon

  systemctl disable sapconf tuned

4. check active profile

4.1 saptune

saptune daemon status

if saptune is active sapconf/tuned-adm will show the following:

tuned-adm list

4.2 sapconf

active profile can be found under
/etc/tuned/active_profile
or

tuned-adm active

tuned-adm list

5. Apply single SAP notes

saptune note list

6. Customize an existing SUSE standard profile (sapconf)

2205917 - SAP HANA DB: Recommended OS settings for SLES 12 / SLES for SAP Applications 12

SAP recommendation

cat /usr/lib/tuned/sap-hana/tuned.conf

=> 'force_latency' is already set

If you want to add sysctl kernel parameter from other vendors (e.g. VMware for virtualization or NetApp for storage), you can set them in your own profile. Just look into their best practise guides for the recommended parameters. This is only possible with sapconf!

Example:

net.ipv4.tcp_slow_start_after_idle=0

cp /usr/lib/tuned/sap-hana/tuned.conf /etc/tuned/sap-hana/tuned.conf

vi /etc/tuned/sap-hana/tuned.conf



[sysctl]

net.ipv4.tcp_slow_start_after_idle = 0



[bootloader]

cmdline = YOUR_ADDITIONAL_KERNEL_PARAMETERS



[script]

script = /usr/lib/tuned/sap-hana/script.sh

7. Create your own profile (sapconf)

cp /usr/lib/tuned/sap-hana/tuned.conf /etc/tuned/sap-cust/tuned.conf



[sysctl]

parameter = value

[script]

script = /usr/lib/tuned/sap-hana/script.sh

adjust the parameters for your needs - 'sap-cust' is the name of the new profile