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Logical Volume
2011/05/09 |
| [1] | Create a Logical Volume |
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# create a Logical Volumes 'lv_data' as 50G in volume group 'vg_data' [root@dlp ~]# lvcreate -L 50G -n lv_data vg_data Logical volume "lv_data" created |
| [2] | Display status of Logical Volumes |
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[root@dlp ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_data/lv_data VG Name vg_data LV UUID Am3T89-eeB2-0dOd-ic1H-HDsG-bFJL-DFENt9 LV Write Access read/write LV Status available # open 0 LV Size 50.00 GB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 |
| [3] | Rename a Logical Volume |
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[root@dlp ~]# lvrename vg_data lv_data lv_storage # rename from "lv_data" to "lv_storage" Renamed "lv_data" to "lv_storage" in volume group "vg_data" [root@dlp ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_data/lv_storage # changed VG Name vg_data LV UUID Am3T89-eeB2-0dOd-ic1H-HDsG-bFJL-DFENt9 LV Write Access read/write LV Status available # open 0 LV Size 50.00 GB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 |
| [4] | Output a report of Logical Volumes |
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[root@dlp ~]# lvs LV VG Attr LSize Origin Snap% Move Copy% Convert lv_storage vg_data -wi-a- 50.00G lv_home vg_dlp -wi-ao 30.63g lv_root vg_dlp -wi-ao 20.00g lv_swap vg_dlp -wi-ao 5.88g |
| [5] | Scan Logical Volumes |
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[root@dlp ~]# lvscan ACTIVE '/dev/vg_data/lv_storage' [50.00 GiB] inherit ACTIVE '/dev/vg_dlp/lv_home' [30.63 GiB] inherit ACTIVE '/dev/vg_dlp/lv_root' [20.00 GiB] inherit ACTIVE '/dev/vg_dlp/lv_swap' [5.88 GiB] inherit |
| [6] | Snapshot of a Logical Volume |
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# create a Snapshot named 'snap-lv_storage' from 'lv_storage' [root@dlp ~]# lvcreate -s -L 50G -n snap-lv_storage /dev/vg_data/lv_storage Logical volume "snap-lv_storage" created [root@dlp ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_data/lv_storage VG Name vg_data LV UUID Am3T89-eeB2-0dOd-ic1H-HDsG-bFJL-DFENt9 LV Write Access read/write LV Status available # open 0 LV Size 50.00 GB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 --- Logical volume --- LV Name /dev/vg_data/snap-lv_storage VG Name vg_data LV UUID Dy0PCV-izK5-vbC5-qoxP-3w1k-GGvw-atL2lU LV Write Access read/write LV snapshot status active destination for /dev/vg_data/lv_storage LV Status available # open 0 LV Size 50.00 GB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 |
| [7] | Extend a Logical Volume - it's possible to excute with keeping mounted |
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[root@dlp ~]# lvextend -L 100G /dev/vg_data/lv_storage # Extend to 100G Extending logical volume lv_storage to 100.00 GiB Logical volume lv_storage successfully resized [root@dlp ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_data/lv_storage VG Name vg_data LV UUID Am3T89-eeB2-0dOd-ic1H-HDsG-bFJL-DFENt9 LV Write Access read/write LV Status available \# open 0 LV Size 100.00 GiB # changed Current LE 25600 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 [root@dlp ~]# resize2fs /dev/vg_data/lv_storage resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VZ/FD3S is mounted on /; on-line resizing required Resizing the filesystem on /dev/vg_data/lv_storage to 39321600 (4k) blocks. The filesystem on /dev/vg_data/lv_storage is now 39321600 blocks long. |
| [8] | Reduce a Logical Volume - This destroys a file system, so Take Back-up first. |
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[root@dlp ~]# lvreduce -L 50G /dev/vg_data/lv_storage # Reduce to 50G WARNING: Reducing active logical volume to 50.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv_storage? [y/n]: y Reducing logical volume lv_storage to 50.00 GiB Logical volume lv_storage successfully resized [root@dlp ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_data/lv_storage VG Name vg_data LV UUID Am3T89-eeB2-0dOd-ic1H-HDsG-bFJL-DFENt9 LV Write Access read/write LV Status available \# open 0 LV Size 50.00 GB # changed Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3
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| [9] | Remove Logical Volume - unmount a file system first. |
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[root@dlp ~]# lvremove /dev/vg_data/lv_storage Do you really want to remove active logical volume lv_storage? [y/n]: y Logical volume "lv_storage" successfully removed |