[linux-lvm] Split LV mirror or something

[linux-lvm] Split LV mirror or something

[Levy Abinajm Melero Sant'Anna]

[-- Attachment #1: Type: text/plain, Size: 697 bytes --]

Hi all,

I have one question about the LV mirrors.

Anytime that I think about LV mirrors I think that it should be the response
for all the issues.
If I could control the mirrors in the way that I would know each PE
location, and could split the PE mirrors on different LVs it would resolve
almost the problems regarding LV migrations with more security and speed
than snapshot and/or copy the data inside LV.

The question is:

I have one LV with some critical data, and want to make a safe copy with
less time possible of downtime. Could I make one mirror on a new PV
(lvconvert -m1) and split this copy into a new LV or/and maybe split the VG
into a new VG?

Thank you so much,
Levy Sant'Anna

[-- Attachment #2: Type: text/html, Size: 743 bytes --]

[linux-lvm] Re: Split LV mirror or something

[Levy Abinajm Melero Sant'Anna]

[-- Attachment #1: Type: text/plain, Size: 983 bytes --]

There is no comment or answer?

On Sat, Jun 28, 2008 at 3:43 PM, Levy Abinajm Melero Sant'Anna <
levy.santanna@gmail.com> wrote:

> Hi all,
>
> I have one question about the LV mirrors.
>
> Anytime that I think about LV mirrors I think that it should be the
> response for all the issues.
> If I could control the mirrors in the way that I would know each PE
> location, and could split the PE mirrors on different LVs it would resolve
> almost the problems regarding LV migrations with more security and speed
> than snapshot and/or copy the data inside LV.
>
> The question is:
>
> I have one LV with some critical data, and want to make a safe copy with
> less time possible of downtime. Could I make one mirror on a new PV
> (lvconvert -m1) and split this copy into a new LV or/and maybe split the VG
> into a new VG?
>
> Thank you so much,
> Levy Sant'Anna
>

-- 
Lewis/Iceman/Levy

Google Talk! levy.santanna@gmail.com
ICQ 12913566
MSN levy.santanna@gmail.com
Meebo lewisgodus

[-- Attachment #2: Type: text/html, Size: 1394 bytes --]

Re: [linux-lvm] Re: Split LV mirror or something

[Stuart D. Gathman]

On Wed, 16 Jul 2008, Levy Abinajm Melero Sant'Anna wrote:

> > I have one LV with some critical data, and want to make a safe copy with
> > less time possible of downtime. Could I make one mirror on a new PV
> > (lvconvert -m1) and split this copy into a new LV or/and maybe split the VG
> > into a new VG?

Why not take a snapshot, and copy that to an LV on new VG ?

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

Re: [linux-lvm] Re: Split LV mirror or something

[malahal]

Stuart D. Gathman [stuart@bmsi.com] wrote:
> On Wed, 16 Jul 2008, Levy Abinajm Melero Sant'Anna wrote:
> 
> > > I have one LV with some critical data, and want to make a safe copy with
> > > less time possible of downtime. Could I make one mirror on a new PV
> > > (lvconvert -m1) and split this copy into a new LV or/and maybe split the VG
> > > into a new VG?
> 
> Why not take a snapshot, and copy that to an LV on new VG ?

More over, this is a better approach than an LVM mirror in your case.

Re: [linux-lvm] Re: Split LV mirror or something

[Levy Abinajm Melero Sant'Anna]

[-- Attachment #1: Type: text/plain, Size: 999 bytes --]

Dear Stuart and list,

I was thinking about snapshot and copy, but it looks like "less
professional" than split a LV mirror.
I can explain: When I copy is difficult to say that I kept the same
permissions and ownership; Different of a mirror, that the process really
guarantee by itself that the data is still with the same characteristic.

Thank you all,
-- 
Lewis/Iceman/Levy

Google Talk! levy.santanna@gmail.com
ICQ 12913566
MSN levy.santanna@gmail.com
Meebo lewisgodus

On Wed, Jul 16, 2008 at 11:21 AM, Stuart D. Gathman <stuart@bmsi.com> wrote:

> On Wed, 16 Jul 2008, Levy Abinajm Melero Sant'Anna wrote:
>
> > > I have one LV with some critical data, and want to make a safe copy
> with
> > > less time possible of downtime. Could I make one mirror on a new PV
> > > (lvconvert -m1) and split this copy into a new LV or/and maybe split
> the VG
> > > into a new VG?
>
> Why not take a snapshot, and copy that to an LV on new VG ?
>
> --
>              Stuart D. Gathman <stuart@bmsi.com>
>

[-- Attachment #2: Type: text/html, Size: 1542 bytes --]

Re: [linux-lvm] Re: Split LV mirror or something

[Stuart D. Gathman]

On Sun, 20 Jul 2008, Levy Abinajm Melero Sant'Anna wrote:

> I was thinking about snapshot and copy, but it looks like "less
> professional" than split a LV mirror.
> I can explain: When I copy is difficult to say that I kept the same
> permissions and ownership; Different of a mirror, that the process really
> guarantee by itself that the data is still with the same characteristic.

What kind of permissions are you talking about?  'dd' (or your favorite
raw block copy) does the same thing as a mirror.  It just copies raw blocks
verbatim.  No filesystem is involved.

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

Re: [linux-lvm] Re: Split LV mirror or something

[Bryn M. Reeves]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Levy Abinajm Melero Sant'Anna wrote:
> Dear Stuart and list,
> 
> I was thinking about snapshot and copy, but it looks like "less
> professional" than split a LV mirror.
> I can explain: When I copy is difficult to say that I kept the same
> permissions and ownership; Different of a mirror, that the process really
> guarantee by itself that the data is still with the same characteristic.

If you do a block-by-block copy (e.g. dd) then you needn't worry about
ownership/permissions. These will be preserved since you are just taking
a complete copy of the file system data.

It would be useful to have a command that could perform a data clone of
an LV in this way.

Regards,
Bryn.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)
Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org

iD8DBQFIhFYF6YSQoMYUY94RAgTvAJkBqGZRcC4g3rtmBodEe+gBT6vLzwCgtfFc
zJQpOGlDQcG5TuyyQVv+gT0=
=zeBC
-----END PGP SIGNATURE-----

Re: [linux-lvm] Re: Split LV mirror or something

[Levy Abinajm Melero Sant'Anna]

[-- Attachment #1: Type: text/plain, Size: 35 bytes --]

'dd' worked fine, thank you all!!!

[-- Attachment #2: Type: text/html, Size: 68 bytes --]