1. © 2009 EMC Corporation. All rights reserved. EMC Proven Professional The #1 Certification Program in the information storage and management industry Intelligent Storage Systems Chapter 4 Section 1 : Storage System

2. © 2009 EMC Corporation. All rights reserved. Chapter Objectives After completing this module, you will be able to: oDescribe components of intelligent storage system oList benefits of intelligent storage system oExplain intelligent cache algorithms and protection oDescribe implementation of intelligent storage system oHigh-end storage array oMidrange storage array

3. © 2009 EMC Corporation. All rights reserved. What is an Intelligent Storage System Intelligent Storage Systems are RAID arrays that are: oHighly optimized for I/O processing oHave large amounts of cache for improving I/O performance oHave operating environments that provide: oIntelligence for managing cache oArray resource allocation oConnectivity for heterogeneous hosts oAdvanced array based local and remote replication options

4. © 2009 EMC Corporation. All rights reserved. Benefits of an Intelligent Storage System Intelligent storage system provides several benefits over a collection of disks in an array (JBOD) or even a RAID arrays: oIncreased capacity oImproved performance oEasier data management oImproved data availability and protection oEnhanced Business Continuity support oImproved security and access control

5. © 2009 EMC Corporation. All rights reserved. Components of an Intelligent Storage System Host Connectivity FC SAN Front EndBack End Cache Physical Disks Intelligent Storage System

6. © 2009 EMC Corporation. All rights reserved. Intelligent Storage System: Front End Host Connectivity Front EndBack End Cache Physical Disks Intelligent Storage System FC SAN Ports Controllers

7. © 2009 EMC Corporation. All rights reserved. Front End Command Queuing DCBA DCBA A B C D I/O RequestsI/O Processing Order Front-End Controller Cylinders Without Optimization (FIFO) DBCADCBA A B C D I/O RequestsI/O Processing Order Front-End Controller Cylinders With command queuing

8. © 2009 EMC Corporation. All rights reserved. Intelligent Storage System: Cache Host Connectivity Front EndBack End Cache Physical Disks Intelligent Storage System FC SAN

9. © 2009 EMC Corporation. All rights reserved. Write Request Write Operation with Cache Write Request Write-through Cache Write-back Acknowledgement Cache Acknowledgement

10. © 2009 EMC Corporation. All rights reserved. Read Request Cache Read Request Cache Data found in cache = ‘Hit’ No data found = ‘Miss’ Read Operation with Cache: ‘Hits’ and ‘Misses’

11. © 2009 EMC Corporation. All rights reserved. Cache Management: Algorithms oLeast Recently Used (LRU) oDiscards least recently used data oMost Recently Used (MRU) oDiscards most recently used data New Data Oldest Data

12. © 2009 EMC Corporation. All rights reserved. Cache Management: Watermarking LWM HWM 100 % Idle flushing High watermark flushingForced flushing oManage peak I/O requests “bursts” through flushing/de-staging oIdle flushing, High Watermark flushing and Forced flushing oFor maximum performance: oProvide headroom in write cache for I/O bursts

13. © 2009 EMC Corporation. All rights reserved. Cache Data Protection oProtecting cache data against failure: oCache mirroring oEach write to the cache is held in two different memory locations on two independent memory cards oCache vaulting oCache is exposed to the risk of uncommitted data loss due to power failure

14. © 2009 EMC Corporation. All rights reserved. Intelligent Storage System: Back End Host Connectivity PortsControllers Front EndBack End Cache Physical Disks Intelligent Storage System FC SAN

15. © 2009 EMC Corporation. All rights reserved. Intelligent Storage System: Physical Disks Host Connectivity Front EndBack End Cache Physical Disks Intelligent Storage System FC SAN

16. © 2009 EMC Corporation. All rights reserved. What the Host Sees – RAID Sets and LUNs Host 1 Host 2 LUN 0 LUN 1 Front EndBack End Cache Physical Disks Intelligent Storage System LUN 0 LUN 1 Connectivity FC SAN

17. © 2009 EMC Corporation. All rights reserved. LUN Masking oLUN masking is access control mechanism oProcess of masking LUNs from unauthorized access oImplemented on storage arrays oStorage group logical entity that contains one or more LUNs and one host

18. © 2009 EMC Corporation. All rights reserved. ISS Implementation: High-end Storage Systems oAlso referred as Active-active arrays oI/O’s are serviced through all the available path oFollowing are high-end array capabilities: oLarge storage capacity oHuge cache to service host I/Os oFault tolerance architecture oMultiple front-end ports and support to interface protocols oHigh scalability oAbility to handle large amounts of concurrent I/Os oDesigned for large enterprises Host Storage Array Active-Active Configuration Active LUN Controller A Controller B Port

19. © 2009 EMC Corporation. All rights reserved. Midrange Storage Systems oAlso referred as Active-passive arrays oHost can perform I/Os to LUNs only through active paths oOther paths remain passive till active path fails oMidrange array have two controllers, each with cache, RAID controllers and disks drive interfaces oDesigned for small and medium enterprises oLess scalable as compared to high-end array Host Storage Array Active-Passive Configuration Active Passive LUN Controller A Controller B Port

20. © 2009 EMC Corporation. All rights reserved. Chapter Summary Key points covered in this chapter: oIntelligent Storage Systems features oComponents of Intelligent Storage Systems oCache management algorithms oIntelligent Storage System implementation oHigh-end storage array oMid range storage array

21. © 2009 EMC Corporation. All rights reserved. Concept in Practice: EMC CLARiiON oSupport for UltraFlex technology oScalable from up to 960 disks oSupports flash drives oSupports different types and sizes of drives, and RAID types (0, 1, 1+0, 3, 5, 6) oSupports up to 16 GB of available cache memory per controller (Storage Processor) oEnhances availability with non disruptive upgrade and failover oEnsures data protection through mirrored write cache and cache vaulting oSupports storage-based local and remote data replication oThrough SnapView and MirrorView software

22. © 2009 EMC Corporation. All rights reserved. 2009 CLARiiON Family

23. © 2009 EMC Corporation. All rights reserved. CLARiiON CX4: The Proven Midrange Storage Solution

24. © 2009 EMC Corporation. All rights reserved. CLARiiON CX-4 Architecture

25. © 2009 EMC Corporation. All rights reserved. EMC Symmetrix oIncrementally scalable to 2,400 disks oSupports Flash-based solid-state drives oDynamic global cache memory (16 GB–512 GB) oAdvanced processing power (up to 130 PowerPC) oDirect matrix Architecture oHigh data processing bandwidth (up to 128 GB/s) oData protection with RAID 1, 1+0 (also known as 10 for mainframe), 5, and 6 oStorage-based local and remote replication oThrough TimeFinder and SRDF software Additional Task Research EMC Symmetrix V-Max

26. © 2009 EMC Corporation. All rights reserved. Direct Matrix Architecture

27. © 2009 EMC Corporation. All rights reserved. External Links oEMC Clariion Family oCombine midrange networked storage with innovative technology and robust software capabilities to manage and consolidate your data. ohttp://www.emc.com/products/family/celerra-family.htmhttp://www.emc.com/products/family/celerra-family.htm oEMC Symmetrix Family oFeaturing new EMC Symmetrix V-Max, which leverages the EMC Symmetrix Virtual Matrix Architecture to deliver unprecedented levels of scalability and efficiency. ohttp://www.emc.com/products/family/symmetrix-family.htmhttp://www.emc.com/products/family/symmetrix-family.htm

28. © 2009 EMC Corporation. All rights reserved. #1 IT company For more information visit http://education.EMC.com