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SubjectRe: Volume Managers in Linux
On Mon, 2 Nov 1998, Florian Lohoff wrote:

> > 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.
>
> Yep - And even this Ted thought of beeing integrated into the ext234
> filesystem

THIS is not the unix way. The unix way is to provide a primitave
for userspace to do with as it needs. NOT make EXT2 like MS Word.
Ted has done GREAT work in coding all that he has. He's the brain
behind PowerQuest's Ext2 resizer in their Partition Magic program.

However, I still have to take issue with shoving volume mgmt into
the FS layer. Remember, LVM gives ALL of userland a simple block
device to use. All the features, however you wanna use it.

I SERIOUSLY don't know what your objection is/was.

> I also heard the speak of Ted about resizeable ext2 end future
> whith holes in the fs etc, letting ext2 handle the multi-PHYSICAL-volume
> things etc.

All well and good. BUT what of simple multi-volume block devices?
Requiring userland to use EXT2 to get RAID or multivolume is broken.
I just think MD is not the way to go about it.

> This obsoletes the LVM abstraction layer which i think is not "the unix way"
> i think of it like doing everything with small functional "LEGO bricks"

Hmmm... You just contradicted yourself if I read you correctly. Gumbing
up Ext[2345] with the overhead of managing block device personality is
BAD. *Allowing* the *volume management* to do it would be good. (I think)

> BTW: If you read into the kernel mailing list archive we had this discussion
> before.

Yeah... Let's NOT start this thread again. (I'm guilty, but hey...)

-Shawn
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