[linux-lvm] pvextend

[linux-lvm] pvextend

[Bastian Blank]

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Hi folks

I found some mails about a pvextend but noone implemented it. If I see
it correctly, I just need to change the value of pe_count and commit the
metadata, correct?

If yes, a poor mans pvextend is vi and pvcreate with the changed
metadata backup.

Bastian

-- 
Respect is a rational process
		-- McCoy, "The Galileo Seven", stardate 2822.3

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Re: [linux-lvm] pvextend

[Alasdair G Kergon]

On Fri, Jul 08, 2005 at 06:45:36PM +0200, Bastian Blank wrote:
> I found some mails about a pvextend but noone implemented it. If I see

pvresize

> it correctly, I just need to change the value of pe_count and commit the
> metadata, correct?

No:-)
 
> If yes, a poor mans pvextend is vi and pvcreate with the changed
> metadata backup.

Yes.  


vgcfgbackup
edit file
pvcreate --restorefile --uuid
vgcfgrestore


A pvresize command needs to implement that same sequence of commands internally.
(similar to the way vgconvert works)
 
Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] pvextend

[Bastian Blank]

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On Fri, Jul 08, 2005 at 06:38:53PM +0100, Alasdair G Kergon wrote:
> On Fri, Jul 08, 2005 at 06:45:36PM +0200, Bastian Blank wrote:
> > it correctly, I just need to change the value of pe_count and commit the
> > metadata, correct?
> No:-)

Hmm?

> A pvresize command needs to implement that same sequence of commands internally.
> (similar to the way vgconvert works)

Hmm, it is not possible to change the number of PEs directly?

Bastian

-- 
There is an order of things in this universe.
		-- Apollo, "Who Mourns for Adonais?" stardate 3468.1

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Re: [linux-lvm] pvextend

[Alasdair G Kergon]

On Fri, Jul 08, 2005 at 10:42:15PM +0200, Bastian Blank wrote:
> Hmm, it is not possible to change the number of PEs directly?
 
Not without some tricky internal library changes.

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] pvextend

[Bastian Blank]

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On Fri, Jul 08, 2005 at 09:46:17PM +0100, Alasdair G Kergon wrote:
> On Fri, Jul 08, 2005 at 10:42:15PM +0200, Bastian Blank wrote:
> > Hmm, it is not possible to change the number of PEs directly?
> Not without some tricky internal library changes.

Hmm, why is this tricky?

Bastian

-- 
There's coffee in that nebula!
		-- Capt. Kathryn Janeway, Star Trek: Voyager, "The Cloud"

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Re: [linux-lvm] pvextend

[Alasdair G Kergon]

On Sat, Jul 09, 2005 at 11:35:19AM +0200, Bastian Blank wrote:
> Hmm, why is this tricky?

The device size is stored in two places, the format2 label
as well as the VG metadata, and there's no interface for
updating the first (atomically/recoverably remember) once 
the PV is part of a VG.

Alasdair
-- 
agk@redhat.com