[linux-lvm] LV Fragmentation determination

[Heinz J . Mauelshagen]

On Wed, Nov 06, 2002 at 01:38:03PM +0000, Joe Thornber wrote:
> On Wed, Nov 06, 2002 at 02:17:00PM +0100, Anders Widman wrote:
> > >> First off, can LV's become fragmented across a PV/VG? If yes then...
> > 
> > > Yes, they can.
> > 
> > >> 
> > >> I'm looking for an easy way to determine how fragmented an LV might been
> > >> inside the VG. Is there any command I can run that'll give me nice
> > >> estimate on this?
> > 
> > > You can analyze the "lvdisplay -v" output on your LVs in question.
> > > That shows you the mapping information and therefore, if your LVs are
> > > fragemented.
> > 
> > Will LVM include a defragment procedure?
> 
> LVM2 will at some point, in that arbitrary remappings will be
> supported.  However I'm not convinced that this is a big problem, the
> extents are 4M after all.

True.

BTW: the default got changed to 32MB to support up to 2TB LVs in
     LVM 1.0.6 by default rather than by "vgchange -s" which makes the
     impact even smaller.

> 
> - Joe
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen at Sistina.com                           +49 2626 141200
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