[Linux] Adicionar um novo disco ao LVM

Caso seu LVM esteja sem espaço para expandir partições, uma solução é adicionar outro disco ao Volume Group e então expandir a partição desejada.

Espaço em disco atual:

  [root@bacula log]# df -h
  Filesystem            Size  Used Avail Use% Mounted on
  /dev/mapper/VolGroup00-LogVol00    3.9G  3.6G   99M  98% /
  /dev/xvda1                                99M   14M   81M  15% /boot
  tmpfs                             1.0G     0  1.0G   0% /dev/shm
  10.0.2.244:/DataVolume/backup      1.8T  1.6T  267G  86% /backup

1. Particionar o disco como lvm (8e)
2. Listar os volume groups existentes [root@bacula log]# vgdisplay -s “VolGroup00” 7.88 GB [7.88 GB used / 0 free]
3. Listar os logical volumes e verificar qual é o que será modificado [root@bacula log]# lvdisplay — Logical volume — LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID ihlQed-fJQ9-ysfa-naJR-Nzzg-q9Qn-47c3EO LV Write Access read/write LV Status available # open 1 LV Size 4.00 GB Current LE 128 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:0 — Logical volume — LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID 8SvsWD-mRMp-LRLe-zecX-cdGF-EZ6G-FO1lsp LV Write Access read/write LV Status available # open 1 LV Size 3.88 GB Current LE 124 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:1
4. Criar um novo physical volume com o disco adicionado anteriormente # pvcreate /dev/xvdb1 Physical volume “/dev/xvdb1” successfully created
5. Adicionar o disco ao Volume Group desejado vgextend VolGroup00 /dev/xvdb1
6. Listar o phisical volume (pvdisplay -s) [root@bacula log]# pvdisplay -s Device “/dev/xvda2” has a capacity of 0 Device “/dev/xvdb1” has a capacity of 8.00 GB
7. Adicionar o novo disco ao volume group escolhido [root@bacula log]# vgextend VolGroup00 /dev/xvdb1 Volume group “VolGroup00” successfully extended Repare no campo Free PE / Size , existe 8GB livres que corresponde ao novo disco adicionado.
8. Extender o volume [root@bacula log]# lvextend -L +7.9G /dev/VolGroup00/LogVol00 Extending logical volume LogVol00 to 11.00 GB Logical volume LogVol00 successfully resized
9. Atualizar o espaço da partição extendida [root@bacula log]# resize2fs /dev/VolGroup00/LogVol00 resize2fs 1.39 (29-May-2006) Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required Performing an on-line resize of /dev/VolGroup00/LogVol00 to 2883584 (4k) blocks. The filesystem on /dev/VolGroup00/LogVol00 is now 2883584 blocks long.
10. Verifique se o espaço em disco está com o novo tamanho: [root@bacula log]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 11G 3.6G 6.6G 36% / /dev/xvda1 99M 14M 81M 15% /boot tmpfs 1.0G 0 1.0G 0% /dev/shm 10.0.2.244:/DataVolume/backup 1.8T 1.6T 267G 86% /backup Informações retiradas daqui: http://www.fogonacaixadagua.com.br/2009/02/adicionando-um-novo-disco-a-um-volume-lvm2-online/ e manpage

Observação

Caso tenha expandido o Logical Volume errado, você pode corrigir isso usando o lvreduce:

  [root@bacula log]# lvreduce -L -7.8G /dev/VolGroup00/LogVol01
  Rounding up size to full physical extent 7.8 GB
  WARNING: Reducing active and open logical volume to 3.91 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Do you really want to reduce LogVol01? [y/n]: y
  Reducing logical volume LogVol01 to 3.91 GB
  Logical volume LogVol01 successfully resized

Reference: [Dicas-L] Adicionar um novo disco ao LVM