--- Blaisorblade <[EMAIL PROTECTED]> wrote:
> To work on:
>
> /etc/fstab
> /etc/inittab maybe
Yup x 2.
> Device configs:
> things like hwclock, consolefonts and X11 don't make sense in UML (however
> you
> can run Xnest instead of normal X by changing a symlink somewhere). In some
> distros (e.g. Debian) the initscripts recognize UML and skip calling those
> tools.
This is serverland. X doesn't exist.
ntpd maintains the clock.
How does hdparms interact with UML? Do UBD devices appears as a type of disk?
> Partition tables: you'd normally copy a single partition rather than a disk,
> so you don't get partition tables.
>
> The reason for this is that when you have a partition table on a file,
> mount -o loop does not parse the table, so you need a script (easily
> writable) to calculate the offset and pass it as offset=$n_sectors to mount
> or losetup. And this is not widely known.
What about multiple filesystem image files. Can I do:
ubd0=fs0.image ubd1=fs1.image ubd2=...
The server system is strictly segregated with /var, /usr, etc partitions and
disk usage constraints and potential overflow conditions are of significant
interest to me in terms of the simulation.
What about eg. databse IO tuning? Obviously time is measured in terms of the
guest kernel; is there anything useful to be gained from watching IO behaviour
in UML.
> > Eventually I'm also interested in going the other way too: tuning the UML
> > system config then putting those changes back onto the real servers. What
> > do should I keep in mind when creating the UML image that will help me
> > avoid problems going back to the real servers?
>
> Never tried that, however I could say "make a patch for your Uml-related
> changes to /etc/fstab and similar material". If /dev/hdaN / /dev/ubda is used
> elsewhere, you'll probably want to setup some symlinks in
Typically I keep /etc in subversion so most of that "just works". I guess I was
looking for hints on what files outside the obvious might get tuned as a side
effect, that I might not necessarily notice had changed.
Typically this is more of an app specific thing though and I just check ctime.
Just looking for special conditions - I figure people on this list would know
the unwritten facts.
Thanks
--
Rich
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