[linux-lvm] pvcreate problem on new IDE disk

[linux-lvm] pvcreate problem on new IDE disk

[Tracy R Reed]

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I just installed a new 120G IDE disk. My system currently has two 32G SCSI
disks. I intend to migrate the data off of the SCSI disks on to the IDE
disk.

My version info:

Linux home 2.4.19 #7 SMP Sat Apr 19 18:04:41 PDT 2003 i686 unknown unknown
GNU/Linux

home:~# pvcreate --version
  LVM version:     1.95.10 (2002-05-31)
  Library version: 0.96.04-ioctl-cvs (2002-08-14)
  Driver version:  1.0.8

The drive is a 120G Maxtor IDE drive. I have a 1G partition (which I will
eventually reinstall the OS onto) and a ~120G partition which I want to
initialize as a physical volume, add it to a new volume group, create some
LV's, and then copy the data from my existing disks into it. 

   Device Boot    Start       End    Blocks   Id  System
/dev/hdd1             1      4064   2048224+  83  Linux
/dev/hdd2          4065    238216 118012608   8e  Linux LVM


But when I do the pvcreate I get this error:

home:~# pvcreate /dev/hdd2
  Failed to read existing physical volume '/dev/hdd2'
  /dev/hdd2: Couldn't find device.
  Failed to setup physical volume "/dev/hdd2"

Googling on "Failed to read existing physical volume"  produces zero hits.
Nothing at all. Any ideas?

-- 
Tracy Reed      http://www.ultraviolet.org

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Re: [linux-lvm] pvcreate problem on new IDE disk

[Alasdair G Kergon]

On Sat, Apr 19, 2003 at 07:21:08PM -0700, Tracy R Reed wrote:
>   /dev/hdd2: Couldn't find device.

Two things to check first:
  Make sure that /dev/hdd2 exists and that other programs can
write/read it;
  Run 'vgscan' and then try the pvcreate again.
[vgscan needs running after new devices are added] 

Alasdair
-- 
agk@uk.sistina.com

Re: [linux-lvm] pvcreate problem on new IDE disk

[Steffen Koch]

On Sat, 19 Apr 2003 19:21:08 -0700, Tracy R Reed wrote:

>But when I do the pvcreate I get this error:
>
>home:~# pvcreate /dev/hdd2
>  Failed to read existing physical volume '/dev/hdd2'
>  /dev/hdd2: Couldn't find device.
>  Failed to setup physical volume "/dev/hdd2"

did you reboot after fdisk??

Re: [linux-lvm] pvcreate problem on new IDE disk

[Tracy R Reed]

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On Mon, Apr 21, 2003 at 12:07:15AM +0100, Alasdair G Kergon spake thusly:
> Two things to check first:
>   Make sure that /dev/hdd2 exists and that other programs can
> write/read it;

brw-rw----    1 root     disk      22,  66 Mar 14  2002 /dev/hdd2

>   Run 'vgscan' and then try the pvcreate again.
> [vgscan needs running after new devices are added] 

home:/# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "system" using metadata type lvm1
home:/# pvcreate /dev/hdd2
  Failed to read existing physical volume '/dev/hdd2'
  Physical volume "/dev/hdd2" successfully created

It still says "failed to read" etc. but then says successfully created.
Hmm...

home:/# vgextend system /dev/hdd2
  Volume group "system" successfully extended

Ok, looks like it is working ok. Now another problem...

home:/# pvmove
  Command not implemented yet.

Ugh...looks like LVM1 had it but LVM2 does not yet. Has this changed since
my version?

  LVM version:     1.95.10 (2002-05-31)

Even if pvmove is still nonexistant I guess I can put the new disk in another
VG, create LV's over there, and manually copy the data over.

Thanks for the help! 

-- 
Tracy Reed      http://www.ultraviolet.org

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Re: [linux-lvm] pvcreate problem on new IDE disk

[Heinz J . Mauelshagen]

On Sun, Apr 20, 2003 at 09:22:33PM -0700, Tracy R Reed wrote:
> On Mon, Apr 21, 2003 at 12:07:15AM +0100, Alasdair G Kergon spake thusly:
> > Two things to check first:
> >   Make sure that /dev/hdd2 exists and that other programs can
> > write/read it;
> 
> brw-rw----    1 root     disk      22,  66 Mar 14  2002 /dev/hdd2
> 
> >   Run 'vgscan' and then try the pvcreate again.
> > [vgscan needs running after new devices are added] 
> 
> home:/# vgscan
>   Reading all physical volumes.  This may take a while...
>   Found volume group "system" using metadata type lvm1
> home:/# pvcreate /dev/hdd2
>   Failed to read existing physical volume '/dev/hdd2'
>   Physical volume "/dev/hdd2" successfully created
> 
> It still says "failed to read" etc. but then says successfully created.
> Hmm...
> 
> home:/# vgextend system /dev/hdd2
>   Volume group "system" successfully extended
> 
> Ok, looks like it is working ok. Now another problem...
> 
> home:/# pvmove
>   Command not implemented yet.
> 
> Ugh...looks like LVM1 had it but LVM2 does not yet. Has this changed since
> my version?

You'll have it shortly with LVM 2.0 :)

> 
>   LVM version:     1.95.10 (2002-05-31)
> 
> Even if pvmove is still nonexistant I guess I can put the new disk in another
> VG, create LV's over there, and manually copy the data over.

Yes.

> 
> Thanks for the help! 
> 
> -- 
> Tracy Reed      http://www.ultraviolet.org

Regards,
Heinz    -- The LVM Guy --

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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