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This presentation covers the basics for storage sizing for SAP applications.
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Storage Sizing for SAP
1.
SAP Minors Program
TEEAM Region Webex Series âStorage Sizing for SAPâ Cenk Ersoy Advisory SE cenk.ersoy@emc.com © Copyright 2014 EMC Corporation. All rights reserved. 1
2.
SAP Minors Program
SAP Minors Community Page: https://community.emc.com/community/connect/ presales/presalesminorsprogram/presales-minors-sap SAP Minors Training Path and Training Modules are available here: https://community.emc.com/docs/DOC-31637 © Copyright 2014 EMC Corporation. All rights reserved. 2
3.
WHAT IS SIZING
âą Sizing is the process of translating business needs into hardware requirements âą SAP sizing determines max hardware requirements based on sizing KPIs such as CPU time, disk size/performance, memory size, network bandwidth âą Sizing is an iterative process âą Sizing method is usually based on several assumptions (number of users, documents processed per hour etc) â make sure you document/test your assumptions âą Every vendor (or even every specialist at a vendor) may have its own method of sizing © Copyright 2014 EMC Corporation. All rights reserved. 3
4.
âą Greenfield SIZING
TYPES â Customer is implementing SAP for the first time â Estimate sizing using SAP QuickSizer and SAP Sizing Guidelines (e.g. http://service.sap.com/quicksizing and http://www.sap.com/bisizing ) âą Brownfield or âpost-go-liveâ â Customer currently running SAP but looking to expand their hardware capacity , add more users or re-platform â Extrapolate sizing from existing hardware and measured utilization âą Hybrid â Brownfield customer but âŠlooking to implement new SAP components or newer release which will be Greenfield â Mix of approaches to sizing © Copyright 2014 EMC Corporation. All rights reserved. 4
5.
ANOTHER VIEW OF
SIZING TYPES TYPE Recommendation Initial (Greenfield) Use the online SAP QuickSizer Tool â usually for budget estimation ( http://service.sap.com/quicksizing ) Resizing (no new functionality but more users or data) Get values from current SAP monitors (DB02, ST06, ST03N etc), OS monitors (perfmon, kstat etc) and extrapolate Delta Sizing (new business functionality) Combination of QuickSizer and SAP monitors Upgrade Sizing (newer release) Use SAP monitors (DB02, ST06, ST03N etc) and consult the related OSS Note for the upgrade T-Shirt Sizing (new application where QuickSizer is not available) Consult SNC, IPC sizing guide or see http://service.sap.com/sizing © Copyright 2014 EMC Corporation. All rights reserved. 5
6.
CAUTION âą Do
not rely simply on the output of the sizing tool. Factors such as code customizing, parameter settings, usage behaviour, data growth rate, data lifecycle policies and in-place datacenter processes may affect the actual required sizing. ⹠Get the input of business users as well (not just infrastructure team). ⹠For customer with very extensive code modifications, expert level SAP sizing may be needed. ⹠Sometime custom questionnaires may be used. © Copyright 2014 EMC Corporation. All rights reserved. 6
7.
Usual Suspects -
Bottlenecks âą SAP â ABAP Programming / SQL âą Missing Index âą Z-procedures âą Database âą Layout â count of data container... âą Balance between the storage components âą Data striping âą Host (physical oder virtual) âą SAN / NAS âą Storage âą Main memory (RAM) âą Count of channels to the storage (HBA, NIC, Queue depth) âą Performance (Gb/s) âą Count of channels âą Distance âą Frontend channels âą Cache (Storage system) âą Resource consumption âą Drive type and tiering âą Layout âą Multiple Striping © Copyright 2014 EMC Corporation. All rights reserved. 7
8.
