[linux-lvm] LVM2 scalability within volume group

[Alasdair G Kergon]

On Wed, Mar 17, 2004 at 09:36:38AM -0800, Dave Olien wrote:
> Having redundant copies of meta data is a good thing.  But how about
> allowing the adminstrator to set a limit on the degree of redundancy when
> a VG is created.  You could limit a VG to having for example 10 redundant
> copies.  Then adding more PVs beyond the 10th would encounter less overhead.
> Am I missing something important?

There'll be a VG-level option for this eventually; until then, use the
pvcreate options to say how many copies of metadata you want on each PV.
e.g. pvcreate --metadatacopies 0
[Careful use of the --restorefile option lets you reduce it on a PV already in the VG.]

For complex VGs you should increase the space set aside for metadata too:
  --metadatasize

See the pvcreate man page.
 
Alasdair
-- 
agk at redhat.com