RE: [linux-lvm] "pvchange --uuid" failed when PV is in use

RE: [linux-lvm] "pvchange --uuid" failed when PV is in use

[Page, Jennifer (RBC Dain)]

Please remove jennifer.page@rbcdain.com from distribution list. 

-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com]
On Behalf Of Shinn'ya Hoshino
Sent: Tuesday, May 24, 2005 7:32 AM
To: linux-lvm@redhat.com
Subject: [linux-lvm] "pvchange --uuid" failed when PV is in use

Hello,

I tried to "pvchange --uuid /dev/sdc1" to change of PV UUID.
But FAILED to change PV UUID on PV metadata, only changed on VG
metadata. I'm trying to correct source code, please help.

When PV is orphan, "pvchange --uuid /dev/sdc1" changes PV UUID
successfully. At this time, pvchange calls pv_write(). But when PV is in
use by VG, pvchange only calls vg_write(), pv_write() is not called.

vg_write() does not have function to change PV metadata.
Therefore, probably pvchange needs to call pv_write() to write UUID into
PV metadata. But pv_write() is forbidden to call when PV is in use by
VG. LV is not mounted... Even if there was no LV, it failed.

Please teach me why it is forbidden.
If there is a method of allowing pv_write(), I want to try it.

BTW, I want to activate VG on raw-level duplicated PV. I look for this
ML. When edit lvm.conf and "pvchange --uuid" and vgrename, it turned out
that it is possible. However, if pvchange does not function correctly,
there is no how to adopt a measure.

Best Regards,

--
/* -------------------------------------------------------------
   Shinn'ya Hoshino     mailto:s-hoshino@vx.cnt.dnes.jp.nec.com
------------------------------------------------------------- */

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[linux-lvm] duplicate PV

[Tommaso Cecchi]

Hello everyone,
I have the following problem: I want to use a snapshot mechanism external to
LVM2 (i.e. snapshot from the storage server) so it happens that I access from a
linux box two identical LUNs with the same PVID. It is not a matter of
multipathing, they just are completely different devices with the same content
(and with the same PVID of course).

What I would like to do is to use and mount the second device on a different
mount point. So:

/dev/sdd1 is the primary PV
/dev/sdf1 is the snapshot of the primary PV

The result of pvscan before the discovery is:

drdb2:~ # pvscan
   PV /dev/sde1   VG drrg2_vg      lvm2 [200.00 GB / 0    free]
   PV /dev/sdd1   VG test_vg       lvm2 [200.00 GB / 0    free]
   PV /dev/sdb1   VG oracledb_vg   lvm2 [220.00 GB / 0    free]
   PV /dev/sdc1   VG oracledb_vg   lvm2 [20.00 GB / 0    free]
   PV /dev/sda3   VG root_vg       lvm2 [59.75 GB / 47.26 GB free]
   Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0   ]

after the discovery of the new device is:

drdb2:~ # pvscan
   Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not
/dev/sdd1
   PV /dev/sde1   VG drrg2_vg      lvm2 [200.00 GB / 0    free]
   PV /dev/sdd1   VG test_vg       lvm2 [200.00 GB / 0    free]
   PV /dev/sdb1   VG oracledb_vg   lvm2 [220.00 GB / 0    free]
   PV /dev/sdc1   VG oracledb_vg   lvm2 [20.00 GB / 0    free]
   PV /dev/sda3   VG root_vg       lvm2 [59.75 GB / 47.26 GB free]
   Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0   ]

I guess this problem is the same I'd have if I copy any single byte from a 
device to another the last one resulting in having the same LVM label.

What I tried is to:

1) vgreduce:

drdb2:~ # vgreduce test_vg /dev/sdf1
   Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not
/dev/sdd1
   Physical Volume "/dev/sdf1" not found in Volume Group "test_vg"

sdf1 does not belong to test_vg

2) pvchange --uuid:

drdb2:~ # pvchange --uuid /dev/sdf1
   Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdd1 not
/dev/sdf1
   Volume group containing /dev/sdf1 has active logical volumes
   0 physical volumes changed / 1 physical volume not changed

My idea was to modify the PVID so to let LVM understand they are completely 
different devices.
How can I manage this?

