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Record size and other stuff
Hi I'm currently working on deepening my understanding on hard disk drives and file systems, and I have come accross somethine that I find hard to get any relevant hits on Google on: Record size. Now, I know it has something to do with the size of the chunck of data the OS/file system is asking for from the disk when reading a file, and the other way around for writing. My question is best presented as a list I suppose: - What is the definition of RS? - How normal is it for a FS to vary it? - On what conditions does the FS vary RS, if it does? - Does "default RS" exist, and can I change it? - Does the term "RS" mean fairly the same between FSs? FS = File System and RS = Record size, but I suppose that any of you that may actually be able to help me out, understood that perfectly well ;-) I know that the file system benchmarking tool IOZone checks the file systems performance over two axis, namely file size and record size, creating a 3D surface graph hoovering above the file size / record size "floor", with performance along the z-axis, so I guess that sort of answers some of my questions. But the reason I want to know more about record size, is to better understand the results generated by IOZone. Slightly on another note, I'd like to ask you guys if you know about any good web sites that deals with file systems, and their inner structures and workings. (The reason I'm trying to expand my horizon on the subject is that I'm currently bench marking a computer with a circuit "inserted" on the IDE-cable between the host and device. This circuit has some fifos, and I'm trying to figure out how important the sizes of these fifos are. More specificially I'm hoping to find the breaking point in the performance/fifo size graph, if it exists in the fifo size range I'm operating in...) -Fred H, Norway. |
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