vb.net qr code scanner Achieving High Availability in Software

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Achieving High Availability
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In addition, Exchange 2000 is able to implement separate databases for individual user groups and therefore achieve higher availability as opposed to having a single contiguous database for all users. Nine separate logical unit numbers thus have been created on the Vivant 20, where all data resources will be centralized. The infrastructure will be used for all customer support activities and will enable storage of call monitoring recordings and imaging documents such as contracts or screen grabs. Implementation of the system began in November 2000 in a test center located in Sandyford, Dublin, 7 months after design analysis work first started. According to Budd, the Euroconex experience will now benefit Nova s U.S. operation and enable the company to collapse one of its data centers there. The clustering technology built into Exchange 2000 will allow one clustered server to serve multiple sites without the worry of having one system down bringing the whole e-mail system to a halt, Budd says.
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The joint venture will employ approximately 800 people, mostly in new positions, within the next 4 years. The project was scheduled to go live on June 1, when Euroconex expected to start processing merchants on its own system.
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With $100 Trillion in the Balance, DTCC Plays It Close to the Vest
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If there is such a thing as a cautious pioneer, Depository Trust & Clearing Corporation (DTCC) fills the bill. DTCC is the world s largest clearinghouse and depository, handling some $100 trillion in trading activity per year. To ensure the 24/7 continuity of its core business applications, in 1995 the company implemented two-way mirroring between IBM mainframes at two of its data centers. It implemented EMC s SRDF to handle mirroring across fiberoptic Enterprise Systems Connection (ESCON) connections. And recently, the company installed IBM s 2029 Dense Wave Division Multiplexing (DWDM) switches to optimize the use of dark fiber. The company is just now completing the latest phase of its disaster-recovery strategy the consolidation of 400 distributed servers and their direct-attached storage devices onto a SAN-based storage network infrastructure that also spans the two data centers. The servers handle file and print services, Lotus Notes, and internal application development, employing a combination of operating systems that include Microsoft Windows 2000, Windows NT 4.0, and Novell NetWare 4.11 (now being phased out). We wanted to build disaster recovery into applications and hardware from the ground up, which requires an enormous amount of infrastructure on the corporate level, says Michael Obiedzinski, DTCC s vice president of IT. SANs were the only way to go.
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Ensuring Redundancy
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The infrastructure incorporates redundancy to address all the major potential points of failure. The company installed three Windows
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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.
Case Studies
6 2000 server clusters and dual SAN fabrics that extend across the two geographically dispersed data centers, which are linked via multistrand fiber-optic DWDM connections. Twelve Brocade Silkworm 2800 Fibre Channel switches manage 10 TB of disk storage on EMC Clarion FC400 arrays. If a server fails, its resources can be picked up by a surviving server in the other city, explains Ed Alsberg, DTCC s IT operations director. If a site or array fails, the surviving server is presented with a mirrored copy of the data. So we cover darn near any disaster scenario. Computer Associates ArcserveIT running on a Microsoft Windows 2000 server manages the storage subsystems and tape libraries. All backups to tape are written automatically to a Storagetek L700 tape silo at each data center. Each application has a primary server on one site and a secondary server on the other with two-way disk mirroring. The SAN-based backup topology has been in production for 14 months and works beautifully, Alsberg notes. Callisma, the storage systems integrator that helped DTCC design its dual-SAN fabric, sees a growing number of its customers 75 percent, in fact implementing similar configurations, says Jeffrey Birr, national director of storage networking for the integrator. They ve gotten more concerned about disaster recovery in the past few months, Birr declares. They want to control things in-house rather than outsource, and they now have the technology to do it.
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