Difference between revisions of "LVM"
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Notes on LVM |
Notes on LVM |
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# VG commands => virtual groups |
# VG commands => virtual groups |
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# LV commands => logical volumes |
# LV commands => logical volumes |
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Create a bunch of small (100MB) virtual disks for use with LVM. |
Create a bunch of small (100MB) virtual disks for use with LVM. |
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Create Virtual Group |
Create Virtual Group |
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# vgcreate lpic /dev/loop |
# vgcreate -s 1024K lpic /dev/loop[1-5] |
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Volume group "lpic" successfully created |
Volume group "lpic" successfully created |
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# pvs |
# pvs |
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PV VG Fmt Attr PSize PFree |
PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- |
/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- |
/dev/loop2 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop3 lpic lvm2 a- |
/dev/loop3 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop4 lpic lvm2 a- |
/dev/loop4 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop5 lpic lvm2 a- |
/dev/loop5 lpic lvm2 a- 99.00M 99.00M |
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/dev/sda2 VolGroup00 lvm2 a- 37.12G 0 |
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# vgs |
# vgs |
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VG #PV #LV #SN Attr VSize VFree |
VG #PV #LV #SN Attr VSize VFree |
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lpic 5 0 0 wz--n- |
lpic 5 0 0 wz--n- 495.00M 495.00M |
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Create Logical Volume |
Create Logical Volume |
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# lvcreate -n lv_lpic -L 256M lpic |
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Logical volume "lv_lpic" created |
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# lvs |
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LV VG Attr LSize Origin Snap% Move Log Copy% Convert |
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lv_lpic lpic -wi-a- 256.00M |
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== Manage == |
== Manage == |
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== |
=== Move disk === |
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Goal: move content of loop1 to loop5 |
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#pvs |
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PV VG Fmt Attr PSize PFree |
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'''/dev/loop1 lpic lvm2 a- 99.00M 0''' |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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/dev/loop4 lpic lvm2 a- 99.00M 99.00M |
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'''/dev/loop5 lpic lvm2 a- 99.00M 99.00M''' |
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# pvmove /dev/loop1 /dev/loop5 |
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/dev/loop1: Moved: 100.0% |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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'''/dev/loop1 lpic lvm2 a- 99.00M 99.00M''' |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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/dev/loop4 lpic lvm2 a- 99.00M 99.00M |
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'''/dev/loop5 lpic lvm2 a- 99.00M 0''' |
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=== Remove physical disk === |
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Goal: remove /dev/loop4 from VG ''lpic'' |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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'''/dev/loop4 lpic lvm2 a- 99.00M 99.00M''' |
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/dev/loop5 lpic lvm2 a- 99.00M 0 |
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# vgreduce lpic /dev/loop4 |
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Removed "/dev/loop4" from volume group "lpic" |
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# pvremove /dev/loop4 |
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Labels on physical volume "/dev/loop4" successfully wiped |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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/dev/loop5 lpic lvm2 a- 99.00M 0 |
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=== Add physical disk === |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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/dev/loop5 lpic lvm2 a- 99.00M 0 |
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# pvcreate /dev/loop4 |
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Physical volume "/dev/loop4" successfully created |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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'''/dev/loop4 lvm2 -- 100.00M 100.00M''' |
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/dev/loop5 lpic lvm2 a- 99.00M 0 |
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# vgextend lpic /dev/loop4 |
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Volume group "lpic" successfully extended |
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# pvs |
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PV VG Fmt Attr PSize PFree |
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/dev/loop1 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop2 lpic lvm2 a- 99.00M 0 |
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/dev/loop3 lpic lvm2 a- 99.00M 41.00M |
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/dev/loop4 lpic lvm2 a- 99.00M 99.00M |
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/dev/loop5 lpic lvm2 a- 99.00M 0 |
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Latest revision as of 15:49, 11 February 2011
Notes on LVM
- PV commands => working on physical volume aka disk
- VG commands => virtual groups
- LV commands => logical volumes
Create
Create a bunch of small (100MB) virtual disks for use with LVM.
DISK_DIR=/var/tmp/disks
mkdir -p ${DISK_DIR} &&
for i in 1 2 3 4 5; do
dd if=/dev/zero of=${DISK_DIR}/disk${i} bs=100M count=1 &&
losetup /dev/loop${i} ${DISK_DIR}/disk${i} &&
pvcreate /dev/loop${i}
done
Output should look like this
1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 0.50751 s, 207 MB/s Physical volume "/dev/loop1" successfully created 1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 1.94502 s, 53.9 MB/s Physical volume "/dev/loop2" successfully created 1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 4.12227 s, 25.4 MB/s Physical volume "/dev/loop3" successfully created 1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 1.51487 s, 69.2 MB/s Physical volume "/dev/loop4" successfully created 1+0 records in 1+0 records out 104857600 bytes (105 MB) copied, 3.88262 s, 27.0 MB/s Physical volume "/dev/loop5" successfully created
Confirm the output
# pvs PV VG Fmt Attr PSize PFree /dev/loop1 lvm2 -- 100.00M 100.00M /dev/loop2 lvm2 -- 100.00M 100.00M /dev/loop3 lvm2 -- 100.00M 100.00M /dev/loop4 lvm2 -- 100.00M 100.00M /dev/loop5 lvm2 -- 100.00M 100.00M
Create Virtual Group
# vgcreate -s 1024K lpic /dev/loop[1-5] Volume group "lpic" successfully created # pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 99.00M /dev/loop3 lpic lvm2 a- 99.00M 99.00M /dev/loop4 lpic lvm2 a- 99.00M 99.00M /dev/loop5 lpic lvm2 a- 99.00M 99.00M /dev/sda2 VolGroup00 lvm2 a- 37.12G 0 # vgs VG #PV #LV #SN Attr VSize VFree lpic 5 0 0 wz--n- 495.00M 495.00M
Create Logical Volume
# lvcreate -n lv_lpic -L 256M lpic Logical volume "lv_lpic" created # lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert lv_lpic lpic -wi-a- 256.00M
Manage
Move disk
Goal: move content of loop1 to loop5
#pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 0 /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop4 lpic lvm2 a- 99.00M 99.00M /dev/loop5 lpic lvm2 a- 99.00M 99.00M # pvmove /dev/loop1 /dev/loop5 /dev/loop1: Moved: 100.0% # pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop4 lpic lvm2 a- 99.00M 99.00M /dev/loop5 lpic lvm2 a- 99.00M 0
Remove physical disk
Goal: remove /dev/loop4 from VG lpic
# pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop4 lpic lvm2 a- 99.00M 99.00M /dev/loop5 lpic lvm2 a- 99.00M 0 # vgreduce lpic /dev/loop4 Removed "/dev/loop4" from volume group "lpic" # pvremove /dev/loop4 Labels on physical volume "/dev/loop4" successfully wiped # pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop5 lpic lvm2 a- 99.00M 0
Add physical disk
# pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop5 lpic lvm2 a- 99.00M 0 # pvcreate /dev/loop4 Physical volume "/dev/loop4" successfully created # pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop4 lvm2 -- 100.00M 100.00M /dev/loop5 lpic lvm2 a- 99.00M 0 # vgextend lpic /dev/loop4 Volume group "lpic" successfully extended # pvs PV VG Fmt Attr PSize PFree /dev/loop1 lpic lvm2 a- 99.00M 99.00M /dev/loop2 lpic lvm2 a- 99.00M 0 /dev/loop3 lpic lvm2 a- 99.00M 41.00M /dev/loop4 lpic lvm2 a- 99.00M 99.00M /dev/loop5 lpic lvm2 a- 99.00M 0