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Accent is a communication oriented operating system kernel being built at Carnegie-Mellon University to support the distributed personal computing project, Spice, and the development of a fault-tolerant distributed sensor network (DSN). Accent is. built around a single, powerful abstraction of communication between processes, with all kernel functions, such as device access and virtual memory management accessible through messages and distributable throughout a network. In this paper, specific attention is given to system supplied facilities which support transparent network access and fault-tolerant behavior.Many of these facilities are already being provided under a modified version of VAX/UNIX. The Accent system itself is currently being implemented on the Three Rivers Corp. PERQ.© 1981 A C M 0 -8 9 7 9 1 -0 6 2 -1 -1 2 / 8 1 -0 0 6 4 $00.75 -supporting the notion of multiple, independent virtual address spaces and a virtual machine specification which can accommodate diverse interpretations of process state;-supplying two kinds of protection: 1) address space protection, to insure that no process can affect another except through the use of the inter-process communication facility, and 2) access protection in the communication facility itself to prevent unauthorized communication between processes;defining inter-process communication in a way that allows transparent debugging, monitoring and fault recovery;taking advantage of these same mechanisms to allow transparent network extension independent of network hardware or protocols; allowing all services except the basic communication primitives to be viewed by processes as being provided through a communication interface; and structuring message communication to allow intermediary processes such as debuggers, protocol converters or network communication servers to better interpret the contents and purpose of messages.Accent stands out as a relatively pure example of a communication oriented operating system --i.e. an operating system which uses the abstraction of communication between processes as its basic organizing principle. The integration of virtual memory support, file access and inter-process communication in Accent makes possible performance improvements over previous communication oriented systems (e,g. [1]) as well as a more "transparent" network operating system design. System overviewPhysically, the distributed system built around Accent can be viewed as a loosely-connected collection of host machines, each with its own primary and secondary storage. The notion of a host machine is flexible in that it can include either uni-processors or tightly coupled multi-processors. In addition, no specific assumptions are made about the technology or topology of the underlying communication network which links together these host machines. The initial host machine chosen for Spice/DSN, the Three Rivers Corporation PERQ, is a uni-processor which currently possesses a 3MHz Ethernet [5] and will eventually possess a 10MHz Ethernet.Each host machine on the netwo...
Accent is a communication oriented operating system kernel being built at Carnegie-Mellon University to support the distributed personal computing project, Spice, and the development of a fault-tolerant distributed sensor network (DSN). Accent is. built around a single, powerful abstraction of communication between processes, with all kernel functions, such as device access and virtual memory management accessible through messages and distributable throughout a network. In this paper, specific attention is given to system supplied facilities which support transparent network access and fault-tolerant behavior.Many of these facilities are already being provided under a modified version of VAX/UNIX. The Accent system itself is currently being implemented on the Three Rivers Corp. PERQ.© 1981 A C M 0 -8 9 7 9 1 -0 6 2 -1 -1 2 / 8 1 -0 0 6 4 $00.75 -supporting the notion of multiple, independent virtual address spaces and a virtual machine specification which can accommodate diverse interpretations of process state;-supplying two kinds of protection: 1) address space protection, to insure that no process can affect another except through the use of the inter-process communication facility, and 2) access protection in the communication facility itself to prevent unauthorized communication between processes;defining inter-process communication in a way that allows transparent debugging, monitoring and fault recovery;taking advantage of these same mechanisms to allow transparent network extension independent of network hardware or protocols; allowing all services except the basic communication primitives to be viewed by processes as being provided through a communication interface; and structuring message communication to allow intermediary processes such as debuggers, protocol converters or network communication servers to better interpret the contents and purpose of messages.Accent stands out as a relatively pure example of a communication oriented operating system --i.e. an operating system which uses the abstraction of communication between processes as its basic organizing principle. The integration of virtual memory support, file access and inter-process communication in Accent makes possible performance improvements over previous communication oriented systems (e,g. [1]) as well as a more "transparent" network operating system design. System overviewPhysically, the distributed system built around Accent can be viewed as a loosely-connected collection of host machines, each with its own primary and secondary storage. The notion of a host machine is flexible in that it can include either uni-processors or tightly coupled multi-processors. In addition, no specific assumptions are made about the technology or topology of the underlying communication network which links together these host machines. The initial host machine chosen for Spice/DSN, the Three Rivers Corporation PERQ, is a uni-processor which currently possesses a 3MHz Ethernet [5] and will eventually possess a 10MHz Ethernet.Each host machine on the netwo...
The file system and structure of a single-user operating system is described. The system is designed to run in a laboratory setting on a small microcomputer connected to a network with both private and network disk storage.
Ensuring data integrity in storage
Data integrity is a fundamental aspect of storage security and reliability. With the advent of network storage and new technology trends that result in new failure modes for storage, interesting challenges arise in ensuring data integrity. In this paper, we discuss the causes of integrity violations in storage and present a survey of integrity assurance techniques that exist today. We describe several interesting applications of storage integrity checking, apart from security, and discuss the implementation issues associated with techniques. Based on our analysis, we discuss the choices and tradeoffs associated with each mechanism. We then identify and formalize a new class of integrity assurance techniques that involve logical redundancy. We describe how logical redundancy can be used in today's systems to perform efficient and seamless integrity assurance.
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