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diff --git a/doc/assignment1.md b/doc/assignment1.md index 9b4faf3..353e9f2 100644 --- a/doc/assignment1.md +++ b/doc/assignment1.md @@ -116,7 +116,21 @@ Instructions: Please answer the following questions in complete sentences. Your other operations, the device driver returns status information. 1. Why do clustered systems provide what is considered high-availability service? -1. Describe an operating system’s two modes of operation. + + Clustered systems gather together multiple CPUs to accomplish computational + work. Clustered systems differ from multiprocessor systems in that they are + composed of two or more individual systems joined together. + + Clusted computers share storage and are closely linked via a local area network. + + A high availability service will continue even if one or more systems in the cluster + fail. HA is generally obtained by adding a level of redundancy in the system. + A layer of cluster software runs on the cluster nodes. Each node can monitor one or + more of the others. If the monitored machine fails, the monitoring machine can take + ownership of its storage and restart applications that were running on the failed machine. + The users and clients of the applications see only a brief interruption of service. + +1. Describe an operating system's two modes of operation. 1. Define cache, and explain cache coherency. 1. Describe why direct memory access (DMA) is considered an efficient mechanism for performing I/O. 1. Describe why multicore processing is more efficient than placing each processor on its own chip. |