Re: [gentoo-user] Re: Resize /

[Dirk Heinrichs]

Am Dienstag, 21. November 2006 06:55 schrieb ext Dale:

> > OK, here's my proposal: First, decide which volume management system to
> > use (LVM or EVMS). LVM is just one more volume management tool which
> > you would have to learn (beside fdisk, mkfs.*, raid tools, ...), while
> > EVMS does it all, and more. Then, do the real work:
>
> Which one is better and good for someone new to this?  I'm fairly
> descent at Linux.  Just thought I would warn you I am not a guru, yet.
> ;-)  I'm working on it though.

That's definitely EVMS. It replaces everything from fdisk over mkfs to RAID 
with one single tool. You can choose between a graphical, GTK+ based, a 
console, ncurses based and a pure cli based (for use in scripts) user 
interface. But, since EVMS uses a slightly different terminology, first 
read the user guide carefully.

> I never could master that tar thing others use.

Just use the one below, it works :-)

> > cd /sourcedir && tar -clf - .| tar -C /destdir -xBpvf -

Maybe even tar -C /sourcedir -clf - .| tar -C /destdir -xBpvf - works.

> OK.  I did a cfdisk /dev/hdb and I found type "8E Linux LVM" and I
> assume that it is the one you mentioned.  I have not changed anything
> just yet.  I'm just exploring the idea here.  So . .  I make a boot
> partition like I normally would, hda1.  Then create another partition
> that is the LVM type, primary or logical or doesn't matter? Is that
> correct?  Is that all I have to do with cfdisk?

Don't forget the hda2, for /. You can put / on a logical volume, too. But 
then you'll need an initrd for booting. Primary or logical doesn't matter, 
but you don't need logical partitions anymore, because with LVM you'll 
never need more than 2 or 3 (2, if you put / on a LV) partitions.

> I assume the rest is
> done elsewhere.  This is the part I am trying to get my head wrapped
> around.  I can't seem to figure out how it gets split up quite yet.
> Maybe you can "dummy" it down a bit for me?  LOL

If you decide to use LVM:

emerge lvm2
Create the partitions with (c)fdisk
create a volume group with vgcreate
create logical volumes with lvcreate
This creates device nodes like /dev/<vg name>/<lvname>
Create your filesystems.
Upon booting, Gentoo's initscripts will do the right thing to activate your 
LVs.

With EVMS:
emerge evms
run evmsn or evmsgui
create the partitions (segments), using the DOS segment manager.
create a volume group (container), using the LVM2 plugin (here you see that 
to some extend, EVMS is just an umbrella for everything storage related).
create logical volumes (regions), again using the LVM2 plugin.
(optionally) turn the LVs into EVMS volumes (you can do this with every 
storage object, to get consistant naming, 
like /dev/evms/root, /dev/evms/usr, etc.).

> Can I also assume the 2006 Gentoo CD supports this?  You also realize

Yes. Both LVM and EVMS are on the Gentoo LiveCD.

> Thanks for the help.  Links are welcome.  I try to read as much as I can.

http://evms.sourceforge.net is the one I would recommend.

Bye...

	Dirk
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