Re: Volume Managers in Linux

Shawn Leas (sleas@ixion.honeywell.com)
Mon, 2 Nov 1998 15:57:20 -0600 (CST)


On Mon, 2 Nov 1998, Florian Lohoff wrote:

> Even the core developers seem to prefer other methods of
> implementing e.g. resizeing -> ext2/3 etc.

I believe you misunderstand the idea of LVM. It is definitively
not a mechanism by which filesystems are resized. Rather, it
provides a way to GRACEFULLY combine multiple physical volumes
into a virtual contiguous logical volume, and gives a STANDARD
interface to applying alocation policies and even RAID.

I only put some words in CAPS because I KNOW somebody is gonna
yell in my ear telling about MD. Well, MD isn't as clean as LVM,
and I never thought it was graceful and definitely NOT standard.

> Id like to see the LVM and an resizeable filesystem etc but
> this seems not to be the way it will go.

Having support for LVM in the kernel is so minimal it isn't
even funny. It is userland to the hilt. The patch to kernel
(ftp://ftp.msede.com/pub/linux/lvm/lvm-2.1-patch) is a grand
total of 5k, and the rest is userland utilities and a SUPER
handy lvm library.

I see no bloat, only value added. Changes NOTHING for those
who don't want it.

Oh well, I guess even core developers can be sticks in the mud.
Who would have guessed...

-Shawn
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