| create logical volume | Cannot find Physical Volumes for LVM |
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good note for creating logical volumes
system-config-lvm |
1, - initialize the SCSI disk pvcreate -> physical volumes 2. Create the volume group- vgcreate -> volume group vgdisplay 3. Create the logical volumes on the volume group lvcreate -> logical volumes 3. Create the file system on the logical volumes mkdf /dev/mo_volume_group/mo_logical_volume_name 3. Mount the file system mount /dev/mo_volume_group/mo_logical_volume_name/mnt
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Physical volumes show up in /dev
initalize the SCSI disk /dev/sdb:
# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
A volume group - the logical volumes and physical volumes in one
# vgcreate osvg /dev/sdb
Volume group "osvg" successfully created
| [root@earth dev]# vgdisplay --- Volume group --- VG Name osvg System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 8 VG Access read/write VG Status resizable MAX LV 0 Cur LV 7 Open LV 7 Max PV 0 Cur PV 1 Act PV 1 VG Size 135.87 GB PE Size 4.00 MB Total PE 34783 Alloc PE / Size 34783 / 135.87 GB Free PE / Size 0 / 0 VG UUID 7hjrr1-h7gZ-X3uO-P9RN-Vvd3-B8wT-K2vgTx |
A logical volume is like a disk partion. Create a logcial volume in an existing volume group
# lvcreate -L 10 -n my_logic_volume_name my_volume_group
Rounding up size to full physical extent 12.00 MB
Logical volume "my_logic_volume_name" created