Storage Area Networks For DummiesÂ®

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396 Par t V: Understanding the Cool Stuff IP Network Classifying storage tiers and data, and moving data to the correct pool as it ages Fabric Virtualization Device Figure 15-14: Pooling storage into groups based on cost or performance. Heterogeneous Production Storage Pool Tier 1 and Tier 2 Disk-Based Backup Storage Pool Tier 3 Virtual-Tape-Based Deduped Archive Pool Tier 4 Transparent data movement is the holy grail for ILM. For ILM to work, you must be able to easily move data between the different storage arrays in the pools while the applications are running. While the data ages, policies created at the virtual abstraction layer move the data between the different storage arrays, from the most expensive and highest performing, all the way to tape so the data can be archived or removed. Figure 15-15 shows the different storage devices presenting physical LUNs or tapes through the SAN fabric to the virtual abstraction layer. The physical storage devices are then abstracted into virtual devices, so the host doesn’t know or care about the location of the physical devices. Data access is now abstracted from the physical devices. Now we can move the data from the left to the right, from more expensive to less expensive tiers of storage as the data ages, all transparent to the hosts.
Chapter 15: Everything You Ever Wanted to Know about Virtualization 397 Vdisk Tape Server/Application Layer Virtual Abstraction Layer Fabric Layer Tape Figure 15-15: Pooling storage into groups based on cost or performance. Physical Storage Layer Transparent Data Movement Over Time Virtual tape Virtual tape is not the ability to take multiple physical tape drives and make them into virtual tape drives. Virtual tapes are created from disks. Virtual tape solutions abstract physical disks and make them look like tape drives to a server. I know it sounds weird, but think about it. Disks are really fast random access devices, and tapes are slower sequential access devices. (Sequential access means you have to access individual files in the sequence in which they were stored.) If I can make a disk look like a virtual tape, instead of having to wait for the tape to wind around in circles to get to the file I want, I simply “seek” to it. Virtual tape eliminates all the tape movement that slows backup. And since the writes from the backup are to disks that look like tapes, virtual tape can eliminate physical tape. De-duplication and electronic replication are now being used with virtual tape solutions so that data can be stored even longer on less storage, and once de-duplicated, replicated off-site more efficiently by using less wide area network (WAN) bandwidth. Figure 15-16 shows how a virtual tape solution works.
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Storage Area Networks For Dummies
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Author’s Acknowledgments Christop
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Contents at a Glance Introduction .
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4 Storage Area Networks For Dummies
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In this part . . . The computer ind
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8 Par t I: SAN 101 In a nutshell, y
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10 Par t I: SAN 101 Disk drives in
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12 Par t I: SAN 101 Finding Out Whe
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14 Par t I: SAN 101 ✓ Servers tha
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16 Par t I: SAN 101 ✓ Gateway: A
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18 Par t I: SAN 101 on the other ha
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20 Par t I: SAN 101 All Fibre Chann
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22 Par t I: SAN 101 ✓ Any backup
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24 Par t I: SAN 101 Host layer Fabr
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26 Par t I: SAN 101 Newer drive-int
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28 Par t I: SAN 101 ✓ Long-wave:
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30 Par t I: SAN 101 Large-scale, co
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32 Par t I: SAN 101 Hubs typically
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34 Par t I: SAN 101 You could conne
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36 Par t I: SAN 101 Using modular s
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38 Par t I: SAN 101 Data routers A
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40 Par t I: SAN 101 Cables Cables a
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42 Par t I: SAN 101 Core (9-micron
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44 Par t I: SAN 101 Basic SAN port
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46 Par t I: SAN 101 Table 2-2 (cont
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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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56 Par t I: SAN 101 downtime is a p
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58 Par t I: SAN 101 These arrays ar
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60 Par t I: SAN 101 Most SAN storag
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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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80 Par t I: SAN 101 Distance slows
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82 Par t I: SAN 101 You need to rep
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84 Par t I: SAN 101 Little things c
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86 Par t I: SAN 101 If you’re pur
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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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100 Par t II: Designing and Buildin
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196 Par t III: Using Advanced SAN F
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Storage Area Networks For DummiesÂ®

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