What is SAPS
SAP Application Benchmark Performance Standard ⹠It is a hardware-independent unit that describes the performance of a system configuration in the SAP environment. SAPs are the number of SD dialog steps using transactions VA01->VL01N->VA03->VL02N->VA05->VF01 that can be completed in one minute. ⹠Since the benchmark has a built-in think time of 10 seconds between dialog steps, each user can complete 60/(10+ RT) dialog steps per minute. 100 SAPS = 2,000 fully processed order line items / hour or = 6,000 dialog steps and 2,000 postings or = 2,400 SAP transactions (VA01->VL01N->VA03->VL02N->VA05->VF01) or ~ 20 SD benchmark users @ 2 sec response time ~ 18,35 SD benchmark users @ 1 sec response time © Copyright 2014 EMC Corporation. All rights reserved. 8
9.
What is SAPS
âą SAPS value is a hardware-independent unit of measurement that equates to SAP OLTP throughput of Sales and Distribution users. âą SAPS value is not a pure hardware performance indicator, but also a software performance indicatorâmeasuring a Unicode system yields lower SAPS numbers than a non-Unicode system. âą Starting in 2009, SAP SD Standard Application Benchmarks must have a response time below one second (instead of 2 seconds before), must be Unicode-based, must use the general ledger business functionality, must use Enhancement Package 4 for SAP ERP 6.0, and must use special versions of SAP_APPL and SAP_BASIS. Because of these changes, the same hardware can deliver a lower SAPS number in benchmark certificates of 2009 than of 2008. © Copyright 2014 EMC Corporation. All rights reserved. 9
10.
SAPS value is
closely related to CPU power Source: SAP AG © Copyright 2014 EMC Corporation. All rights reserved. 10
11.
SAP Benchmarks âą
SAP works closely with hardware vendors and performs benchmarks on different hardware configurations. ⹠The results are published at http://www.sap.com/solutions/benchmark/sd2tier.epx © Copyright 2014 EMC Corporation. All rights reserved. 11
12.
SAP Benchmark Example
Source: SAP AG © Copyright 2014 EMC Corporation. All rights reserved. 12
13.
SAP Sizing Fundamentals
âą The smallest possible server is usually determined by the peak load of the largest data base (very conservative) âą SAP recommends a max resource utilization of 65% Results of QuickSizer defines a system that will run at 65% utilization. âą Some real life ratios of database versus App server power: â 1 : 3 for OLTP (at least 25% for DB, 75% for App) â 1 : 2 for OLAP (at least 33% for DB, 66% for App) © Copyright 2014 EMC Corporation. All rights reserved. 13
14.
SIZING: Key performance
indicators âą CPU â Processing time â Cost factor â number of servers and/or CPUs â Expressed in SAPS (www.sap.com/benchmark) â Rule of Thumb: 1:1 vCPU:pCore âą Memory â Cost factor â physical memory slots in server, DIMM size â Expressed in MB/GB â Rule of Thumb: No memory over-commitment. Donât forget to consider consider OS, DB memory requirements âą Disk â Needed to store data (SAP repositories - ABAP Code) â Cost factor â amount of data, retention period, disk I/O, backup © Copyright 2014 EMC Corporation. All rights reserved. 14
15.
Source: SAP AG
© Copyright 2014 EMC Corporation. All rights reserved. 15
16.
Sizing Core Storage
SAP Sources SAP Recommendation Process Alternative Data Sources for SAPS (if you donât receive SAP Quick Sizer Project) âą Oracle AWR Reports + SAP EWA âą SAP Early Watch Reports âą Customer spreadsheet with SAPS âą Pure IOPS âą Customer RFP © Copyright 2014 EMC Corporation. All rights reserved. 16
17.
SAP QuickSizer Example
Note: SAP OSS ID is required to access Quick Sizer © Copyright 2014 EMC Corporation. All rights reserved. 17
18.
SAP QuickSizer Ćžï
The customer works with a SAP consultant to define their initial environment within QuickSizer. Ćžï QuickSizer has two independent models for sizing: User based and throughput based Ćžï QuickSizer estimates CPU, memory and disk requirements. Ćžï Throughput based sizing is better for larger projects but usually the customer lacks the input data (number of processed orders, document sizes, online usage behaviour, background jobs etc) Ćžï It is better to use «DB SAPS» values from QuickSizer for storage sizing © Copyright 2014 EMC Corporation. All rights reserved. 18
19.
