Re: [linux-lvm] Total free space using added VGs and LVs

[Lou Arnold <larnolda1@gmail.com>]

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Hahaha. Brem, you and I think alike. If you can do it let me know. I don't
think people can think of a way to keep the system on-line and yet dismount
root so that LVM commands can work on it. If you can make it work, I'll buy
you a virtual beer.
Regards,
Lou.

On Sat, Oct 24, 2009 at 10:04 AM, brem belguebli
<brem.belguebli@gmail.com>wrote:

> It's non sense arguing that LVM is not intended for root due to the
> fact that you cannot shrink it  (growing online is operational and
> works fine).
>
> This is the only thing that is not allowed, though technically could
> it be possible.
>
>
>
> 2009/10/24, Lou Arnold <larnolda1@gmail.com>:
>  > Haha, Yes, it would have been nice for someone to have told me about
> LVM and
> > root. It would have saved literally days of time. But my work is
> > experimental and never with production system. In any case, now I know
> > better.
> >
> > As for the LiveCD suggestion, I did not intend to discount it. I had in
> fact
> > tried it several times, but with  some success. It probably just a matter
> of
> > finger problems for the failures. But I truly expected a graceful
> > dismantling process without the need of shutting down the system.
> >
> > This was in fact a good experience. When you have to dig into things to
> > understand why something works or doesn't work, you are always luckier
> than
> > if things go perfectly right from the beginning.
> >
> > Thanks to everyone for your help.
> > Lou.
> >
> >
> >
> > On Fri, Oct 23, 2009 at 5:06 PM, Brian McCullough <bdmc@bdmcc-us.com>
> wrote:
> >
> >> On Fri, Oct 23, 2009 at 01:41:23PM -0700, Lou Arnold wrote:
> >> > Ryan, Thanks for your suggestion. I know it works, but I had hoped to
> >> have a
> >> > solution that didn't stop the whole system while I fixed it.
> >> >
> >> > To Drew:
> >> > I think you were quite right when you spoke about planning the file
> >> system.
> >> > I've come to realize that my question is somewhat naive. One simply
> >> doesn't
> >> > do what I wanted to exactly because there is no easy way to dismantle
> >> > it.
> >> It
> >> > would be better to partition off some part of the OS drive and add
> that
> >> to a
> >> > new volume group (or a new logical volume group) and mount that under
> >> > "/mnt", and then add whatever partitions on new drives to that logical
> >> > volume. That logical volume could be dismounted and worked on, whereas
> >> > whatever is under root cannot be worked on easily.
> >>
> >>
> >> Lou,
> >>
> >> I'm surprised that you haven't yet been told that one of the first rules
> >> of
> >> LVM is "don't use it for root!"  Actually, I don't really hold with
> that,
> >> but it is MUCH more important to plan what you are doing when you do
> have
> >> an
> >> LVM root partition.  As you have found, you can not manipulate an LVM
> >> partition while it is mounted. ( I know, there are ways for certain
> types
> >> of
> >> filesystems, but in general, the rule holds. )  That is especially true
> >> when
> >> the partition that you want to manipulate is root ( / ).
> >>
> >> My general practice is to set up the following list of Logical Volumes (
> >> the minimum which serves for most general purpose machines ): root,
> swap,
> >> home, usr, var.  I generally allocate somewhere around 1G for the root
> >> partition.  The others are sized appropriately for the environment.
>  That
> >> usually leaves me a lot of free space on modern drives for "data" space.
> >>
> >> The recommendation that you should find a LiveCD at this point is
> probably
> >> one that you should respect.  Playing with mounted filesystems,
> >> particularly
> >> root, can rapidly lead you down a very nasty path.
> >>
> >>
> >> Brian
> >>
> >> _______________________________________________
> >> linux-lvm mailing list
> >> linux-lvm@redhat.com
> >> https://www.redhat.com/mailman/listinfo/linux-lvm
> >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >>
> >
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>

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