IBM Systems magazine, Power Systems - May 2020 - 47

FIGURE 1: SAP HANA STARTUP TIME-IMPACT OF vPEM USE
„ With vPMEM
„ Without vPMEM
0:05:12
9.7 TB

Database size

1:31:02

0:01:43
17x improvement
in startup time with
vPMEM

3.0 TB

0:32:13

0:00:00

0:14:24

0:28:48

0:43:12

0:57:36

1:12:00

1:26:24

Time (h:mm:ss)

capabilities. This represents 95%
of hot table data in an SAP HANA
instance. Time-consuming data
loading is therefore avoided and
allows simple maintenance to be
performed rather quickly. However, if the OS is rebooted as part of
maintenance, the memory contents
are lost and data must again be
reloaded at the next HANA startup.
SAP HANA also supports the
use of power-resilient hardware
persistent memory. In this case,
the data is retained across HANA
restarts, OS restarts and even system power cycles. However, as this
is hardware-based, additional costs
are associated and careful planning
and sizing are required. Current
hardware persistent memory technologies are generally also associated with higher memory latency,
which may impact normal operating
performance.
IBM introduced Virtual
Persistent Memory with IBM
POWER9* System Firmware 940 to
provide DRAM-based persistence to
LPARs in a PowerVM* environment.
This feature allows clients to use a
portion of DRAM already existing
in a system to create DRAM backed
persistent memory volumes. These
can then be assigned to LPARs and
appear to the OS just like hardware
persistent memory.

vPMEM volumes maintain
data persistence across HANA, OS
and LPAR restarts. They will lose
contents when the physical system is power cycled. However, in a
PowerVM virtualized environment
with hot-pluggable devices, concurrent firmware updates and other
RAS features, powering off an entire managed system is very rare.
vPMEM is a no-cost feature
available on every POWER9 server
and doesn't require new hardware
investment because existing system DRAM is utilized. For existing
SAP HANA instances, clients would
simply reduce the amount of DRAM
memory assigned to an LPAR and
instead create and add vPMEM
volumes to the LPAR. Hot table data
would be shifted from volatile DRAM
to LPAR persistent vPMEM volumes.
The impact on SAP HANA startup
time and availability when data is
maintained in vPMEM volumes is
significant (see Figure 1, above).

Because this feature is based
on system DRAM, accessing data
in LPAR vPMEM volumes has the
same performance characteristics
as accessing data in LPAR DRAM.
For SAP HANA support, database
performance impact of less than 3%
was required and demonstrated.
vPMEM persistence also offers flexibility over hardware
implementations. Over time as a
database grows, vPMEM volumes
can be easily reapportioned from
DRAM. Hardware-based persistent
memory are fixed in size.
The ability to quickly and easily
create and manage vPMEM volumes
through the Power Systems* HMC
also provides significant ease of use.
vPMEM volumes are part of LPAR
configuration profiles just like other
resources like CPU allocation, DRAM
memory and adapter resources.
Jim Nugen is a senior software
developer at IBM.

LEARN MORE
SAP HANA and PowerVM Virtual Persistent Memory:
Planning and Implementation Guide ibm.co/2IJHoB4
SAP HANA on IBM Power Systems: Allowed Hardware
(SAP Note 2188482) bit.ly/2Qx0Jsm

IBMSYSTEMSMAG.COM MAY 2020 | 47


http://ibm.co/2IJHoB4 http://www.bit.ly/2Qx0Jsm http://www.IBMSYSTEMSMAG.COM

IBM Systems magazine, Power Systems - May 2020

Table of Contents for the Digital Edition of IBM Systems magazine, Power Systems - May 2020

