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Configuring SANs: Dos and Don ts
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Configuring SANs: Dos and Don'ts
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What problems are being resolved through implementation of the SAN environment What is the technical requirement for the business operation What is the broad case of the business environment What are the corporate and/or project goals in SAN implementation Is there a timeline Is there a cost/benefit analysis that needs to be recognized Figure 4-4 illustrates the SAN life cycle.
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Figure 4-4 SAN life cycle
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Configuring SANs: Dos and Don ts
SAN Architecture
4
When configuring a SAN, be sure to develop architecture that meets your system requirements and analysis. SAN architecture development requires good management that recognizes operating and performance considerations, successful data collection, and implementations of phase/cycle development procedures. A detailed SAN architecture includes fabric topologies of all related fabrics, storage vendors, SAN-enabled applications being used, and considerations that affect your overall SAN solution. Contingent on the definition and development of requirements and needs, your SAN architecture can be either timely or a short-lived process. It is good to recognize that this should be a precise developmental phase.
Building a Testbed
You need to develop a prototype of the SAN architecture solution that you established and then test it so that functionality will be fully adopted. Testing should be completed using nonproduction system analysis methodologies. This component of the SAN life cycle may involve readdressing the SAN architecture if any inconsistencies are found during testing. Testing your SAN architecture may or may not be a totally plausible concept. With large systems, it may not be an easily accommodated task to test all aspects of a SAN configuration; however, often there are documents that relate certifications of configuration from other vendors that expensed the testing for you. Using these certifications and remembering your specific SAN architecture perhaps will alleviate the requirement of testing before implementation. Still, in all, compliance testing is required because of the nuances that may arise in timing or interactivity or because you could experience device failures. A test plan is required prior to releasing your SAN architecture for production. Take your time to test and access your SAN environment. Noting any potential weaknesses will be worth its weight in gold if they are resolved during testing and prior to release.
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Configuring SANs: Dos and Don ts
Configuring SANs: Dos and Don'ts
Legacy-to-SAN Environment
Figure 4-5 shows a new enterprise system and/or legacy-to-SAN environment. This figure illustrates how storage pools interact in the old enterprise system. The SAN architecture is ideal to handle large amounts of data requiring high accessibility. The most common communication infrastructure for a SAN is Fibre Channel (a serial switched technology that operates in full-duplex mode with maximum data rates of 100 MBps in each direction). Originally, Fibre Channel was designed to compete with and possibly replace Fast Ethernet. Fibre Channel is now nearly synonymous with data storage. Fibre Channel supports distances of up to 10 km, and this is an improvement over SCSI s 6 m limitations. Fibre Channel runs over fiberoptic and copper cabling, although copper cabling does restrict the cable length to 30 m. Fibre Channel supports multiple protocols, including SCSI, Internet Protocol (IP), and Asynchronous Transfer Mode (ATM) Adaptation Layer 5 (AAL5). In theory, SANs enable users to access information from any platform (this is important in mixed Windows-UNIX installations that are so very common), share storage devices and files, and readily
Figure 4-5 New enterprise system (legacy-toSAN environment)
Clients
UNIX Storage allocated as needed
WIN2K
NETWARE
LINUX
Direct Workstation SAN Attachment
All data including backup flows on SAN
VIRTUAL STORAGE POOL Serverless Backup Disk to Tape
RAID
JBOD
DELL
OTHER
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