[ILUG] Small LVM issue

[Conor Wynne]

Hi all,

I've an LVM missing UUID issue.

Situation:
Added a new LUN and pvcreate /dev/sdd on it. Then added it to a VG and
extended an lv.
Then realised I needed to use half for one volgroup and the other half
for another, so did:

lvreduce -l -254 vgname etc
Which is fine as I had only added 254 extents to the VG in the first
place, and had not extended the filesystem since reiserfs doesn't
support it online.

I then did a pvremove -ff /dev/sdd and went about adding /dev/sdd1 and
/dev/sdd2 to the new lvm set.

Now I have this :
/proc/partitions :
   8    49   97667136 sdd1
   8    50   45062325 sdd2

  /dev/sdd1  [       93.14 GB] LVM physical volume
  /dev/sdd2  [       42.97 GB] LVM physical volume
(which are just empty partitions from the newly created LUN, no data on
them yet, so no worries)

  /dev/sdb   [      136.12 GB] LVM physical volume
sdb has the database, which we have not touched yet, but need to extend
by 20GB, not an issue, but I need to fix the missing UUID first.

server:/etc/lvm/backup # vgscan
  Reading all physical volumes.  This may take a while...
  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.

This is normal as /dev/sdd is no longer part of any LVM group. As sdd1
and sdd2 are.

  Couldn't find all physical volumes for volume group database.
  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.
  Couldn't find all physical volumes for volume group database.
  Volume group "database" not found
  Found volume group "system" using metadata type lvm2
server:/etc/lvm/backup #
server:/etc/lvm/backup #
server:/etc/lvm/backup #
server:/etc/lvm/backup #
server:/etc/lvm/backup #
server:/etc/lvm/backup # pvscan
  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.
  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.
  PV /dev/sdb         VG database   lvm2 [136.12 GB / 21.12 GB free]
  PV unknown device   VG database   lvm2 [136.12 GB / 136.12 GB free]

It says unknown device because I commented out the UUID for missing
device from the lvm backup configs.

  PV /dev/sda6        VG system     lvm2 [125.80 GB / 0    free]
  PV /dev/sda2        VG system     lvm2 [8.00 GB / 4.80 GB free]
  PV /dev/sdd1                      lvm2 [93.14 GB]
  PV /dev/sdd2                      lvm2 [42.97 GB]
  Total: 6 [542.15 GB] / in use: 4 [406.04 GB] / in no VG: 2 [136.12 GB]
server:/etc/lvm/backup # lvscan

  /dev/sdc: open failed: No medium found
(I know, I need to black list this, but it's not an issue)

  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.
  Couldn't find all physical volumes for volume group database.
  Couldn't find device with uuid 'BZwaqZ-zKZM-rXNo-MVuk-JfTM-MUHj-4bkTuK'.
  Couldn't find all physical volumes for volume group database.
  Volume group "database" not found

Which is not actually true, it just says this because not all members
are there.
As you can see:

  ACTIVE            '/dev/system/opt_lv' [3.00 GB] inherit
  ACTIVE            '/dev/system/root_lv' [4.00 GB] inherit
  ACTIVE            '/dev/system/srv_lv' [3.00 GB] inherit
  ACTIVE            '/dev/system/tmp_lv' [3.00 GB] inherit
  ACTIVE            '/dev/system/usr_lv' [7.00 GB] inherit
  ACTIVE            '/dev/system/var_lv' [3.00 GB] inherit
  ACTIVE            '/dev/system/home_lv' [8.00 GB] inherit
  ACTIVE            '/dev/system/backup_lv' [80.00 GB] inherit
  ACTIVE            '/dev/system/informix_lv' [4.00 GB] inherit
  ACTIVE            '/dev/system/parteor_lv' [10.00 GB] inherit
  ACTIVE            '/dev/system/public_lv' [4.00 GB] inherit

So, how can I remove theis issue without harming the dataset?
Its not that big an issue, but I'd need to be careful all the same.

Regards
Conor.