Table of Contents
From the Editor: The right tool for the job
IBM Perspective: The importance of Agile infrastructure
Currents: Arvind Krishna elected IBM CEO, James Whitehurts elected president
Currents: Take a closer look at the latest
Currents: The learning curve
Partner POV: Low- and no-code platforms offer fast-hitting solutions to the IT backlog
Cover Story: Business From the Cloud: How Power Systems infrastructure can help organizations take advantage of the benefits of hybrid multicloud environments
Feature 1: New Levels of Computing Flexibility: Red Hat OpenShift and IBM Cloud Pak solutions help clients simplify hybrid multicloud deployments
TECH Showcase: IBM Ecosystem Partners help Power Systems clients speed the migration to SAP HANA
Champions: The next generation of Power Systems experts
Techbits: Monitoring compliance using the Compliance Automation Reporting Tool
Techbits: Ask the expert: How does SAP HANA benefit from Virtual Persistent Memory?
Snapshot: Torbjörn Appehl
2020 Power Systems Solutions Directory
IBM Systems magazine, Power Systems - May 2020 - Intro
IBM Systems magazine, Power Systems - May 2020 - Cover1
IBM Systems magazine, Power Systems - May 2020 - Cover2
IBM Systems magazine, Power Systems - May 2020 - 1
IBM Systems magazine, Power Systems - May 2020 - Table of Contents
IBM Systems magazine, Power Systems - May 2020 - From the Editor: The right tool for the job
IBM Systems magazine, Power Systems - May 2020 - IBM Perspective: The importance of Agile infrastructure
IBM Systems magazine, Power Systems - May 2020 - 5
IBM Systems magazine, Power Systems - May 2020 - Currents: Arvind Krishna elected IBM CEO, James Whitehurts elected president
IBM Systems magazine, Power Systems - May 2020 - CT1
IBM Systems magazine, Power Systems - May 2020 - CT2
IBM Systems magazine, Power Systems - May 2020 - 7
IBM Systems magazine, Power Systems - May 2020 - Currents: Take a closer look at the latest
IBM Systems magazine, Power Systems - May 2020 - Currents: The learning curve
IBM Systems magazine, Power Systems - May 2020 - Partner POV: Low- and no-code platforms offer fast-hitting solutions to the IT backlog
IBM Systems magazine, Power Systems - May 2020 - 11
IBM Systems magazine, Power Systems - May 2020 - Cover Story: Business From the Cloud: How Power Systems infrastructure can help organizations take advantage of the benefits of hybrid multicloud environments
IBM Systems magazine, Power Systems - May 2020 - 13
IBM Systems magazine, Power Systems - May 2020 - 19
IBM Systems magazine, Power Systems - May 2020 - 14
IBM Systems magazine, Power Systems - May 2020 - 15
IBM Systems magazine, Power Systems - May 2020 - 16
IBM Systems magazine, Power Systems - May 2020 - 17
IBM Systems magazine, Power Systems - May 2020 - Feature 1: New Levels of Computing Flexibility: Red Hat OpenShift and IBM Cloud Pak solutions help clients simplify hybrid multicloud deployments
IBM Systems magazine, Power Systems - May 2020 - 19
IBM Systems magazine, Power Systems - May 2020 - 20
IBM Systems magazine, Power Systems - May 2020 - 21
IBM Systems magazine, Power Systems - May 2020 - TECH Showcase: IBM Ecosystem Partners help Power Systems clients speed the migration to SAP HANA
IBM Systems magazine, Power Systems - May 2020 - CT3
IBM Systems magazine, Power Systems - May 2020 - CT4
IBM Systems magazine, Power Systems - May 2020 - 23
IBM Systems magazine, Power Systems - May 2020 - 24
IBM Systems magazine, Power Systems - May 2020 - 25
IBM Systems magazine, Power Systems - May 2020 - 26
IBM Systems magazine, Power Systems - May 2020 - 27
IBM Systems magazine, Power Systems - May 2020 - Champions: The next generation of Power Systems experts
IBM Systems magazine, Power Systems - May 2020 - 29
IBM Systems magazine, Power Systems - May 2020 - 30
IBM Systems magazine, Power Systems - May 2020 - 31
IBM Systems magazine, Power Systems - May 2020 - 32
IBM Systems magazine, Power Systems - May 2020 - 33
IBM Systems magazine, Power Systems - May 2020 - 34