SAP QuickSizer Ćžï
The CPU sizing result assumes 65% utilization. It is OS and hardware independent Ćžï Disk size recommendation is based on the sizes of the DB tables in the DB Data Dictionary in SAP. It is platform independent. Storage sizing for binaries, images, temp areas and SAPMNT are not considered in the disk space calculations. Ćžï Memory sizing is also hadware independent. Unicode is assumed. © Copyright 2014 EMC Corporation. All rights reserved. 19
20.
Source: SAP AG
© Copyright 2014 EMC Corporation. All rights reserved. 20
21.
Limits of QuickSizer
Based Sizing © Copyright 2014 EMC Corporation. All rights reserved. 21
22.
Sizing Core Storage
SAP Early Watch Alert and AWR for Oracle © Copyright 2014 EMC Corporation. All rights reserved. 22
23.
Sizing Core Storage
SAP Early Watch Alert for SQL © Copyright 2014 EMC Corporation. All rights reserved. 23
24.
Sizing Core Storage
Customer Spreadsheet, Pure IOPS, Customer RFP © Copyright 2014 EMC Corporation. All rights reserved. 24
25.
Disk: Space &
IO Sizing âą Data from QuickSizer is database space only â Need to allow for OS, swap, database software, SAP software, etc â Information is in âInstallation Guidesâ âą Estimating IOPS based on SAPS. â IOPS can be estimated from SAPS, using just the Database SAPS â For transactional systems, ECC, CRM, SRM, etc (%70r/30w or %80r/ %20w): âą Front End IOPS = 0.6 * Database SAPS â For analytical systems, BW, SEM, etc (%50r/%50w): âą Front End IOPS = 0.9 * Database SAPS **If DB SAPS are not known, General Rule of Thumb recommends use 40%-60% of Total SAPS. On the other hand major Server Vendors (and some SAP documentation) usually pitch 20%-30%. There is NO universally accepted method to convert SAPS to IOPS © Copyright 2014 EMC Corporation. All rights reserved. 25
26.
Disk: Space &
IO Sizing âą Some documentation use the following conversion from SAPS (not DBSAPS!) to IOPS â For transactional systems, ECC, CRM, SRM, etc (%70r/30w or %80r/ %20w): âą Front End IOPS = 0.4 * SAPS â For analytical systems, BW, SEM, etc (%50r/%50w): âą Front End IOPS = 0.6 * SAPS There is NO universally accepted method to convert SAPS to IOPS © Copyright 2014 EMC Corporation. All rights reserved. 26
27.
Disk: Space &
IO Sizing âą * ALWAYS DOCUMENT YOUR ASSUMPTIONS â Document where you got your input values (Project No from QuickSizer, MiTrend utilization reports, PerfMon etc) â SAPS to DBSAPS conversion method â DBSAPS to IOPS conversion method â Overall storage utilization factor (%65) â Read/write ratio for converting front end IOPS to backend IOPS â RAID penalty for converting front-end IOPS to backend IOPS â IO block size â Storage cache hit rate © Copyright 2014 EMC Corporation. All rights reserved. 27
28.
Disk Sizing Example
â page 1 In this Greenfield sizing example we will assume that we have the following SAPS values from the customer (QuickSizer output, custom values etc). Since this sizing exercise is performance based, capacity needs are not listed here. SERVER SAPS ERP - ECC 3,00 CRM 5,000 BW 4,000 1- First we should convert SAPS to DB SAPS by using DB SAPS = 0.3 x SAPS (we could also use 0.4) SERVER SAPS DB SAPS ERP - ECC 3,000 900 CRM 5,000 1,500 BW 4,000 1,200 Note: Since QuickSizer calculates with 65% utilization, some specialists take %65 of the SAPS value from QuickSizer and design an array with higher utilization rate. © Copyright 2014 EMC Corporation. All rights reserved. 28
29.
