[linux-lvm] Resize VG

[linux-lvm] Resize VG

[Mimmus]

Hi,
this is my setup:
- server HP Proliant DL740 with Red Hat AS 3 (kernel 2.4.21-9ELsmp) with all
updates installed
- two Host Bus Adapter FC2214 with qla2x00 driver from HP (v.6.06.50)
- a SAN with an HP EVA3000 disk-array
- LVM

Does LVM support extending LUN size?
I extended size of an existing LUN from my disk-array manager but vgdisplay
shows me always the original size (with no free physical extents). No change
if I reboot, I need to destroy and re-create volume group.

Have I some other chance?

Thanks
Domenico Viggiani

RE: [linux-lvm] Resize VG

[Zecha, Holger]

Hello,

No chance, the size is fixed and written to the LUN by issuing the
pvcreate command.

Best regards

-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com]
On Behalf Of Mimmus
Sent: Wednesday, June 30, 2004 16:58
To: linux-lvm@redhat.com
Subject: [linux-lvm] Resize VG


Hi,
this is my setup:
- server HP Proliant DL740 with Red Hat AS 3 (kernel 2.4.21-9ELsmp) with
all updates installed
- two Host Bus Adapter FC2214 with qla2x00 driver from HP (v.6.06.50)
- a SAN with an HP EVA3000 disk-array
- LVM

Does LVM support extending LUN size?
I extended size of an existing LUN from my disk-array manager but
vgdisplay shows me always the original size (with no free physical
extents). No change if I reboot, I need to destroy and re-create volume
group.

Have I some other chance?

Thanks
Domenico Viggiani


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Re: [linux-lvm] Resize VG

[Luca Berra]

On Wed, Jun 30, 2004 at 04:57:58PM +0200, Mimmus wrote:
>Does LVM support extending LUN size?
LVM1 does not support extending lun size.

>I extended size of an existing LUN from my disk-array manager but vgdisplay
>shows me always the original size (with no free physical extents). No change
>if I reboot, I need to destroy and re-create volume group.

did you partition the lun or are you using a whole device?
in the former case you can add a second partition, in the latter your
only chance is to reduce the lun again and assign the space as a new
lun, iirc you should be able to allocate more than one lun from the same disk group. i
am not that sure about reducing.
Watch out for the maximum number of sd devices in the kernel which is probably limited to 
40 (CONFIG_SD_EXTRA_DEVS)

L.


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Luca Berra -- bluca@comedia.it
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RE: [linux-lvm] Resize VG

[Mimmus]

----Original Message-----

> [mailto:linux-lvm-bounces@redhat.com]On Behalf Of Luca Berra

> Sent: Wednesday, June 30, 2004 8:59 PM

>

> >Does LVM support!extending LUN size?

> LVM1 does not support!extending lun size.

Hi Luca,

thank you for your clarification.

Sorry for obvious question: does LVM2 support extending LUN size? What is
the current status of LVM2?



Bye

Domenico

Re: [linux-lvm] Resize VG

[Luca Berra]

On Thu, Jul 01, 2004 at 09:13:23AM +0200, Mimmus wrote:
>Sorry for obvious question: does LVM2 support extending LUN size? What is
there was a plan for a pvresize command for lvm2 but it is not ready
yet, it should be possible to extend a pv by doing a vgcfgbackup,
editing the ascii backup file and doing a vgcfgrestore, search for a
mail from heinz in the archives explaining this.
>the current status of LVM2?
>
lvm2 is working fine, provided you use a very recent 2.6 kernel or the
udm patchset, the mirror target used by pvmove is not yet finished iirc.
unfortunately lvm2 is not supported by RHAS 3.0

L.

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