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Logical Volumes
2011/03/13 |
| [1] | Create a Logical Volume |
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# create a Logical Volumes 'ZETA' as 10G space in volume group 'VZ' root@debian:~# lvcreate -L 10G -n ZETA VZ Logical volume "ZETA" created |
| [2] | Display status of Logical Volumes |
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root@debian:~# lvdisplay --- Logical volume --- LV Name /dev/VZ/ZETA VG Name VZ LV UUID H2yACr-cS7P-12lK-miFt-r8ay-FSTF-ETjDEL LV Write Access read/write LV Status available # open 0 LV Size 10.00 GB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35 |
| [3] | Change name of Logical Volume |
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root@debian:~# lvrename VZ ZETA FD3S # change from ZETA to FD3S root@debian:~# lvdisplay --- Logical volume --- LV Name /dev/VZ/FD3S # changed VG Name VZ LV UUID H2yACr-cS7P-12lK-miFt-r8ay-FSTF-ETjDEL LV Write Access read/write LV Status available # open 0 LV Size 10.00 GB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35 |
| [4] | Output a report of Logical Volumes |
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root@debian:~# lvs LV VG Attr LSize Origin Snap% Move Copy% FD3S VZ -wi-a- 10.00G |
| [5] | Scan Logical Volumes |
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root@debian:~# lvscan ACTIVE '/dev/VZ/FD3S' [10.00 GB] inherit |
| [6] | Snapshot of a Logical Volume |
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# create a snapshot of 'FD3S' as named 'SNAP' root@debian:~# lvcreate -s -L 5G -n SNAP /dev/VZ/FD3S Logical volume "SNAP" created root@debian:~# lvdisplay --- Logical volume --- LV Name /dev/VZ/FD3S VG Name VZ LV UUID H2yACr-cS7P-12lK-miFt-r8ay-FSTF-ETjDEL LV Write Access read/write LV Status available # open 0 LV Size 10.00 GB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35 --- Logical volume --- LV Name /dev/VZ/SNAP VG Name VZ LV UUID GShHon-lVHr-sH0W-S8jr-zYS6-aR3o-9oepmv LV Write Access read/write LV snapshot status active destination for /dev/VZ/FD3S LV Status available # open 0 LV Size 10.00 GB Current LE 2560 COW-table size 5.00 GB COW-table LE 1280 Allocated to snapshot 0.00% Snapshot chunk size 8.00 KB Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35 |
| [7] | Extend a Logical Volume - it's possible to excute with keeping mounted |
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root@debian:~# lvextend -L 20G /dev/VZ/FD3S # extend to 20G Extending logical volume FD3S to 20.00 GB Logical volume FD3S successfully resized root@debian:~# lvdisplay --- Logical volume --- LV Name /dev/VZ/FD3S VG Name VZ LV UUID H2yACr-cS7P-12lK-miFt-r8ay-FSTF-ETjDEL LV Write Access read/write LV Status available # open 0 LV Size 20.00 GB # changed Current LE 5120 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35 root@debian:~# resize2fs /dev/VZ/FD3S # resize resize2fs 1.39 (29-May-2006) Filesystem at /dev/VZ/FD3S is mounted on /; on-line resizing required Performing an on-line resize of /dev/VZ/FD3S to 5242880 (4k) blocks. The filesystem on /dev/VZ/FD3S is now 5242880 blocks long. |
| [8] | Reduce a Logical Volume - This destroys file system, so Backup first. |
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root@debian:~# lvreduce -L 10G /dev/VZ/FD3S # reduce to 10G WARNING: Reducing active logical volume to 10.00 GB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce FD3S? [y/n]: y # Yes Reducing logical volume FD3S to 10.00 GB Logical volume FD3S successfully resized root@debian:~# lvdisplay --- Logical volume --- LV Name /dev/VZ/FD3S VG Name VZ LV UUID H2yACr-cS7P-12lK-miFt-r8ay-FSTF-ETjDEL LV Write Access read/write LV Status available # open 0 LV Size 10.00 GB # changed Current LE 2560 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:35
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| [9] | Remove Logical Volume - unmount file system first. |
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root@debian:~# lvremove /dev/VZ/FD3S # remove Do you really want to remove active logical volume "FD3S"? [y/n]: y Logical volume "FD3S" successfully removed |