Storage Area Networks For DummiesÂ®

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412 Par t VI: The Part of Tens much storage as the company had in the first place. One person can manage multiple terabytes of storage, a task that took more than ten people before. Everything now hums along nicely with a lot less fire-fighting going on. The SAN implementation ultimately saved the company millions of dollars in annual costs. And the company can be more proactive in driving new applications forward because the storage part is so reliable and flexible. After all, aside from people, a company’s data is one of its most prized assets, and storage is where all that data resides. Those in charge of protecting and providing access to that data are some of the most important and highly compensated folks around. You Need Better Performance for Your Applications Performance is the Holy Grail of every IT organization. Moving from internal disks on the server to dual-connected SAN storage can help your applications fly. Look at it like this: An internal disk drive that’s connected to one of the latest SATA adapters can run at a maximum of a few hundred megabytes per second. If you connect the same server with dual 8-gigabit SAN host bus adapters, you can get 1600MB per second! And you can easily add adapters to the server or assign more disks in the SAN to increase performance as your needs require. Most SAN drivers support up to 32 host bus adapters in a single server! That’s 32 x 8 gigabits per second, or over 25GB per second. That’s a heck of a lot faster than a few 100 megabytes per second. Most SAN storage devices come with tons of cache memory and include algorithms that ensure that your request for data usually comes from cache memory. Because memory doesn’t need to move heads and rotate around to find information like a disk drive does, the request for data is very fast. This means that not only is the data request coming over an extremely fast connection, but the request is normally being satisfied out of memory. Getting data from cache memory is thousands of times faster than going all the way down to the disks. Having all that cache in the storage array lets you connect a heck of a lot of servers to a single array without worrying about the performance impact of doing so. Performance with server consolidation is one of the main benefits of a SAN.
Chapter 17 Ten Reasons NOT to Use a SAN In This Chapter ▶ Finding out whether a SAN makes sense for you ▶ Choosing the best storage solution for your needs <strong>Storage</strong> area networks (SANs) aren’t for everyone. A storage network can pay for itself in a very small period of time, but only if you’re in a position to take advantage of everything a SAN has to offer. A SAN may only make sense for your company if you have the right staff, budget, and business requirements to support it. If your storage requirements fall into one of the following ten scenarios, a SAN might not be right for you. You Need Larger File Servers If all you need is file sharing, then Network Attached <strong>Storage</strong> (NAS) may make more sense for you. If you require all your servers to have access to the same information at the same time, as is the case with Web servers, NAS is a better solution. NAS allows you to use your corporate network to share data among servers. Access to files based on NAS takes place over a standard Internet Protocol (IP) network. You can create a NAS server from a standard Unix or Windows server by creating a shared folder on the server so others can access that folder over the network. This technique is called a file share. Clients can connect to these file shares over the corporate network, and can share access to the files located in the shared folders. Whereas SANs use the SCSI protocol to access information as blocks of disk space, NAS enables access to storage as files over an IP network. Network File System (NFS) and Common Internet File Services (CIFS) are the protocols used for NAS. The great thing about NAS is that multiple users can have access to the same files at the same time.
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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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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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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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In this part . . . Don’t let the
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274 Part IV: SAN Management and Tro
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Storage Area Networks For DummiesÂ®

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