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FromHeinz Mauelshagen <>
SubjectRe: (reiserfs) Re: LVM / Filesystems / High availability
DateSat, 27 Jun 1998 14:21:25 METDST
> From: "Theodore Y. Ts'o" <tytso@MIT.EDU>
> Date: Fri, 26 Jun 1998 16:13:12 -0400

> A block-device LVM can do this, but at the cost of being very
> inefficient when you need retire a physical device which happens to be
> located in the middle of a filesystem, a lot more block copying needs to
> be done than if you let the filesystem simply handle it.

No matter which software user (filesystem, database etc.) is actually
performing on a LVM device, we get use of _TRANSPARENTLY_ retiring whatever
sized disk (sure, we have to have a free one of at least the same size),
because the logical adress space _NEVER_ changes while moving physical
extends around to retire disk(s)!!!

BTW: please have a look at http://www.msede.com/linux/lvm/ for terms
     and features of the LVM to clearify things


So, please let's stop the discussion:
"let's do it in the filesystem / no, let's do it in the device layer (LVM)"

Discussion about extending FSes at the _END_ and reducing them _FROM_ the end
allready started AFAIK (this one should indead go to linux-fsdevel).

I'ld always prefer mass storage admin flexibility for _ALL_
mass storage software users (maybe loosing some performance),
because we all don't retire disks all day, do we?!

BTW: LVM is a large scalabillity issue, not a desktop one

Regards, Heinz

--

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Systemmanagement Entwicklungsbereich 2           Deutsche Telekom AG
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
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mge@ez-darmstadt.telekom.de                      64205 Darmstadt
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