logical volumes not being detected

logical volumes not being detected

[Eduard Nicodei]

Hello, this is my first posting here and I'm sorry if this has already been 
discused. All I want to know is what other modules/libraries other than the 
device-mapper kernel module, lvm2 and the devmapper library do I need in 
order to have my logical volumes detected.
here's my setup: one 160GB sata2 hdd; one 320GB sata2 hdd; a minimal 
version of ubuntu (installed from debootstrap) and a custom compiled kernel 
version 2.6.26 (I should mention that the kernel doesn't contain all of the 
modules - I wanted it to provide only the features I need). I have created a 
physical volume, volume group and logical volume from another ubuntu 
installation. It is detected while using the live cd, and also if I 
boot the minimal ubuntu with another kernel that has a full set of 
features.

regards, Eduard

RE: logical volumes not being detected

[Romanowski, John (OFT)]

Hi,
I'm not familiar with ubuntu. In SLES one has to enable the boot.lvm script which runs vgscan and vgchange to detect and enable the PV's, VG's and their LV's.

Try manually running vgscan and then vgchange -a y
and see if that helps.
good luck.


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-----Original Message-----

From: dm-devel-bounces@redhat.com on behalf of Eduard Nicodei
Sent: Mon 7/28/2008 5:12 AM
To: dm-devel@redhat.com
Subject: [dm-devel] logical volumes not being detected
 
Hello, this is my first posting here and I'm sorry if this has already been 
discused. All I want to know is what other modules/libraries other than the 
device-mapper kernel module, lvm2 and the devmapper library do I need in 
order to have my logical volumes detected.
here's my setup: one 160GB sata2 hdd; one 320GB sata2 hdd; a minimal 
version of ubuntu (installed from debootstrap) and a custom compiled kernel 
version 2.6.26 (I should mention that the kernel doesn't contain all of the 
modules - I wanted it to provide only the features I need). I have created a 
physical volume, volume group and logical volume from another ubuntu 
installation. It is detected while using the live cd, and also if I 
boot the minimal ubuntu with another kernel that has a full set of 
features.

regards, Eduard

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Re: logical volumes not being detected

[Eduard Nicodei]

On Monday 28 July 2008 18:57:22 Romanowski, John (OFT) wrote:
> Hi,
> I'm not familiar with ubuntu. In SLES one has to enable the boot.lvm script
> which runs vgscan and vgchange to detect and enable the PV's, VG's and
> their LV's.
>
> Try manually running vgscan and then vgchange -a y
> and see if that helps.
> good luck.
>
>
> --------------------------------------------------------
> This e-mail, including any attachments, may be confidential, privileged or
> otherwise legally protected. It is intended only for the addressee. If you
> received this e-mail in error or from someone who was not authorized to
> send it to you, do not disseminate, copy or otherwise use this e-mail or
> its attachments.  Please notify the sender immediately by reply e-mail and
> delete the e-mail from your system.
>
>
> -----Original Message-----
>
> From: dm-devel-bounces@redhat.com on behalf of Eduard Nicodei
> Sent: Mon 7/28/2008 5:12 AM
> To: dm-devel@redhat.com
> Subject: [dm-devel] logical volumes not being detected
>
> Hello, this is my first posting here and I'm sorry if this has already been
> discused. All I want to know is what other modules/libraries other than the
> device-mapper kernel module, lvm2 and the devmapper library do I need in
> order to have my logical volumes detected.
> here's my setup: one 160GB sata2 hdd; one 320GB sata2 hdd; a minimal
> version of ubuntu (installed from debootstrap) and a custom compiled kernel
> version 2.6.26 (I should mention that the kernel doesn't contain all of the
> modules - I wanted it to provide only the features I need). I have created
> a physical volume, volume group and logical volume from another ubuntu
> installation. It is detected while using the live cd, and also if I boot
> the minimal ubuntu with another kernel that has a full set of features.
>
> regards, Eduard
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

sorry, neither vgscan nor vgchange -a -y didn't work. However, after twinking 
my kernel I found the problem: I had to select the "Create deprecated sysfs 
files" and the "Kernel->user space relay support (formerly relayfs)" kernel 
configuration options, (both from "General setup");
now I'm not a dm-developer so this is just a suggestion: does device-mapper 
use deprecated sysfs files? If so, it should be upgraded, or at least a 
warning be posted somewhere that dm needs those files.