Line files were the first and only file type in the earliest days of MTS--On June 8, 2014 at 1:29:29 PM -0400 Jeff Ogden <jco@umich.edu> wrote: On Jun 8, 2014, at 4:03 PM, Mike Alexander replied: No. Line files were there from the very beginning, although with more restrictions on the size of a file and the length of a line as you've already pointed out. Line files existed even before paging. Sequential and sequential with line number files added to support the Data CellOn Jun 8, 2014, at 11:39 AM, Gary Pirkola <gpirkola@umich.edu> wrote: On Jun 8, 2014, at 1:23 PM, Mike Alexander wrote: Sequential files were invented for the data cell. That was the only reason we invented a separate file type. We figured that be eliminating random access (or at lest making it harder) we could avoid picking strips so often. Sequential files read and wrote pages sequentially which hopefully would keep the same strip active for longer. I’m not sure if there was anything special about sequential files on the data cell as opposed to on disks. --On June 8, 2014 at 1:29:29 PM -0400 Jeff Ogden <jco@umich.edu> wrote: On Jun 8, 2014, at 4:03 PM, Mike Alexander wrote: Yes. They were meant mainly to be a way to save line files on the data cell. We didn't allow you to create a line file there so if you wanted to save a line file on the cheaper data cell storage and preserve line numbers you needed to use a SEQWL file. Line files with lines longer than 255 bytes and larger than 255 pagesFrom page 2 of the U-M Computing Center Newsletter, Volume 5, Number 14, 24 September 1975: |