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implemented with the CA image server shown in Figure 1616 The dual hardware controllers connected to modules A and B, respectively, provide the two paths to the TMR server while Veritas software dynamically monitors the two paths and switches automatically from one to another in case one path is disconnected DLT library for long-term archive For long-term archive in the CA image server, a StorageTeK L40 DLT library with 32 TB (Storage Technology Corp, Louisville, CO) is used The library has two drives, each connected to one of the TMR controller modules and providing the redundant paths to the CA image server, and hence the library provides FT connectivity to the server Meanwhile Veritas Storage Migrator and Netbackup software are installed to automatically migrate and back up the data from short-term RAID to long-term tape library archive.

(3.64)

The Veritas Migrator software has a built-in feature to monitor the multiple paths and to fail-over from one to another in case of a failure of any single CPU module or tape driver But the DLT library itself is not designed as fault tolerant Its controller and robot arm are still the SPOF The tape library is used for secondary archive, and the FT can be tolerated The main purpose is preservation of the data rather than real-time recovery of library system failure 1683 Applications of the CA Image Server 16831 PACS and Teleradiology The CA image server described in this section can be used to replace SPOFs in the image components of the PACS operation Figure 164 and 16.

(2.62)

5 show the generic PACS and teleradiology architecture, where each SPOF marked by FT and/or RED can be replaced by the CA image server design The CA image server simulator described in Section 1682 is actually a generic PACS designed for PACS training described in 28 16832 Off-site Backup Archive Application Service Provider Model (ASP) Off-Site Backup Archive ASP Model for Disaster Recovery The CA image server can be used as a fault-tolerant solution for disaster recovery of short-term image data by way of an application service provider (ASP) model The ASP shortterm image archive provides instantaneous, off-site automatic backup of acquired image data and instantaneous recovery of stored image data with CA quality and low operational cost Such an application had been implemented to support an offsite backup archive for the clinical PACS at St.

Try It Out Declarative Monitoring with JETM 1. Add JETM and its dependencies to the pom.xml for the PixWeb application. This will cause

John s Healthcare System, LA, CA from 2002 to 2207 (see 19) The CA image server with both RAID and DLT Library, as shown in Figure 1615A and C located at the Image Processing and Informatics Laboratory (IPI) at USC, served as a short-term off-site backup archive for St John s In parallel with the exams being acquired from modalities and archived in the main PACS server from St John s, 100% of the clinical image data were sent to this ASP CA image server The connection between the main archive and the ASP storage server was established via a T1 (15 Mbits/s) connection During the implementation stage a disaster scenario was initiated and the disaster recovery process using the ASP archive server was successful in repopulating the clinical system on site within a short period of time (a function of the data size and data transfer rate).

Advanced Computational Infrastructures For Parallel and Distributed Adaptive Applications. Edited by Manish Parashar and Xiaolin Li Copyright 2010 John Wiley & Sons, Inc.

The ASP archive was able to recover two months of image.

The requirements document is the rst blueprint detailing the project s scope It sets the tone for future development and guides developers as the project progresses, so it s a very important document Unfortunately, it s also fairly long This chapter identi ed about a half dozen main tables (later chapters will de ne more) and around 50 use cases, so a reasonable requirements document would probably take 50 to 75 pages To save space, a full requirements document for The Pampered Pet database isn t included here Fifty or so pages is about the minimum I ve seen on a formal project I ve worked on some projects with requirements documents with around 500 pages stored in multiple ring binders Before wrapping up, however, this section shows two key pieces of the requirements document: the mission statement and the executive overview.

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The mission statement is a very brief declaration of the project s overall purpose Sometimes it is the only part of the requirements document that upper management reads, so it needs to be written for big picture executives (Insert your own joke about big picture executives here) Ideally it should include at least a little content so the executives can discuss the project in the clubhouse after a hard round of golf The mission statement for The Pampered Pet database might read: The Pampered Pet Database will allow management to better track and understand its customers, orders, and inventory It will provide streamlined administration of currently manual processes such as work shift assignment to allow key personal to dedicate additional time to more productive uses.