IBM Systems magazine, Power Systems - May 2020 - 35
IBM Systems magazine, Power Systems - May 2020 - 36
IBM Systems magazine, Power Systems - May 2020 - 37
IBM Systems magazine, Power Systems - May 2020 - 38
IBM Systems magazine, Power Systems - May 2020 - 39
IBM Systems magazine, Power Systems - May 2020 - 40
IBM Systems magazine, Power Systems - May 2020 - 41
IBM Systems magazine, Power Systems - May 2020 - 42
IBM Systems magazine, Power Systems - May 2020 - 43
IBM Systems magazine, Power Systems - May 2020 - Techbits: Monitoring compliance using the Compliance Automation Reporting Tool
IBM Systems magazine, Power Systems - May 2020 - 45
IBM Systems magazine, Power Systems - May 2020 - Techbits: Ask the expert: How does SAP HANA benefit from Virtual Persistent Memory?
IBM Systems magazine, Power Systems - May 2020 - 47
IBM Systems magazine, Power Systems - May 2020 - Snapshot: Torbjörn Appehl
IBM Systems magazine, Power Systems - May 2020 - Cover3
IBM Systems magazine, Power Systems - May 2020 - Cover4
IBM Systems magazine, Power Systems - May 2020 - 2020 Power Systems Solutions Directory
IBM Systems magazine, Power Systems - May 2020 - CoverSD2
IBM Systems magazine, Power Systems - May 2020 - SD1
IBM Systems magazine, Power Systems - May 2020 - SD2
IBM Systems magazine, Power Systems - May 2020 - SD3
IBM Systems magazine, Power Systems - May 2020 - SD4
IBM Systems magazine, Power Systems - May 2020 - CT5
IBM Systems magazine, Power Systems - May 2020 - CT6
IBM Systems magazine, Power Systems - May 2020 - SD5
IBM Systems magazine, Power Systems - May 2020 - SD6
IBM Systems magazine, Power Systems - May 2020 - SD7
IBM Systems magazine, Power Systems - May 2020 - SD8
IBM Systems magazine, Power Systems - May 2020 - SD9
IBM Systems magazine, Power Systems - May 2020 - SD10
IBM Systems magazine, Power Systems - May 2020 - SD11
IBM Systems magazine, Power Systems - May 2020 - SD12
IBM Systems magazine, Power Systems - May 2020 - SD13
IBM Systems magazine, Power Systems - May 2020 - SD14
IBM Systems magazine, Power Systems - May 2020 - SD15
IBM Systems magazine, Power Systems - May 2020 - SD18
IBM Systems magazine, Power Systems - May 2020 - SD16
IBM Systems magazine, Power Systems - May 2020 - SD17
IBM Systems magazine, Power Systems - May 2020 - SD19
IBM Systems magazine, Power Systems - May 2020 - SD20
IBM Systems magazine, Power Systems - May 2020 - SD21
IBM Systems magazine, Power Systems - May 2020 - SD22
IBM Systems magazine, Power Systems - May 2020 - SD23
IBM Systems magazine, Power Systems - May 2020 - SD24
IBM Systems magazine, Power Systems - May 2020 - SD25
IBM Systems magazine, Power Systems - May 2020 - SD26
IBM Systems magazine, Power Systems - May 2020 - SD27
IBM Systems magazine, Power Systems - May 2020 - SD28
IBM Systems magazine, Power Systems - May 2020 - SD29
IBM Systems magazine, Power Systems - May 2020 - SD30
IBM Systems magazine, Power Systems - May 2020 - SD31
IBM Systems magazine, Power Systems - May 2020 - SD32
IBM Systems magazine, Power Systems - May 2020 - SD33
IBM Systems magazine, Power Systems - May 2020 - SD34
IBM Systems magazine, Power Systems - May 2020 - SD35
IBM Systems magazine, Power Systems - May 2020 - SD36
IBM Systems magazine, Power Systems - May 2020 - SD37
IBM Systems magazine, Power Systems - May 2020 - SD38
IBM Systems magazine, Power Systems - May 2020 - SD39
IBM Systems magazine, Power Systems - May 2020 - SD40
IBM Systems magazine, Power Systems - May 2020 - SD41
IBM Systems magazine, Power Systems - May 2020 - SD42
IBM Systems magazine, Power Systems - May 2020 - SD43
IBM Systems magazine, Power Systems - May 2020 - SD44
IBM Systems magazine, Power Systems - May 2020 - SD45
IBM Systems magazine, Power Systems - May 2020 - SD46
IBM Systems magazine, Power Systems - May 2020 - SD47
IBM Systems magazine, Power Systems - May 2020 - SD48
IBM Systems magazine, Power Systems - May 2020 - CoverSD3
IBM Systems magazine, Power Systems - May 2020 - CoverSD4
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