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Operating Systems Linux Red Hat logical volume remove
# 1  
Old 08-27-2009
logical volume remove

I have a buch of logical volumes and I need to remove. I can able to remove them but when i remove lvm which has 5gb, i dont see
that space is alloted to root partition. Any ideas.Thanks
# 2  
Old 08-27-2009
You will not see any change in partitions. However, if you remove logical volumes, you should see a corresponding increase in free space within its volume group. You can then extend volumes within that volgroup by the new free amount and then grow its filesystem.
# 3  
Old 08-27-2009
Thanks for your reply.

I'm in confusion. I have LVM's like
/dev/mapper/VolGroup00-LogVol00 -10gb /
/dev/mapper/VolGroup00-LogVol01 -2gb /tmp
/dev/mapper/VolGroup00-LogVol03- 500mb /opt
/dev/mapper/VolGroup00-LogVol04 - 10gb /var

so if i remove /dev/mapper/VolGroup00-LogVol01, i should see 2gb free space right? how can I check that?
and also I need to increase /dev/mapper/VolGroup00-LogVol03 to 2gb from 500mb. how can i do this?
Thanks
# 4  
Old 08-27-2009
You type vgdisplay and look for Free PE. Those free physical extents are what you can allocate to LogVol03. You would use lvextend -l [extents] [path to logvol]. But after that you have to use resize2fs to grow the filesystem.
# 5  
Old 08-27-2009
Thanks it works.

---------- Post updated at 01:35 PM ---------- Previous update was at 01:15 PM ----------

it works with extending the size. But when i remove "/dev/mapper/VolGroup00-LogVol04 - 10gb /var" and I check for the Free PE with vgdisplay command, i see same free PE even after lvm. is there anything i missed? Thanks
# 6  
Old 08-27-2009
Hopefully this illustrates how it should go

Code:
[root@F10 ~]# vgdisplay Beatles
  --- Volume group ---
  VG Name               Beatles
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               2.00 GB
  PE Size               4.00 MB
  Total PE              511
  Alloc PE / Size       511 / 2.00 GB
  Free  PE / Size       0 / 0  
  VG UUID               ZEama4-bjx6-DUnz-xEAR-Zcir-YM1L-pHvZHp
  
[root@F10 ~]# lvdisplay Beatles
  --- Logical volume ---
  LV Name                /dev/Beatles/John
  VG Name                Beatles
  LV UUID                HeNEwB-HYTo-ke3G-bNYJ-W2Xu-JNze-yaZ9tE
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                512.00 MB
  Current LE             128
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
  
  --- Logical volume ---
  LV Name                /dev/Beatles/Paul
  VG Name                Beatles
  LV UUID                toWU48-FghQ-WkBy-mPxH-s9bP-ORpF-Xh6XZ7
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                512.00 MB
  Current LE             128
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3
  
  --- Logical volume ---
  LV Name                /dev/Beatles/George
  VG Name                Beatles
  LV UUID                iZivOZ-ZBoo-vSG6-1Lvn-7FcC-RAPx-GJe5mR
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                512.00 MB
  Current LE             128
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4
  
  --- Logical volume ---
  LV Name                /dev/Beatles/Ringo
  VG Name                Beatles
  LV UUID                ClIOwj-P1n0-i6MB-F4aS-CSlK-puUZ-ZAp0fn
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                508.00 MB
  Current LE             127
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:5

[root@F10 ~]# lvremove /dev/Beatles/John
Do you really want to remove active logical volume "John"? [y/n]: y
  Logical volume "John" successfully removed

[root@F10 ~]# vgdisplay Beatles
  --- Volume group ---
  VG Name               Beatles
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               2.00 GB
  PE Size               4.00 MB
  Total PE              511
  Alloc PE / Size       383 / 1.50 GB
  Free  PE / Size       128 / 512.00 MB
  VG UUID               ZEama4-bjx6-DUnz-xEAR-Zcir-YM1L-pHvZHp

There's enough room now for a new Beatles member.

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