On Tue, Jun 23, 2020 at 9:03 PM Chris Zach via cctalk <cctalk@classiccmp.org> wrote:
> So I'm working on this RSX11M+ system here and while working I ran > myself out of file headers. Using the HOME /MXF command I was able to > increase the number of headers, but only up to 4090. or so. Trying to go > to 4100 gave me an error saying there were not enough system blocks or > something. Currently I have 830 headers, but that's not enough in the > long term. > I've never actually used RSX-11 myself, all I know about it is what I read in the ODS-1 spec, but I'm guessing the issue here is that the volume is set up with only 1 block allocated for the index file bitmap, and growing the number of file headers beyond 4096 would require growing the index file bitmap to 2 blocks (or more, depending on how many file headers you expect to need). Since the first 16 file headers must follow directly after the index file bitmap, growing the bitmap requires moving those first 16 file headers as well, which in turn requires moving whatever may currently be in the way. None of this of course is something I'd expect the system to be able to do while the volume is mounted. What precisely you have to do to achieve the goal of having a volume with more file headers I can't say, sorry, but I thought I could at least provide some extra context for other readers on why it's not as trivial to do as one might guess. -ken