Disk Sizing Example
â page 2 2 â Now it is time to convert DB SAPS to Front End IO For transactional systems (OLTP), ECC, CRM, SRM, etc (%70r/30w or %80r/%20w): Front End IOPS = 0.6 * Database SAPS For analytical systems (OLAP), BW, SEM, etc (%50r/%50w): Front End IOPS = 0.9 * Database SAPS SERVER SAPS DB SAPS APP TYPE Front End IO ERP - ECC 3,000 900 OLTP 540 CRM 5,000 1,500 OLTP 900 BW 4,000 1,200 OLAP 1,080 © Copyright 2014 EMC Corporation. All rights reserved. 29
30.
Disk Sizing Example
â page 3 3 â Now it is time to calculate front end read and front end write IOs For transactional systems, ECC, CRM, SRM, etc %80 Front End Read / %20 Front End Write For analytical systems, BW, SEM, etc %50 Front End Read / %50 Front End Write SERVER SAPS DB SAPS APP TYPE Front End IO F/E Read F/E Write ERP - ECC 3,000 900 OLTP 540 432 108 CRM 5,000 1,500 OLTP 900 720 180 BW 4,000 1,200 OLAP 1,080 540 540 © Copyright 2014 EMC Corporation. All rights reserved. 30
31.
Disk Sizing Example
â page 4 4 â It is time to sum up front-end IO for OLTP and OLAP seperately to determine the IO workload from SAP servers to the storage SERVER SAPS DB SAPS APP TYPE Front End IO F/E Read F/E Write ERP - ECC 3,000 900 OLTP 540 432 108 CRM 5,000 1,500 OLTP 900 720 180 BW 4,000 1,200 OLAP 1,080 540 540 For OLTP workload, we have 1152 host reads / 288 host writes (small random IO) For OLAP worload, we have 540 host reads / 540 host writes (large block sequential IO) © Copyright 2014 EMC Corporation. All rights reserved. 31
32.
Disk Sizing Example
â page 5 5 â Now that the host workload profile is determined EMC has several tools to size the storage array based on worload : * Disk Sizer for VNX * Tier Advisor for Symmetrix Assume a storage array read cache hit rate of 20% - 40% (assume the larger value is you are proposing FASTCache. © Copyright 2014 EMC Corporation. All rights reserved. 32
33.
Disk Sizing Example
â page 6 If you do not have the storage array sizing tools (Poor Manâs Approach Jï ) âą Convert OLAP large block IO (128KB) to OLTP small block IO (8KB); âą take the front-end IOs write IO and multiply by RAID penalty factor for writes (4 for RAID5 and 2 for RAID1) âą add the front end read IOs âą the result will give you the backend IO value âą finally define a tiered backend architecture with the following IOPS per drive type: 3000 IO per SSD 180 IO per SAS/FC 15K 140 IO per SAS/FC 10K 60 IO per NLSAS/SATA (I personally do not recommend this tier) Make sure that the capacity requirements are also met. © Copyright 2014 EMC Corporation. All rights reserved. 33
34.
Sizing HANA Ćžï
HANA is server based in-memory with storage used as persistence level Ćžï Sizing is determined by SAP and the server vendor â CISCO â VCE Ćžï Storage is usually sized at 4X the memory Ćžï Disk sizing is well documented for both appliance and TDI models (see the whitepapers) © Copyright 2014 EMC Corporation. All rights reserved. 34
35.
LANDSCAPE DESIGN âą
Sizing & Landscaping are different tasks âą Landscaping is about how you logically will spread out your VMs in the SAP Systems and Landscape. âą Define your VM profiles, socialize with customer. Ex. â 2vCPU/32Gb â 4vCPU/64GB â 8vCPU/96GB âą This can lead you to discussions about HA, DR at the application level for enqueue(locking), message and DB. (Be Aware of NUMA impact for virtualized systems) © Copyright 2014 EMC Corporation. All rights reserved. 35
36.
THANK YOU ©
Copyright 2014 EMC Corporation. All rights reserved. 36
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