Thursday 1 March 2012

Increase LVM Volume

This is how I did it on a VMWare Machine but the procedure should be the same for a phisical machine:

First off, VMWare, like many other hypervisors, allows to create a second HDD on the fly while the vm is running.

Once that was done, login into the server and:
# echo “- – -” > /sys/class/scsi_host/host#/scan
partprobe should also do the trick

Just to see that the new disk is available use:
# fdisk -l
In this case it was /dev/sdb

create a new partition with
# fdisk /dev/sdb
press n and then w

Format the new partition:
# mkfs.ext3 /dev/sdb1
list the volume groups:
# vgs
add new physical volume
# pvcreate /dev/sdb1
extend the default volume group from the vgs command
# vgextend VolGroup /dev/sdb1
check to see pv and vg has another volume with:
# vgs
And list logical volumes
# lvdisplay
extend my / volume by the entire size of /dev/sdb1
# lvextend /dev/VolGroup/lv_root/dev/sdb1
resize filesystem to match vol size increase
# resize2fs /dev/VolGroup/lv_root
(requires a 2.6 kernel to resize while fs running)

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