Operating Systems

As companies continue to rely on the cloud to deliver their more business-critical systems, they must consider how much they can trust this new paradigm. For a cloud solution to be robust enough to host the most important systems, it must be built on top of a virtualization stack that can deliver the necessary service levels…

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IBM announced new servers using the newest POWER7+ chip in October 2012. The plus (+) designation is an approach IBM has used before; most recently with the POWER6+, and before that with POWER5+, to signify chip enhancements short of a full chip revision. POWER7+ provides some substantial improvements, but those expecting POWER8, which IBM has been telegraphing for months, will be disappointed. Still, there’s much in POWER7+ to help Power shops improve overall system performance…

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This fourth article in our ISPF Power Tools series examines primary commands that aren’t restricted to a specific display screen. Primary commands are commands issued from the command, option or action line that appear at the top or bottom of ISPF displays. Please try these commands for yourself and also review the three previous articles covering:…

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I recently presented at a large conference, and one of the slides I used showed the journey of a transaction through the IT infrastructure. Using it, I explain::(Windows, UNIX and Linux), many different network and storage devices, middleware all over the place and one or more mainframes. Companies found themselves using many different tools to monitor the health of transactions that touched all these various components, on many different platforms, monitoring and managing tens of thousands of transactions.Managing IT From a Business Perspective…

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While it’s important to understand the technical, siloed aspect of managing capacity and performance, this approach alone isn’t sufficient for properly managing the business of IT. Taking a holistic perspective—based on an enterprisewide view of capacity, with Key Performance Indicators (KPIs) and business drivers (e.g., orders/minute)—gives IT a much better understanding of the capacity needs of the business and the impact of their decisions on revenue…

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For several years, the IT department has been in a state of transition within large companies and organizations. While back-office systems are as vital as ever—these being what technology consultant Geoffrey Moore calls “systems of record”—IT is supplying more strategic value to businesses as they support new “systems of engagement.”…

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The architecture of modern data centers, which host the computational power, storage, networking, and applications that form the basis of any modern business, have changed profoundly in recent years. Most conventional data center networks were never designed to handle the workloads and applications in highly virtualized cloud data centers. Many years ago, Ethernet was originally conceived to connect dumb terminals through a shared network consisting of repeaters, hubs, and eventually switches. Campus networks evolved into a tree structure; as the network grew, more branches were added until the tree developed an access, aggregation, and core layer. To prevent data packets from getting stuck circulating through infinite loops, Spanning Tree Protocol (STP) was used to divide the network at the access layer and restrict data from taking certain paths. This approach worked so well the industry decided to adopt the same approach when wiring data center networks…

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