Unable to reduce the size of volume group?


 
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# 1  
Old 01-04-2012
Unable to reduce the size of volume group?

My volume group of size 200 gb.

out of which only 100 gb is used by 2 logical volumes /dev/vg00/lvol0 and /dev/vg00/lvol0 respectively (both are 50 gb each).

Whenever i use vgreduce command to reduce the size of volume group i get below error.
Code:
# vgreduce vg00 -a
  Physical volume "/dev/xvdb5" still in use

How can i reduce the volume group size to free up 100 gb?


Code:
# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg00/lvol0
  VG Name                vg00
  LV UUID                tji5FT-GuoG-jfLN-2KXg-Ra0a-6SQA-4RR4r7
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                50.00 GB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg00/lvol1
  VG Name                vg00
  LV UUID                xdqsuf-jl1U-TY1h-0fIa-kywO-I6fu-7UVSHB
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                50.00 GB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

vgdisplay

Code:
# vgdisplay
  --- Volume group ---
  VG Name               vg00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               200.00 GB
  PE Size               4.00 MB
  Total PE              51199
  Alloc PE / Size       25600 / 100.00 GB
  Free  PE / Size       25599 / 100.00 GB
  VG UUID               NL5ws1-uaxQ-Wmtm-75GZ-WnQX-S7Vd-XeHJuS

pvs

Code:
# pvs   
PV         VG   Fmt  Attr PSize   PFree   
/dev/xvdb5 vg00 lvm2 a-   200.00G 100.00G


Last edited by pinga123; 01-04-2012 at 03:18 AM..
# 2  
Old 01-04-2012
Hi,

from man page for vgreduce:
Code:
DESCRIPTION
       vgreduce  allows you to remove one or more unused physical volumes from
       a volume group.

It appears that you are actually using just one PV, so that's why the command returns error (and it is already used for LV lvol0 and lvol1).

see ya
fra
# 3  
Old 01-04-2012
Greetings Pinga,
as frappa mentionned vgreduce is to remove PVs (which are finally disk devices...), what was your intention? For you still have in that vg 100GB unallocated; is vg00 the one containing your OS?
# 4  
Old 01-04-2012
Thanks vbe i got it now.

Vbe the actual problem is this.
I have 200gb of harddisk file attached to this machine(virtual machine). But due to space crunch i have to reduce this 200 gb to 150 gb or less.

How would i go about it? Only 6.7 gb /200 gb is used till now.

Shall i use dd on base harddisk file.

p.s vg00 is not containing os.
# 5  
Old 01-04-2012
Hi pinga123,

if I understood, you'd like to use the remaining space on the PV that is non currently in use by the existing LVs?
Why don't you create new LVs and assign them to some needed mountpoint?

see ya
fra
# 6  
Old 01-04-2012
^^No its not the case i want to reduce the size of harddisk (I mean virtual harddisk for e.g vmdk file in vmware ,img file in Oracle VM).

I m using Oracle VM 2.2.

There is one more issue now.
I somehow managed to reduce the size of virtual disk from 200 to 150 but i dont see any changes.

Code:
# fdisk -l

Disk /dev/xvda: 13.3 GB, 13316728320 bytes
255 heads, 63 sectors/track, 1619 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1          12       96358+  83  Linux
/dev/xvda2              13        1357    10803712+  83  Linux
/dev/xvda3            1358        1619     2104515   82  Linux swap / Solaris

Disk /dev/xvdb: 161.0 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1       26108   209712478+   5  Extended
/dev/xvdb5               1       26108   209712447   8e  Linux LVM

Disk /dev/xvdb is changed from 161.0 GB from 200GB.
but still vgdisplay is showing 200GB????


Code:
# vgdisplay
  --- Volume group ---
  VG Name               vg00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               200.00 GB
  PE Size               4.00 MB
  Total PE              51199
  Alloc PE / Size       25600 / 100.00 GB
  Free  PE / Size       25599 / 100.00 GB
  VG UUID               NL5ws1-uaxQ-Wmtm-75GZ-WnQX-S7Vd-XeHJuS

---------- Post updated at 04:20 AM ---------- Previous update was at 04:14 AM ----------

Code:
# pvscan
  PV /dev/xvdb5   VG vg00   lvm2 [200.00 GB / 100.00 GB free]
  Total: 1 [200.00 GB] / in use: 1 [200.00 GB] / in no VG: 0 [0   ]

If you notice the above output /dev/xvdb5 is showing 200gb but actually it is 150 gb only
# 7  
Old 01-04-2012
The best would be of course to umount the filesystems of vg00 then since you have only one PV, use vgremove to remove the vg group and recreate it again...
You would have to get it to recognize the new size of your virtual PV (never tried in vmware...) that means a pvcreate...
 
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