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Operating Systems Linux Red Hat Resizing root virtual disk on the CentOS Post 302591843 by sds9985 on Saturday 21st of January 2012 01:03:41 AM
Old 01-21-2012
I think fdisk will show you that the size of the disk has changed, but the size of the partition being used as the pv for LVM hasn't changed. The space you added is just now shown as free space on the disk. I'd use fdisk to create another partition using the space you added. Then pvcreate on the new partition (probably /dev/sda3), add it to the volume group with vgextend, extend the logical volume with lvextend and then resize the filesystem with resize2fs.

Something like this (after creating the new partition with fdisk and assuming you added 10GB):

Code:
 
# pvcreate /dev/sda3
# vgextend rootvg /dev/sda3
# lvextend -L +10G /dev/rootvg/rootlv
# resize2fs -p /dev/rootvg/rootlv

Adjust the size added and the name of the vg and lv to fit your situation...

BTW, we'd usually just add another virtual disk to the guest, pvcreate it, vgextend the volume group onto it, lvextend the lv and resize2fs the filesystem. That way, you're not trying to resize or repartition a live disk.

Also, if you add another virtual disk and are going to use the whole thing as a pv, you don't need to have a partition table or to create a partition - just use the name of the whole disk.

Code:
 
pvcreate /dev/sdb
vgextend rootvg /dev/sdb
... and so on

Cheers!
 

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VGEXTEND(8)						      System Manager's Manual						       VGEXTEND(8)

NAME
vgextend - add physical volumes to a volume group SYNOPSIS
vgextend [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--restoremissing] [-f|--force] [-t|--test] [-v|--verbose] [ PHYSICAL DEVICE OPTIONS ] VolumeGroupName PhysicalDevicePath [PhysicalDevicePath...] DESCRIPTION
vgextend allows you to add one or more initialized physical volumes ( see pvcreate(8) ) to an existing volume group to extend it in size. Moreover, it allows you to re-add a physical volume that has gone missing previously, due to a transient device failure, without re-ini- tialising it. Use vgextend --restoremissing to that effect. If PhysicalDevicePath was not previously configured for LVM with pvcreate (8), the device will be initialized with the same default values used with pvcreate. If non-default pvcreate values are are desired, they may be given on the commandline with the same options as pvcre- ate. See PHYSICAL DEVICE OPTIONS for available options. Note that the restore-related options such as --restorefile, --uuid, and --physi- calvolumesize are not available. If a restore operation is needed, use pvcreate (8) and vgcfgrestore (8). OPTIONS
See lvm for common options. PHYSICAL DEVICE OPTIONS
The following options are available for initializing physical devices in the volume group. These options are further described in the pvcreate man page. -f, --force -y, --yes -Z, --zero y|n --labelsector sector --metadatasize size [--metadataignorey|n] --pvmetadatacopies copies --dataalignment alignment --dataalignmentoffset alignment_offset Examples "vgextend vg00 /dev/sda4 /dev/sdn1" tries to extend the existing volume group "vg00" by the new physical volumes (see pvcreate(8) ) "/dev/sdn1" and /dev/sda4". SEE ALSO
lvm(8), vgcreate(8), vgreduce(8), pvcreate(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGEXTEND(8)
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