[K12OSN] wierd happenings when updating server

[Toshio Kuratomi]

On Fri, 2005-10-21 at 12:51 -0500, Les Mikesell wrote:
> On Fri, 2005-10-21 at 11:51, Petre Scheie wrote:
> > This isn't necessarily a good solution, but when you install, you may want to do the 
> > disk partitioning yourself and not use LVM.  The RH/FC installer defaults to using LVM. 
> >   You give up the ability to merge multiple disks into one volume, but today's disks are 
> > so huge that giving that up isn't much of a loss.  The benefits are that 1) you avoid 
> > the problem you're having; if a partition goes bad, say /boot, you can boot a Knoppix 
> > disk and mount the root partition from the damaged disk and still recover your data. 
> > With LVM, that kind of rescue becomes much more difficult if not impossible.
> 
> In theory, you can boot the FC4/Centos install disk in rescue mode and
> do the same with LVM - but there is still more to go wrong.
> 
I had to do this a few days ago for a vanilla FC3 box.  I tried the
Knoppix disk at first and then discovered the lack of LVM there :-(.  
Onc you boot up with the install disk into rescue mode (boot into "linux
resuce") you're still not out of the woods until you figure out what is
wrong with your LVM install and fixing that (I ran the "lvm" command
which dropped me into an lvm comand shell and spent a lot of time
looking at the information printed out from the various subcommands
there.)

> > Ironically, for years I complained about Linux not having logical volumes; Novell had 
> > them 15+ years ago.  Then, when RH started making it part of its stock install, I 
> > decided that LVM presents to great of a risk, and now I do my partitioning manually, 
> > creating just plain-vanilla ext3 partitions.
> 
> I'm inclined to agree, although you could split the different and put
> /, /boot, and perhaps /var on normal partitions or MD devices but
> put /home on an LVM volume so you have the option to expand later.
> 
I manually partition one combined /, /boot partition and a swap
partition.  The rest of the disk goes in lvm to be distributed out
to /usr, /var, and /home.  This gives you all the tools you need to
perform resuce of lvm on the / partition but still allows resizing /usr
as new programs are added, /var as web/mail/database needs grow,
and /home because its only a matter of time before that runs out of
space :-).

-Toshio
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