Latest Entries

Playing Well With Others: Linux on z/VM

In the past, when looking at Linux on the mainframe, we considered Linux on S/390 or zSeries as simply another architecture. The S/390 platform is a 32- bit big-endian processor, and therefore, Linux on zSeries is conceptually no different from Linux on Alpha, SPARC, or PowerPC. The only areas in which there are significant differences are within the kernel and device drivers, and very few users (or even system administrators) need to be concerned with architectural features…

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The realities of managing an IT center today are far more difficult than ever before.  From 1998 to 2000, the driving force behind the dot.coms, Year/2000, and enterprise system growth fueled the economy and budgets to soaring record highs. In fact, according to the management consulting firm, McKinsey & Co., the total IT expenditures during that time rose from $374 billion to $455 billion, a handsome 10 percent Compounded Annual Growth Rate (CAGR). The money was rolling and people were buying. In fact, they were buying large amounts of hardware to mask the more complex issues of managing the storage they already had, a far more onerous task…

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zSeries Speaks SCSI

The alluring promise of Linux on the mainframe is the ability to consolidate the tens, hundreds, or even thousands of discrete servers that have populated many machine rooms onto a single managed platform. While it is one thing to move the server function, the network, and the system management, a key piece is missing from this puzzle. What about all of the data on which these servers operated?…

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This article discusses the capacity of Logical Partitions (LPARs). Through various parameters, there are three different “capacities” that you can define for each LPAR on a zSeries Central Processing Complex (CPC): the number of logical processors, the processing weight, and the defined capacity. Setting these parameters is based on a combination of factors that are technical, political, and financial. Naturally, these factors are sometimes in conflict with one another. This article, which is based on personal research, describes the relationship between these parameters…

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