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Message-ID: <4DA0465D.2000409@gmail.com>
Date: Sat, 09 Apr 2011 06:43:25 -0500
From: Dale <rdalek1967@gmail.com>
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Subject: Re: [gentoo-user] LVM for data drives but not the OS
References: <4D9D9071.2050504@gmail.com> <4DA037DD.1050409@gmail.com> <4DA03973.4040103@gmail.com> <201104091319.10422.alan.mckinnon@gmail.com>
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Alan McKinnon wrote:
> Apparently, though unproven, at 12:48 on Saturday 09 April 2011, Dale did
> opine thusly:
> Yes.
>
> PVs, VGs, LVs all have a concept of extend|resize|reduce. What that means
> depends on what you are working with, but they all make the thing bigger or
> smaller.
>
> For a PV it means the underlying device's size changed, so the PV must change
> to match. Take a 500G drive, create 1 partition on it of 100G and make it a
> PV. Now enlarge the partition to 200G, you must extend the PV to match.
>
> A VG isn't a single thing, it's a collection of things. Extending it means to
> add more PVs, reducing it means to take PVs out of the VG. Hopefully you will
> always remember to migrate the data off a PV before removing it from a VG :-)
>
> Extend/Reduce an LV means to make the device larger/smaller. It is exactly the
> same thing as changing a partition size using fdisk. Obviously, you need to
> tweak the filesystem at the same time
>
>
So, when I get me a new drive, I use pvcreate to get it ready for LVM,
then use vgextend to add it to the VG, then it is available for whatever
LV I want to extend or to make a new LV?
I think I am catching on here. It was just difficult for me to grasp
how things are layered for some reason. Some of the pictures I found
helped a good bit tho. Just helped me picture what the commands are
doing exactly.
I did learn the hard way to resize the file system tho. I forgot that
earlier. Sort of had me scratching my head for a bit. lol
Dale
:-) :-)