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Project management services that ensure efficient turnkey integration processing with an understanding of technical interdependencies of various storage components and experiences with equipment manufacturers who may deliver critical components of your solution are essential. Comprehensive project methodologies that are flexible and responsive to your particular requirements also are necessary. You should have
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SAN project management SAN project executive SAN maintenance and support
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Before turning to a SAN, a content company relied on combinations of direct-attached storage (DAS) and network-attached storage (NAS) to house databases that served as their lifeblood. This content company outfitted servers with dedicated storage devices connected via SCSI cables (Figure 4-8). On the surface, this appears to be an appropriate and scalable solution; if project management had more data to add, it simply would add a new server and a new storage device. As content databases grew by 300 percent, the company ran up against limitations of SCSI-based DAS, including single points of failure, limited numbers of devices on the SCSI bus, and cluttered physical configurations that became difficult to manage. Provisioning new storage took an average of a week and a half . . . far too long to match the company s growth spurts. As you can imagine, this business model demanded instant access to huge pools of data that had to be correlated and served in real time. Without access, this content database provider would have no business. Its problem was running up against the limitations of the storage platform it had chosen originally as its solution. Further limitations could be the length of the SCSI chain and how many devices could be maintained on the single SCSI bus. This company turned to a SAN to boost availability and performance of content databases (Figure 4-9). The SAN included a 1.8 TB 4500 array and two 16-port 2800 Fibre Channel switches that easily handled millions of daily I/O transactions. Data became available from any server and provided improved reliability and redundancy.
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Figure 4-8 Content provider DAS
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Ethernet
Disk
Server
Server
Server
Server
Management Server
SCSI disk
SCSI disk
SCSI disk SCSI disk
Tape drive
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Configuring SANs: Dos and Don ts
Configuring SANs: Dos and Don'ts
Client
Figure 4-9 Content-provider SAN solution
Ethernet
Server
Server
Server
Server
Fiber primary switch
Fiber primary switch
Storage (or disk) array
Tape drive
The SAN slashed configuration time to about 3 days. In addition, the content company found that it could separate client, backup, and shared-file-system network traffic, significantly reducing backup times. Many organizations are looking into SANs as a way to control bandwidth utilization on their networks while ensuring good quality of service for enterprise resource planning (ERP), customer relationship management (CRM), data warehousing, and other dataintensive applications. These applications often depend on multiple databases as well as other data sources, so there are no easy rules of thumb to decide when to use SANs, NAS, or DAS. There are, however, useful questions to be answered about the data needs of your applications. The location, volume, and frequency of the data being moved are primary concerns. If you understand these factors and the related impacts of storage management and staff considerations, you will be able to develop an appropriate storage solution.
Peer Model
The peer model uses a single control plane incorporating an administrative domain that includes a core optical network and related edge devices. The edge devices see the core s topology. They are scalable; a point-to-point mesh is used for data forwarding. Routing
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Configuring SANs: Dos and Don ts
4 protocol information is passed between each device adjacent to its mother photonic switch rather than to the other edge devices. Most carriers use different approaches for different applications depending on their individual network topographies and services supported; hybrid models most likely will be popular. In this scenario, edge devices act as peers to core networks, sharing common control planes with the core. Simultaneously, other edge devices control overlay fashion with their own control plane and interface with the core through a user-network interface. Peer model functionality, as depicted in Figure 4-10, encompasses the requirement of the overlay model so that one suite of control plane protocols supports both models. A carrier can adopt the peer model and go either way, as its business model dictates.
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