[TUHS] unix v5 limitations

Firstly, I should mention I'm using simh to simulate Unix version 5. Well I tried to reorganize the files in unix v5. Mainly I wanted more room on rk0 so I figured I'd create a new drive and put all the source from /usr/source/s1 on it. The first problem I had was I couldn't just cp over all the /usr/source/s1 files to the new drive because of "Arg list too long" so I figured I would just create an archive file called all.a which would include all the files in /usr/source/s1 and copy that over. But then I got "phase error" when I tried to keep adding files to the archive (I had to do this in stages, e.g. ar r all.a /usr/source/s1/a* then ar u all.a /usr/source/s1/b* etc). Phase error seemed to occur when the archive got larger than around 160,000 bytes. So I ended up creating 3 archive files to keep from getting "phase error". I was wondering does anyone understand what the limits are for the cp and ar commands? Mark