Thanks for any help you may give me.
Tommaso

-- 
================================================================
|     Tommaso Cecchi                          CINECA
| System Management Group              Via Magnanelli 6/3 40033
| e-mail: t.cecchi@cineca.it             Casalecchio di Reno
| Tel: 051/6171411                         Bologna - ITALY
| Fax 051/6132198                       http://www.cineca.it
================================================================

[linux-lvm] duplicate pv.

[johon Doe]

Hi, I have a 2.6.9 kernel and I have problems to
create an vg device over a raid1 array.
Look:
sole:/usr/src/linux# cat /proc/mdstat 
Personalities : [raid1] 
md7 : active raid1 sdb2[1] sda2[0]
      244147712 blocks [2/2] [UU]
      
md1 : active raid1 sdb6[0] sda6[1]
      1951744 blocks [2/2] [UU]
      
md2 : active raid1 sdb7[0] sda7[1]
      1951744 blocks [2/2] [UU]
      
md3 : active raid1 sdb8[0] sda8[1]
      979840 blocks [2/2] [UU]
      
md4 : active raid1 sdb9[0] sda9[1]
      9767424 blocks [2/2] [UU]
      
md5 : active raid1 sdb10[0] sda10[1]
      9767424 blocks [2/2] [UU]
      
md6 : active raid1 sdb11[0] sda11[1]
      7815488 blocks [2/2] [UU]
      
md0 : active raid1 sdb5[0] sda5[1]
      96256 blocks [2/2] [UU]
      
unused devices: <none>

sole:/usr/src/linux# pvcreate /dev/md7
  Physical volume "/dev/md7" successfully created

sole:/usr/src/linux# pvdisplay 
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  --- NEW Physical volume ---
  PV Name               /dev/sda2
  VG Name               
  PV Size               232,84 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID              
lvryBm-VRK5-xL8Q-mQRm-qnXI-707c-YMc2z1

sole:/usr/src/linux# vgcreate vg00 /dev/md7
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Volume group "vg00" successfully created

sole:/usr/src/linux# lvcreate -L 240000M -n lv00 vg00
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Found duplicate PV lvryBmVRK5xL8QmQRmqnXI707cYMc2z1:
using /dev/sdb2 not /dev/sda2
  Volume group "vg00" doesn't exist
sole:/usr/src/linux# 

thx for any help
Luigi.



		
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Re: [linux-lvm] duplicate pv.

[Philipp Schmidt]

On 2004-12-11 03:42:13 -0800, johon Doe <johond@yahoo.com>
wrote in <20041211114213.76916.qmail@web52508.mail.yahoo.com>:
> Hi, I have a 2.6.9 kernel and I have problems to
> create an vg device over a raid1 array.

look t your /etc/lvm/lvm.conf, have you set md_component_detection = 1?

i wonder why this isn't set by default, who needs to use md compnents as
singel pv?


AVE!
  phils...

-- 
   {phils}--->---(mail: philipp@ppc.in-berlin.de)-->--(ircnet: phils)--,
    wenn w eine   aube ist dn      man au dran dre en                   |
         o     Schr        an muss     hc         h   (Kurt Schwitters) |
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Re: [linux-lvm] duplicate pv.

[Alasdair G Kergon]

On Sat, Dec 11, 2004 at 02:18:29PM +0100, Philipp Schmidt wrote:
> look t your /etc/lvm/lvm.conf, have you set md_component_detection = 1?
> i wonder why this isn't set by default, who needs to use md compnents as
> singel pv?
 
It *is* set to 1 by default i.e. if you don't specify 
a different value for it in the conf file.

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] duplicate pv.

[Alasdair G Kergon]

On Sat, Dec 11, 2004 at 10:38:56PM +0000, Alasdair G Kergon wrote:
> On Sat, Dec 11, 2004 at 02:18:29PM +0100, Philipp Schmidt wrote:
> > look t your /etc/lvm/lvm.conf, have you set md_component_detection = 1?
> > i wonder why this isn't set by default, who needs to use md compnents as
> > singel pv?
> It *is* set to 1 by default i.e. if you don't specify 
> a different value for it in the conf file.
 
I believe the Debian distribution may have set it to 0 at one point because
of problems in certain configurations: these cases should be fixed by 2.00.29.


Another cause of problems could be if people created a whole-disk PV 
on a device that actually held a partition table - i.e. they
ignored the partition table, even though the kernel would still be using it.

