vgcreate a LUN shows old ghost LVs on that LUN ? How to get rid of LVs?

[Sammy_2]

A 150GB EMC LUN was assigned as a shared disk on 2node cluster. This LUN was part of 70GB lun before but SAN admin reallocated it and made it 150GB. I see old LVS. How do I get of
all the LVS (67 ghost LVS) in the ops. See steps below. I tried "pvcreate -f disk" but when I vgcreate a vg , I still see all those non-existent lvs.

# vgdisplay -v ops|more
--- Volume groups ---
VG Name /dev/ops
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 0
Open LV 67
Max PV 13
Cur PV 1
Act PV 1
Max PE per PV 36684
VGDA 2
PE Size (Mbytes) 4
Total PE 36678
Alloc PE 0
Free PE 36678
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/ops/gblaidx01
..
..
..
--- Physical volumes ---
PV Name /dev/dsk/c9t0d3
PV Status available
Total PE 36678
Free PE 36678
Autoswitch On


# lvremove /dev/ops/gblaidx01

lvremove: Couldn't delete logical volume "/dev/ops/gblaidx01":
The supplied lv number refers to a non-existent logical volume.
Volume Group configuration for /dev/ops has been saved in /etc/lvmconf/ops.conf


# vgremove /dev/ops
Volume group "/dev/ops" has been successfully removed.
# pvcreate -f /dev/rdsk/c9t0d3
Physical volume "/dev/rdsk/c9t0d3" has been successfully created.

# vgcreate /dev/ops /dev/dsk/c9t0d3
Increased the number of physical extents per physical volume to 36684.
vgcreate: Volume group "/dev/ops" could not be created:
VGRA for the disk is too big for the specified parameters. Increase the
extent size or decrease max_PVs/max_LVs and try again.

# vgcreate -p 13 /dev/ops /dev/dsk/c9t0d3
Increased the number of physical extents per physical volume to 36684.
Volume group "/dev/ops" has been successfully created.
Volume Group configuration for /dev/ops has been saved in /etc/lvmconf/ops.conf

inbphes5:/tmp ==> vgdisplay -v /dev/ops|more
--- Volume groups ---
VG Name /dev/ops
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 0
Open LV 67
Max PV 13
Cur PV 1
Act PV 1
Max PE per PV 36684
VGDA 2
PE Size (Mbytes) 4
Total PE 36678
Alloc PE 0
Free PE 36678
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/ops/gblaidx01
..
..
..
--- Physical volumes ---
PV Name /dev/dsk/c9t0d3
PV Status available
Total PE 36678
Free PE 36678
Autoswitch On

[Pete Randall]

pvcreate -f


Pete

[Sammy_2]

I tried pvcreate -f but that does not help. in this case.

[Devender Khatana]

Hi,

Allthough the old LV's are not consuming any space but VGRA contains information about them & this is what you want to remove I suppose. For that fill whole LUN with null's or zero's using dd & then issue pvcreate & vgcreats commands.

HTH,
Devender

[Devender Khatana · Accepted solution]

Hi,

Do vgexport for that VG, pvremove for that LUN & then do this for that LUN 7 follow vg creation procedure, you should not find this back.

#vgexport /dev/ops
#pvremove /dev/dsk/cxtydz
#dd if=/dev/zero bs=256k of=/dev/rdsk/cxtydz

Wait as it will take long time.

Now recreate the VG.

#pvcreate /dev/rdsk/cxtydz
#mkdir /dev/ops
#mknod /dev/ops/group c 64 0x0?0000 (? should be unique in all VG's)
#vgcreate /dev/ops /dev/dsk/cxtydz
#vgdisplay -v /dev/ops |more to verify.

HTH,
Devender

[HGN]

Hi

You can do a pvcreate -f on that disk.

Rgds

HGN

[Sammy_2]

THANKS a bunch Devender. I am currently trying your solution. Have run pvremove and now am dd'ing on 150gb lun so am waiting to check once it is done. I dont see anything on the screen so hoping that it is doing something.
will keep posted.

[Devender Khatana]

Sammy,

I assume it went away after dd. Was everything else normal?

Regards,
Devender

[Sammy_2]

yes Devender, all went fine after dd. I thought dd was not working since it took over 3 hours on a 150 gb lun. Also, For some reason, I had skipped 0x010000 for minor number, and went to 0x020000. i redid my mknod with 0x010000 and all looks good. Also, had to do a pvreate -f again after dd .
great solution. once again, do appreciate your vaulable input.