The iSeries Blog

Aug 20 2009   1:23PM GMT

What, exactly, is Single Level Store?

Mark Fontecchio Mark Fontecchio Profile: Mark Fontecchio

A new blog by IBM i Chief Architect Steve Will and IBM i Product Manager Craig Johnson has debuted on the IBM Systems Magazine website. And Will starts off with a relatively simple explanation of Single Level Store (SLS), an important part of the IBM i architecture.

Will describes it as being an attribute of the system that assigns a specific address to every piece of data — a bookmark if you will — much as if it were in memory. The benefits?

Well, one of the most important things it means is that it saves you time and money. Why? Because, in the IBM i SLS environment, the operating system manages the placement of data on storage. This is second nature to an IBM i customer but is practically unbelievable to a user who’s only familiar with other types of operating systems. Managing which disk drives are connected to the system, how full they are and what data is stored on which disks is a complex task that must be done by technical professionals. This, of course, means that technical professionals must be hired to do the job. The vast majority of customers don’t need to worry about that sort of thing for their IBM i storage.

Will added that it made adoption of solid-state drives (SSDs), which became available for Power6-based IBM i machines this April, much easier. The integrated storage management of IBM i meant the operating system “automatically recognizes an SSD, knows that it has much faster access time than traditional disks and places highly used system objects on SSD, immediately improving performance on the system.”

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