Nancy P. Kronenberg

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A VAXcluster is a highly available and extensible configuration of VAX computers that operate as a single system. To achieve performance in a multicomputer environment, a new communications architecture, communications hardware, and distributed software were jointly designed. The software is a distributed version of the VAX/VMS operating system that uses a(More)
(RISC) and is very different from VAX [5]. It is well known that CISC architectures have performance disadvantages compared with RISC architectures [2]. The main purpose of moving the OpenVMS system to the Alpha AXP architecture was to deliver the performance advantages of RISC to OpenVMS applications. We had two important requirements besides delivering(More)
Adtlitional features were needed in the VMS softw;~rc t o accommodate accessing disks on multiple systems. The distributed lock manager, described by Sandy Snaman and Dave Thiel, provides the synchronization needed to accon~plish transparent data transfers between cluster members. Other changes were also needed to broaden the file functions performecl by(More)
Extended Abstract This paper describes VAXclusters, a highly available and extensible configuration of VAX computers that operate as a single system. A VAXcluster is a "closely-coupled" structure in that it shares characteristics of both loosely-and tightly-coupled systems. For example, it has separate processors and memories connected by a message-oriented(More)
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