From 2.00.29, lvm2 tries to detect partitioned devices and stop you
using them directly as PVs unless you remove the partition table first.
(i.e. if it's partitioned, only the partitions can be PVs, not the whole
disk device)

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] duplicate pv.

[Philipp Schmidt]

On 2004-12-12 17:12:30 +0000, Alasdair G Kergon <agk@redhat.com>
wrote in <20041212171230.GL11338@agk.surrey.redhat.com>:
> On Sat, Dec 11, 2004 at 10:38:56PM +0000, Alasdair G Kergon wrote:
> > On Sat, Dec 11, 2004 at 02:18:29PM +0100, Philipp Schmidt wrote:
> > > look t your /etc/lvm/lvm.conf, have you set md_component_detection = 1?
> > > i wonder why this isn't set by default, who needs to use md compnents as
> > > singel pv?
> > It *is* set to 1 by default i.e. if you don't specify 
> > a different value for it in the conf file.
>  
> I believe the Debian distribution may have set it to 0 at one point because
> of problems in certain configurations: these cases should be fixed by 2.00.29.

ok, i use debian here and it had cost me one day to find this bad default
config... 

AVE!
  phils...

-- 
   {phils}--->---(mail: philipp@ppc.in-berlin.de)-->--(ircnet: phils)--,
    wenn w eine   aube ist dn      man au dran dre en                   |
         o     Schr        an muss     hc         h   (Kurt Schwitters) |
:wq!    <--(phone: +49-179-6737439)--<--(jabber: phils@jabber.ccc.de)--'

Re: [linux-lvm] duplicate pv.

[johon Doe]

--- Philipp Schmidt <philipp@ppc.in-berlin.de> wrote:

> On 2004-12-12 17:12:30 +0000, Alasdair G Kergon
> <agk@redhat.com>
> wrote in
> <20041212171230.GL11338@agk.surrey.redhat.com>:
> > On Sat, Dec 11, 2004 at 10:38:56PM +0000, Alasdair
> G Kergon wrote:
> > > On Sat, Dec 11, 2004 at 02:18:29PM +0100,
> Philipp Schmidt wrote:
> > > > look t your /etc/lvm/lvm.conf, have you set
> md_component_detection = 1?
> > > > i wonder why this isn't set by default, who
> needs to use md compnents as
> > > > singel pv?
> > > It *is* set to 1 by default i.e. if you don't
> specify 
> > > a different value for it in the conf file.
> >  
> > I believe the Debian distribution may have set it
> to 0 at one point because
> > of problems in certain configurations: these cases
> should be fixed by 2.00.29.
> 
> ok, i use debian here and it had cost me one day to
> find this bad default
> config... 
> 

hi Phils,
I have Debian and I changed the value from 0 to 1 and
viceversa, but I have the same problem.
Any other ideas ?
thx :)



		
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Re: [linux-lvm] duplicate pv.

[Philipp Schmidt]

On 2004-12-13 00:49:35 -0800, johon Doe <johond@yahoo.com>
wrote in <20041213084935.61935.qmail@web52503.mail.yahoo.com>:
> hi Phils,
> I have Debian and I changed the value from 0 to 1 and
> viceversa, but I have the same problem.
> Any other ideas ?

set remove all md components from your lv, set md_component_detection = 1,
do a pvcreate on this device, run pvscan and then add them to yor vg, 
doubleck twice (by using lvdisplay -v) the md-device has been added and
not its components.

Worked for me

AVE!
  phils...

-- 
   {phils}--->---(mail: philipp@ppc.in-berlin.de)-->--(ircnet: phils)--,
    wenn w eine   aube ist dn      man au dran dre en                   |
         o     Schr        an muss     hc         h   (Kurt Schwitters) |
:wq!    <--(phone: +49-179-6737439)--<--(jabber: phils@jabber.ccc.de)--'

Re: [linux-lvm] duplicate pv.

[Alasdair G Kergon]

On Sat, Dec 11, 2004 at 03:42:13AM -0800, johon Doe wrote:
> Hi, I have a 2.6.9 kernel and I have problems to
> create an vg device over a raid1 array.

What LVM2 version?
Please try with 2.00.29 or .30.
Make sure md_component_detection is *not* set to 0 in lvm.conf.

Alasdair
-- 
agk@redhat.com