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Configuring SANs: Dos and Don ts
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4 increase storage capacity to meet growing needs. This all takes place while reducing the impediments of clogged LANs and wide area networks (WANs). SANs are entire storage hierarchies with network area storage (NAS), disks, tapes, tape libraries, and other archiving devices. Is there a downside to SAN implementation There are always drawbacks to system upgrades. One problem is that a SAN introduces another network. Like LANs or WANs, SANs require management software, utilities, operating system supports, security, maintenance, and training. These added complexities easily could outweigh the advantages; sometimes doubling network staff workload is not feasible when there is already plenty to do and no one available for hire. SANs represent major infrastructure changes that require compelling justifications, and they require higher-bandwidth cabling and are not currently extensible over long distances. Are there solutions to these drawbacks Yes, there are. One solution calls for the use of set protocols throughout all networks to run storage networks over IP. There are several alternatives, including storage over Gigabit Ethernet, Internet SCSI (iSCSI), and Fibre Channel over IP. Figure 4-6 exhibits a Fibre Channel solution. Gigabit Ethernet looks attractive on the surface
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Figure 4-6 Fibre Channel switches in a SAN system
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Configuring SANs: Dos and Don ts
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Configuring SANs: Dos and Don'ts
because it avoids duplication of training, test equipment, and software. The iSCSI/Fibre Channel alternative shown, though, preserves current investments of storage devices, software, and management methods. Still another possibility includes the use of emerging standards to provide migration paths from all past approaches. Solutions for wide-spectrum enterprise storage and management needs include
Data backup and recovery Backup/restore efficiency Consolidation of storage resources Improved use of storage resources Enhanced business through a modernized storage infrastructure Storage management solutions Data archival Improved flexibility and connectivity of storage resources Mass storage solutions Devices that can be attached to the SAN Communication patterns including random input/output (I/O), streaming accesses such as video, and I/O-intensive database accesses Performance characteristics: reads, writes, max/min/typical throughputs Storage solutions are delivered to customers in one of three ways:
1. Building custom solutions tailored to the client s specific needs:
Backup and recovery Archival Data management Clustering and replication Disaster management and recovery Storage infrastructure enhancements
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Configuring SANs: Dos and Don ts
4 2. Provision of integrated product solutions addressing specific application requirements 3. Developing and introducing proprietary solutions, including
Complete turnkey solutions for content management and distribution of resources such as video streaming products over broadband networks Solutions for geospatial data management and storage
4. Providing storage system management and consulting services to clients, including
Consultations to assess current storage infrastructure capabilities Determinations of future requirements and technology choices Architecture of engineering solutions Installation and integration solution components overview and analysis Solutions management
Storage Performance Survey
The first step to developing quality storage solutions is to perform a discovery evaluation of your current storage performance, data availability, and future storage needs. Engineers can, with the assistance of staff, perform and execute rigorous site surveys to develop comprehensive statements regarding current and future data management requirements. Then the requirements must be mapped against the business mission or objectives. Storage performance surveys may include
Written assessment of the current information technology (IT) storage infrastructure Network and data flow diagrams Storage use and optimization analysis
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Configuring SANs: Dos and Don ts
Configuring SANs: Dos and Don'ts
Storage Architecture and Design
The key to powerful networked storage design is in the quality of the design and the response to your requirements. Well-organized knowledge bases are necessary to design enterprise-class information and storage infrastructures. Talented, experienced storage engineers will provide custom data management solutions to meet broad continuums of challenges and deliverables that should be supported by detailed, documented strategies, including diagrams and implementation plans for data management. When appropriate, cost/ benefit plans showing payback periods and returns on investment, including optional lease analyses for all proposed products and services, can be requested. Storage architecture and design planning should include
Written recommendations for the storage infrastructure Complete design specifications Installation and integration
Whether you hire certified engineers through consultancy or designate in-house engineering teams to implement and configure your SAN, you will need to have them do the following:
Install the hardware load. Configure software for all backups. Archive. Perform media management. Provide off-site vaulting, if necessary. Implement verification and testing of backups, archivals, and restores. Develop operating policies and procedures. Recommend changes where appropriate. Provide detailed information on installation and integration, implementation, storage management software installation,
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