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LVM-Logical-Volume-Manager-for-Linux-KernelMain.LVM-Logical-Volume-Manager-for-Linux-Kernel HistoryHide minor edits - Show changes to output Changed lines 117-122 from:
%blue%Check /etc/lvm/ directory. to:
%blue%Check /etc/lvm/ directory. *Reference: http://www.linuxconfig.org/Linux_lvm_-_Logical_Volume_Manager#This_is_what_we_are_going_to_do Added lines 1-117:
%blue% How To Create LVM Logical Volume Manager And Work With With LVM *physical volumes = /dev/hdb1 *volume groups= used to create logical volumes (example 'mydatavg') *logical volumes= (example /dev/mydatavg/myvol) In LVM, Volume Groups (VGs) are split up into logical volumes (LVs) %blue%Check image at http://www.lea-linux.org/cached/printable=yes/index/Leapro-pro_sys-lvm.html *[root@galileo ~]# fdisk -l Disk /dev/sda: 80.0 GB, 80032038912 bytes 255 heads, 63 sectors/track, 9730 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 25 200781 83 Linux /dev/sda2 26 156 1052257+ 82 Linux swap /dev/sda3 157 9730 76903155 83 Linux *initialize sda3 as a physical volume [root@galileo ~]# pvcreate /dev/sda3 %blue%pvcreate - initialize a disk or partition for use by LVM *For several disks [root@galileo ~]# pvcreate /dev/sdb [root@galileo ~]# pvcreate /dev/sdc %blue%Once initialised the partitions, or drives, we will create a volume group. [root@galileo ~]#vgcreate mydatavg /dev/sda3 *vgcreate - create a volume group Here "mydatavg" is the name of the volume group. %blue%Single volume spanning two disks. [root@galileo ~]#vgcreate mydatavg /dev/sdb /dev/sdc *output of vgscan [root@galileo ~]# vgscan Reading all physical volumes. This may take a while... Found volume group "mydatavg" using metadata type lvm2 * vgscan scans all SCSI, (E)IDE disks, multiple devices and a bunch of other disk devices in the system looking for LVM physical volumes and volume groups. *Create logical volumes which we can mount and actually use. [root@galileo ~]#lvcreate -n myvol --size 1g mydatavg This command creates a volume of size 1Gb with the name myvol hosted on the LVM volume group mydatavg. %blue%The logical volume will now be accessible via= /dev/mydatavg/myvol *Formatted and mounted just like any other partition. [root@galileo ~]# mkfs.ext3 /dev/mydatavg/myvol [root@galileo ~]# mkdir /home/lvmmount [root@galileo ~]# mount /dev/mydatavg/myvolt /home/lvmmount *lvdisplay - display attributes of a logical volume [root@galileo ~]# lvdisplay *vgscan - scan all disks for volume groups and rebuild caches %red%How to Resize the volume= /dev/mydatavg/myvolt [root@galileo ~]# umount /home/lvmmount [root@galileo ~]# lvextend -L+1g dev/mydatavg/myvolt *NAME lvextend - extend the size of a logical volume -L, --size [+]LogicalVolumeSize[kKmMgGtT] Extend or set the logical volume size in units in units of megabytes. *check lvdisplay again...but ext3 filesystem on it has stayed unchanged. *We need to resize the filesystem to actually fill the volume: [root@galileo ~]# e2fsck -f /dev/mydatavg/myvolt -f Force checking even if the file system seems clean. root@lappy:~# resize2fs /dev/mydatavg/myvolt resize2fs - ext2/ext3 file system resizer %red%How to Remove LVM NAME lvremove - remove a logical volume [root@galileo ~]# lvremove /dev/mydatavg/myvolt *If partition is to be mounted at boot-time you should update your /etc/fstab /dev/mydatavg/myvolt /home/lvmmount ext3 noatime 0 2 %blue%Running pvdisplay will allow you to see which physical volume(s) make up your volume group. %blue%Check /etc/lvm/ directory. |