Storage Area Networks For DummiesÂ®

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390 Par t V: Understanding the Cool Stuff The goal of storage virtualization is to enable you to combine multiple individual heterogeneous storage arrays from different vendors into a single virtual storage pool. One of the main benefits of storage virtualization is the ability to use a single console to provision (create LUNs and present them to the servers) storage from multiple vendors using a single console. Instead of having to learn how to provision storage using the interface that comes with an EMC storage array or an HDS array, you can use the same interface for any storage abstracted behind the virtualization solution. I’m sure you’re wondering how storage virtualization works. <strong>Storage</strong> virtualization uses firmware in hardware or software on a host, switch, or appliance to abstract the underlying physical devices connected to it. If you look at Figure 15-8, you can see three different storage vendors providing LUNs to a database server through a standard SAN fabric connection. The paths to the LUNs are being virtualized by the path failover driver so the LUNs will fail over between the HBA ports if a port or switch fails. The LUNs are then further virtualized into a volume using the volume manager software running on the server. The LUNs themselves come directly from each vendor’s storage array; since they are not virtualized, you would need to use the standard management tools provided by each vendor to create and assign them to the server or buy a third-party SAN management solution that works across different vendors’ arrays. A better way to provide storage to this server would be to use fabric-level storage virtualization appliances attached to the switches. The appliances would be able to create a virtual pool of storage from the LUNs from each vendor’s storage array, as shown in Figure 15-9. Figure 15-8: Host-based storage virtualization using volume manager and path failover. Database App File System File System Verltas Volume Manager Path Failover Driver HBA HBA Vendor A Vendor B Vendor C
Chapter 15: Everything You Ever Wanted to Know about Virtualization 391 Figure 15-9: Host-based storage virtualization using volume manager and path failover. Database App File System File System Verltas Volume Manager Path Failover Driver HBA HBA Virtual LUNS Database Volume Multiple Raid5 LOG Volume Multiple Raid1+0 Virtualization Appliance Virtualization Appliance LUN Pool Vendor A Vendor B Vendor C Creating virtual disks Figure 15-9 shows some fabric-based virtualization appliances to pool together the physical LUNs presented by the individual storage arrays, and then uses the appliances to create a virtual LUN for the server. If you look closely at Figure 15-9, you can see that there are separate virtual LUNs for the database and logs volumes for the database server, and that each of the virtual LUNs are built from multiple Raid 5 and Raid 1+0 stripe sets from the pool. The ability of virtualization to provide better performance for SANattached devices is covered in a bit more detail later. Because fabric-based virtualization is transparent to the server, we do not need to remove the host-based volume management or path failover software. The physical disks are simply turned into virtual disks and presented to the server. The server has no idea that these LUNs are virtualized. Virtual disk A virtual disk is the virtual representation of a physical disk or pool of physical disks. A virtual disk represents block-based storage from the underlying abstracted physical devices. You can create a virtual disk by ✓ Directly mapping a physical disk through the virtual abstraction layer and presenting it as a virtual disk ✓ Combining multiple physical disks into an extent pool, and then mapping out a virtual disk from the underlying pool of storage Direct mapping an existing LUN as a virtual LUN The first method of creating a virtual disk — directly mapping (also called service enabling) the physical disk back to a host as a virtual disk — may not really seem like virtualization at all, but it is, and direct mapping provides some interesting advantages (see Figure 15-10). If the virtualization solution includes added functionality not present in the original storage array (such
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Storage Area Networks For Dummies
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Contents at a Glance Introduction .
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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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Storage Area Networks For DummiesÂ®

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