Re: versioned filesystems in linux (was Re: kernel support for

["Richard B. Johnson" <root@chaos.analogic.com>]

On Fri, 25 Apr 2003, John Bradford wrote:

> > You just modify your user-mode tools and your 'C' runtime library
> > to make whatever atrocious versioning mechanism you want. You can
> > even make all filenames upper case, just like VAX/VMS, and you can
> > even make your shell DCL if you want. It's where the rules are
> > enforced like (mapping everything to upper-case).
> >
> > I can see it now, upon startup `init` execs:
> >
> >    SYS$SYSTEM:LOGINOUT.EXE -
> >    INPUT=SYS$SYSTEM:[etc]inittab -
> >    OUTPUT=SYS$SYSTEM:[var.log]startup.log -
> >    ERROR=SYS$SYSTEM:[dev]console -
> >    UIC=[0,0] -
> >    PRIV=(NOALL, TMPMBX, NETMBX, SETPRV)
>
> Just wondering how difficult it would be to make a 9-track tape drive
> from scratch, and connect it up to the parallel port...  Do you think
> that old hard disk motors, from 5.25" MFM disks be powerful enough for
> the 120IPS tape transport?
>
> John.

The disk-drive motors, even for the 5.25 floppies were pancake motors
designed to directly turn the floppy, or run a belt with a small
ratio. You need a motor that runs at relatively high speed to turn the
capstan. If the capstan was 1 inch in circumference (about 0.2'' in
diameter), you need 120 revs/sec = 7200 r.p.m.  You won't do this with
a floppy motor.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
Why is the government concerned about the lunatic fringe? Think about it.