Remove unused space from Vg LVM2

[Sagitter]

Hi to all,

this is my situation: on a LVM2 partition, i have shrink a logical volume to free new space for a new partition.

My system-config-lvm screen: http://forums.fedoraforum.org/attach...1&d=1258988216

Outputs:

# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               test_vg
  PV Size               3.68 GB / not usable 701.05 MB
  Allocatable           yes 
  PE Size (KByte)       1048576
  Total PE              3
  Free PE               1
  Allocated PE          2
  PV UUID               NNa3jQ-Pil1-hkIV-BPtb-0Y8v-NWbB-XkfsRH

# vgdisplay
  --- Volume group ---
  VG Name               test_vg
  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               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               3.00 GB
  PE Size               1.00 GB
  Total PE              3
  Alloc PE / Size       2 / 2.00 GB
  Free  PE / Size       1 / 1.00 GB
  VG UUID               Zf0m1R-DXrr-ixrq-4bG7-kQNq-PX6X-SVum33

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/test_vg/lvol0
  VG Name                test_vg
  LV UUID                id7Emy-Sj5W-2e1X-57RD-lFua-5tlp-3q0Qgv
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                1.00 GB
  Current LE             1
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Name                /dev/test_vg/lvol1
  VG Name                test_vg
  LV UUID                GBmXa1-RYrH-ggy0-f09X-ByIt-4B1H-K23shR
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                1.00 GB
  Current LE             1
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

# vgs
  VG      #PV #LV #SN Attr   VSize VFree
  test_vg   1   2   0 wz--n- 3.00G 1.00G

I have tried to export out from LVM, the new free space by these command:

# vgreduce -a test_vg

or

# vgreduce --removemissing test_vg

but without success.

Where am I wrong?
Thanks.

Sagitter

[SlowJet]

"i have shrink a logical volume to free new space for a new partition."

That only makes freespace in the VG, the PV(and underlying 8e partition) has not changed.
The new VG freespace can be used for another LV.

PE Size 1.00 GB - This s/b 4MB and is the default( or 32MB for big LV's or many PV/VG's)

I recommend starting over with the sdb1,
and use command line.
But I don't know what your intentions are, new LV, new partition for ?, just confused at 701MB of wasted space? so ...

SJ

[Sagitter]

Hi Slowjet,

But I don't know what your intentions are, new LV, new partition for ?, just confused at 701MB of wasted space? so ...

I want to take out free space, from volume group; to have new unallocated partition.

[SlowJet]

lvm pvremove /dev/sdb1

fdisk /dev/sdb1

remove the the partition
create new sdb partitions as needed (with size, type)

when done, save the partition table and exit.

formart each partition with the correct file system according to it type.

83 mkfs.ext4 /dev/sdbn
82 mkswap /dev/sdbn


SJ.

[Sagitter]

# lvm pvremove /dev/sdb1
  Can't pvremove physical volume "/dev/sdb1" of volume group "test_vg" without -ff

# pvremove -ff  /dev/sdb1
Really WIPE LABELS from physical volume "/dev/sdb1" of volume group "test_vg" [y/n]? y
  WARNING: Wiping physical volume label from /dev/sdb1 of volume group "test_vg"
  Labels on physical volume "/dev/sdb1" successfully wiped

# vgdisplay
#

Remove LVM. I don't want that.


I wish to take off only the unused space.

[SlowJet]

That's a safety feature.
I assume you have not extended any LV onto the test_vg (according to the vgdisplay and lvdisplay)


remove each piece

lvm lvremove /dev/mapper/test_vg-lvol1 /dev/mapper/test_vg-lvol0
lvm vgremove test_vg
lvm pvremove /dev/sdb1

SJ

[Sagitter]

I will try later, thank you.

[SlowJet]

Originally Posted by Sagitter

# lvm pvremove /dev/sdb1
  Can't pvremove physical volume "/dev/sdb1" of volume group "test_vg" without -ff

# pvremove -ff  /dev/sdb1
Really WIPE LABELS from physical volume "/dev/sdb1" of volume group "test_vg" [y/n]? y
  WARNING: Wiping physical volume label from /dev/sdb1 of volume group "test_vg"
  Labels on physical volume "/dev/sdb1" successfully wiped

# vgdisplay
#

Remove LVM. I don't want that.


I wish to take off only the unused space.

Attachment 18532

Well, I didn't see the forced part with the y.
But sdb1 is just a partition of type 8e now.
You had to remove LV's and VG to get rid of the 1GB PE size anyway.
You can not define a partition inside a PV/VG freespace.
So make the 8e partition for LVM smaller if you really want another partition(s).
otherwise
lvm pvcreate /dev/sdb1
lvm vgcreate --physicalextentsize 4M VolGroup1101 /dev/sdb1

then you can create LV's as needed.
lvm lvcreate --size nnnnM --name LogVol1101bkup VolGroup1101 /dev/sdb1

SJ

[Sagitter]

Well, I didn't see the forced part with the y.
But sdb1 is just a partition of type 8e now.
You had to remove LV's and VG to get rid of the 1GB PE size anyway.
You can not define a partition inside a PV/VG freespace.
So make the 8e partition for LVM smaller if you really want another partition(s).
otherwise
lvm pvcreate /dev/sdb1
lvm vgcreate --physicalextentsize 4M VolGroup1101 /dev/sdb1

then you can create LV's as needed.
lvm lvcreate --size nnnnM --name LogVol1101bkup VolGroup1101 /dev/sdb1

Ok. Thank you.

[gattler]

Can someone please provide a simple ABC, child and fire proof step-to-step guide on how to

1) EXTRACT Unused Space from a Volume Group
2) CREATE a good old fashioned Partition out of this afformentioned Unused Space.

This can't be so hard, can it? I really miss the old days of pre-LVM.