Lvm
De la LinuxWiki
Logical Volume Management
/etc/lvm/ ├── archive │ └── vg_hac_00000-1700057975.vg ├── backup │ └── vg_hac ├── cache └── lvm.conf
- pvs
- Afiseaza volumele fizice (/dev/sda, /dev/sdb)
PV VG Fmt Attr PSize PFree /dev/sda2 vg_hac lvm2 a- 297.59g 0
- vgs
- Afiseaza grupurile de volume
VG #PV #LV #SN Attr VSize VFree vg_hac 1 3 0 wz--n- 297.59g 0
- lvs
- Afiseaza volumele logice
LV VG Attr LSize Origin Snap% Move Log Copy% Convert lv_home vg_hac -wi-ao 243.66g lv_root vg_hac -wi-ao 50.00g lv_swap vg_hac -wi-ao 3.94g
- pvdisplay
- Afiseaza informatii detaliate a volumelor fizice
--- Physical volume --- PV Name /dev/sda2 VG Name vg_hac PV Size 297.60 GiB / not usable 8.00 MiB Allocatable yes (but full) PE Size 32.00 MiB Total PE 9523 Free PE 0 Allocated PE 9523 PV UUID 7Zlwyr-Fi4O-ghqR-3Ue8-mTfb-fSuU-nHZBZU
- vgdisplay
- Afiseaza informatii detaliate a grupurilor de volume
--- Volume group --- VG Name vg_hac System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 297.59 GiB PE Size 32.00 MiB Total PE 9523 Alloc PE / Size 9523 / 297.59 GiB Free PE / Size 0 / 0 VG UUID 5Z6bIC-jQH3-UGEB-ocHl-MEZ0-DWgz-zY9DDY
- lvdisplay
- Afiseaza informatii detaliate a volumelor logice
--- Logical volume --- LV Name /dev/vg_hac/lv_swap VG Name vg_hac LV UUID EdH542-Ytf3-dBQN-ZrKb-izYW-Dnz9-ARYS1g LV Write Access read/write LV Status available # open 2 LV Size 3.94 GiB Current LE 126 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/vg_hac/lv_home VG Name vg_hac LV UUID y4syb5-IdOW-gOSp-VS1Q-QQkg-6w4N-GxuJlg LV Write Access read/write LV Status available # open 1 LV Size 243.66 GiB Current LE 7797 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Logical volume --- LV Name /dev/vg_hac/lv_root VG Name vg_hac LV UUID IN0cNG-WYn7-7Oc7-UpKT-1CZC-tfgf-P5Qzqg LV Write Access read/write LV Status available # open 1 LV Size 50.00 GiB Current LE 1600 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1
- pvcreate
- Creaza un nou volum fizic
- vgcreate
- Creaza un nou grup
- lvcreate
- Creaza un volum logic nou
- lvcreate -L 3000 VolGroup01
Logical volume “lvol0” created (Ca si default toate volumele iau numele lvol#) lvcreate –L 3000 –n Nume vg_group01 (Numele va fi Nume)
- vgextend
- Extinde un grup
- lvextend
- Extinde un volum logic
- lvresize
- Redimensioneaza un volum logic
- lvreduce
- Micsoreaza un volum logic
- lvrename
- Redenumeste un volum logic
- lvrename /dev/vg_group01/lvol0 /dev/vg_group01/NumeSecret
Renamed “lvol0” to “NumeSecret” in volume group “vg_group01”
- pvmove
- Muta/migreaza datele de pe un volum fizic pe altul
- vgreduce
- Micsoreaza un grup
- pvremove
- Sterge un volum fizic
- vgremove
- Sterge un grup
- lvremove
- Sterge un volum logic
Extenti fizici - masoara nivelul grupurilor de volume Extenti logici - masoara nivelul volumelor logice
Volumele fizice sunt limitate la un singur disc fizic sau o singura partitie a unui disc fizic pentru un volum fizic. Cand grupurile de volume sunt create si initializate, volumele fizice sunt impartite in extenti fizici (unitatea de masura pentru LVM, default 4Mb).
Resurse:
http://video.google.com/videoplay?docid=-6907825739273484740#
