[linux-lvm] expanding physical disks

Hugo Lombard hal at mailgate.net
Fri Jun 15 15:57:38 UTC 2001

On Fri, Jun 15, 2001 at 04:51:35PM +0200, Heinz J. Mauelshagen wrote:
> On Fri, Jun 15, 2001 at 04:11:51PM +0200, Hugo Lombard wrote:
> > 
> > If you're using LVM primarily as a way to make it possible for you to
> > expand your storage space on-line (and on-mount-point) wouldn't it be
> > "easier" to _just_ use the RAID? i.e. expand the RAID volume on the
> > controller, so basically the "disk" is bigger now, and the just "grow"
> > your partition, extend your filesystem, and that's it?
> I think you're right in case you can live with the restrictions involved.

I'm right!?!?! Mother would be so proud!! ;)

> If the amount of resizable volumes a single smart controller can support is
> enough, you can surely go with that solution. When it comes to more storage
> you need a logical volume manager to group multiple disk subsystems together
> in order to support large storage configurations.

*nod*  As usual, there's no universal answer, and it depends on you
needs/configuration/preference/phase of moon...

> > 
> > It's a thought I've been toying with since seeing the IBM ServeRAID's
> > capability to grow volumes.  I've not attempted any testing though, so
> > this is pure speculation...
> > 
> > (PS: All this means nothing if you're using LVM for it's other
> > features, like striping, but then the RAID can do that too...)
> Plus LVM's features to move data around online in order to relocate it to
> faster/bigger/newer disk subsystems, to have more that just a couple of 
> resizable devices, support for hardware block device reconfiguration without
> any changes in the namespace of the logical volumes, snapshot support etc.

Very important features to consider, for sure.

Dorothy:	But how can you talk without a brain?
Scarecrow:	Well, I don't know... but some people without brains
		do an awful lot of talking.
		-- The Wizard of Oz
 Hugo Lombard                    Infoline (Pty) Ltd
 System Administrator

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