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5 happens, the result is that the device is forced to drop some of the frames. Fibre Channel has a built-in flow-control solution for this problem. A device can transmit frames to another device only when the other device is ready to accept them. Before the devices send data to one another, they must log in to one another. Fibre Channel defines several communication strategies called classes of service. The class used depends on the type of data to be transmitted. The major difference among the classes is the types of flow control used. Fibre Channel arbitrated-loop configurations consist of several components, including servers, storage devices, and a Fibre Channel switch or hub. Another component that might be found in an arbitrated loop is a Fibre Channel-to-SCSI bridge, which allows SCSIbased devices to connect into the Fibre Channel-based storage network. This not only preserves the usefulness of SCSI devices but also does it in such a way that several SCSI devices can connect to a server through a single I/O port on the server. This is accomplished through the use of a Fibre Channel HBA. The HBA is actually a Fibre Channel port. The Fibre Channel-to-SCSI Bridge multiplexes several SCSI devices through one HBA. 6 presents case studies of SANs implementations.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Source: SANs Demystified
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CHAPTER
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Case Studies
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6 This chapter is a compilation of case studies intended to provide you with insight and information about the experiences of other companies that have implemented the storage area network (SAN) solution. This is not presented as an endorsement of any particular storage company. Grateful acknowledgment is extended to Storage Networking World On-Line (SNW) for allowing us to reprint from their archives. SNW is a publication that is dedicated to providing timely, useful information for planning and implementing high-end storage solutions and services.
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SAN Implementation Saves Money and Boosts Network Performance at New York Life
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A bottleneck problem and towering storage costs led to a happy, although complex, solution at New York Life, a Manhattan-based mutual insurance company with $84 billion in assets. In fact, since moving from direct-attached storage technology to a SAN setup from EMC in Hopkinton, MA, New York Life has saved a couple of million dollars on storage equipment costs while also boosting network performance and availability, according to Michael Polito, a corporate vice president responsible for enterprise storage and business resumption services at the large insurer. In addition, the company has gained the ability to better monitor its network, which enables it to plan future server deployments more accurately. However, although the move from direct-attached storage to a mesh network of 90 servers and 12 switches has spurred network performance, it also has increased information technology (IT) complexity, a situation that New York Life is moving rapidly to resolve.
In the Beginning . . .
It was the end of 1999 when New York Life concluded it had to reduce storage costs by implementing a SAN. Its direct-connect storDownloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Case Studies
Case Studies
age infrastructure had become uncontrollably expensive, and the following spring, a storage assessment substantiated this conclusion. We felt that going with SAN technology was a better way to limit costs, Polito explains. The company s previous infrastructure consisted of EMC Symmetrix devices attached directly to a mixed bag of 90 servers. The server platforms ranged from Compaq boxes running Microsoft Windows NT, to Sun Microsystems servers running Solaris, to IBM RISC devices running AIX. Most servers were dual-attached to a Symmetrix box for reliability and redundancy. And since each Symmetrix device had 32 connectivity ports, each could support a maximum of 16 servers. However, the 32-port limitation was a bottleneck. Even though the Symmetrix devices could have supported a lot more disk capacity than 16 servers typically require, there was no way to add a seventeenth server to make use of that capacity. So we wound up paying for a new Symmetrix device to support additional servers and were unable to leverage unused DASD capacity on the other device by linking it to additional servers, Polito says. In addition, IT mirrors corporate data in order to make them as highly available as possible. This replication, although valuable, greatly increased storage administrators data maintenance burdens, and it used up more capacity as well.
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