Jack, > Except for minimal "boot" systems, like yours and Lucho's > multiboot diskette, I recommend a minimum of 250-MB cache > to handle todays' LARGE "Windows" files. Copying a 100- > MB file will take 200-MB of UIDE's cache space (input and > output), and some cache space must remain for directories > so the NEXT disk operation does not have to re-read them. > > Having to "discard" DOS directories, to make room for new > data files, is the main loss of speed when using UIDE, so > users should allocate as large a UIDE cache as possible.
A cache might already "know" that the directories are more useful because they are accessed more often, so even when a copy of a large file "pushes out" the directories, they are cached again soon :-) Also, you do not have to cache data on the first write, you can also wait until it is read again before you cache it - lbacache has a command line option to select whether or not to cache on write afair. Of course if data already is cached, you will have to update the cached copy on writes. So the difference is only whether or not to add data to the cache when it is written. Another question is how often people copy 100 MB files on "non-Windows" DOS systems and whether it bothers them that doing so, with a small cache, will "flush out" useful data such as FATs and directory data from the cache, temporarily reducing speed. Eric PS: Best wishes for your speedy operation recovery... PPS: "know" based on I/O patterns, not filesystem awareness. ------------------------------------------------------------------------------ Magic Quadrant for Content-Aware Data Loss Prevention Research study explores the data loss prevention market. Includes in-depth analysis on the changes within the DLP market, and the criteria used to evaluate the strengths and weaknesses of these DLP solutions. http://www.accelacomm.com/jaw/sfnl/114/51385063/ _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
