Storage Area Networks For DummiesÂ®

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xvi Storage Area Networks For Dummies, 2nd Edition Par t V: Understanding the Cool Stuff ......................... 333 Chapter 13: Using Data De-Duplication to Lighten the Load . . . . . . .335 Understanding Data De-Duplication ..........................................................336 Benefits of data de-duplication ........................................................336 How de-duplication works ................................................................337 Data De-Duplication in the Datacenter .....................................................338 The de-duplication vendors .............................................................339 How data gets de-duplicated ............................................................339 In-band versus out-of-band data de-duplication ............................346 Using Data De-Duplication in a SAN ..........................................................347 Files: Honey, I shrunk the files .........................................................347 Blocks: Been there, stored that ........................................................347 What about hash collisions? ............................................................350 Why Data De-Duplication Is Important .....................................................352 When to Use Data De-Dupe (And When Not To) .....................................354 Applications for which data de-duplication makes sense ............354 Applications for which data de-duplication doesn’t make sense ........................................................................355 De-Duplication in Action .............................................................................356 Chapter 14: Continuous Data Protection . . . . . . . . . . . . . . . . . . . . . . . .357 Understanding What Continuous Data Protection Is ..............................357 How CDP Makes Storage Work Like a Database ......................................358 CDP data journaling ..........................................................................359 Splitting the writes ............................................................................360 CDP makes everything different ......................................................363 Sizing a CDP journal ...........................................................................365 Best Practices for Storage When Configuring CDP Solutions ................367 The Truth about Near CDP and True CDP Solutions ..............................368 Example 1: Recovering a database with traditional backup ........369 Example 2: Recovering a database from a snapshot .....................370 Example 3: Recovering a database using near CDP .......................370 Example 4: Recovering a database using true CDP .......................370 CDP versus Snapshots ...............................................................................371 Using CDP to Eliminate Backups ..............................................................372 Using CDP to Simplify Recovery and Reduce Costs ................................374 Knowing Your CDP Vendor ........................................................................376 Chapter 15: Everything You Ever Wanted to Know about Virtualization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .379 Understanding What Virtualization Is .......................................................379 Exploring the Types of Virtualization .......................................................381
Table of Contents xvii Implementing Virtualization in a Datacenter ...........................................383 Server virtualization ..........................................................................386 Storage virtualization ........................................................................389 In-Band versus Out-of-Band Virtualization ...............................................399 In-band virtualization ........................................................................399 Out-of-band virtualization .................................................................400 The Virtualization Vendors and Where They Play .................................401 Host-based storage virtualization vendors ....................................401 Fabric-based virtualization storage vendors..................................402 Storage-array-based virtualization ..................................................402 Par t VI: The Par t of Tens ........................................... 405 Chapter 16: Ten Reasons to Use a SAN . . . . . . . . . . . . . . . . . . . . . . . . .407 You Want Better Disk Utilization ...............................................................407 You Need a Good Disaster Recovery Solution for Multiple Applications ........................................................................408 You Need Better Availability for Your Applications ...............................408 You Need More Storage Room ...................................................................409 Backup Is Taking Too Long ........................................................................409 You’re Focusing on Server and Storage Consolidation ..........................409 You’ve Been Tasked to Save Your Company Money ..............................410 You Need to Manage Storage for Many Locations from a Central Site ... 410 You Need to Decrease IT Management Costs ..........................................411 You Need Better Performance for Your Applications ............................412 Chapter 17: Ten Reasons NOT to Use a SAN. . . . . . . . . . . . . . . . . . . . .413 You Need Larger File Servers .....................................................................413 You Only Have a Few Inexpensive Servers ..............................................414 You Want to Save Your Company Money This Year ...............................414 You Want to Use the Latest and Greatest Solutions Available ..............415 You Need a Disaster-Recovery Solution for a Single Application .........415 You Want a SAN but Don’t Have the Budget ............................................415 You Use Gigabit Ethernet on Your LAN ....................................................416 Everything Already Runs Fine ....................................................................416 You Need to Back Up Multiple Remote Offices over Slow Links ...........417 You Need to Replicate Your Data for Disaster Recovery but Can’t Afford Fast WAN Connections .............................418 Index ....................................................................... 419
Page 1: Making Everything Easier! 2nd Edit
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Page 7 and 8: Author’s Acknowledgments Christop
Page 9: Contents at a Glance Introduction .
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Page 26 and 27: In this part . . . The computer ind
Page 28 and 29: 8 Par t I: SAN 101 In a nutshell, y
Page 30 and 31: 10 Par t I: SAN 101 Disk drives in
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Page 34 and 35: 14 Par t I: SAN 101 ✓ Servers tha
Page 36 and 37: 16 Par t I: SAN 101 ✓ Gateway: A
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Page 42 and 43: 22 Par t I: SAN 101 ✓ Any backup
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Page 48 and 49: 28 Par t I: SAN 101 ✓ Long-wave:
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48 Par t I: SAN 101 a Fibre Channel
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50 Par t I: SAN 101 The RAID type t
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52 Par t I: SAN 101 ✓ RAID 2: RAI
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54 Par t I: SAN 101 RAID 0+1 set: D
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58 Par t I: SAN 101 These arrays ar
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64 Par t I: SAN 101 When you were a
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66 Par t I: SAN 101 Bandwidth Movin
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68 Par t I: SAN 101 The phone netwo
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70 Par t I: SAN 101 The Switched Fa
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72 Par t I: SAN 101 Again, think of
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74 Par t I: SAN 101 The switches’
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76 Par t I: SAN 101 So what can you
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78 Par t I: SAN 101 For example, if
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84 Par t I: SAN 101 Little things c
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88 Par t I: SAN 101 Dual I/O paths
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90 Par t I: SAN 101 All switch vend
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In this part . . . If this were a b
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94 Par t II: Designing and Building
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