Re: [gentoo-user] LVM for data drives but not the OS

[Joost Roeleveld <joost@antarean.org>]

On Friday 08 April 2011 16:30:03 Dale wrote:
> J. Roeleveld wrote:
> > On Fri, April 8, 2011 11:01 pm, Dale wrote:
> >> root@fireball / #
> >> 
> >> I'm still trying to figure out how the naming part works tho.  Now to
> >> mount it and put something on it.  See if it works.
> > 
> > Naming part, there are 2 ways of finding it.
> > 1: /dev/<VolumeGroupName>/<LogicalVolumeName>
> > 2: /dev/mapper/<VolumeGroupName>-<LogicalVolumeName>
> > 
> > You included a "-" in your VG-name, this is replaced with "--" under
> > /dev/mapper/
> > 
> >> Let me know if something doesn't look right.  Otherwise, I'll keep
> >> playing around with it.
> > 
> > Looks fine so far, don't forget to put a filesystem on
> > "/dev/sdb-vg/test"
> > to be able to mount it somewhere :)
> > 
> > --
> > Joost
> 
> The naming I was talking about was sort of like a label.  I wanted to
> use test, where I might use say data in real use, but ended up with this:
> 
> root@fireball / # df
> Filesystem           1K-blocks      Used Available Use% Mounted on
> << SNIP >>
> /dev/mapper/sdb--vg-test
>                        51606140    184268  48800432   1% /mnt/temp
> root@fireball / #
> 
> I don't mind the sdb--vg part tho.  I guess that sort of points to what
> all is needed to get to that point.  Might come in handy if I needed to
> remove something tho.  Sort of tells me what is what.

True :)
I tend to start my VGs with "vg_<something>". That way I know what they're 
for.
Also, it's a good idea to not name them "vg" as then you can get naming 
conflicts if you ever put the drive into another machine that also has a VG 
called that.

As example for the way I name them:
vg_<hostname>.
On my server, I actually have 2 Volume Groups. One for the OS-parts (including 
VMs) and the other for the data.

> I did try to mount it before putting a file system on it.  I sort of
> missed that part somewhere.  I knew it needed it, just forgot to do it.
> Mount sort of puked on my keyboard to remind me.  lol

Hehe :)
I forget as well sometimes.

> Whew !!  Progress.  Oh, someone posted a link to a site that had
> pictures.  That helped a good bit.  It needed more detail tho.  I'm
> going to do some google image searches and see what I can find.

I think I posted more then 1 link, actually :)

> Thanks much.

You're welcome

--
Joost