MIMS.ME: February 2012

The original writeup for this is at the following link:
http://www.lavmug.org/wp-content/uploads/2010/04/Resize-root-partition-with-LVM.pdf

Extending “/” root partition in Linux VM with LVM
We will be extending the “/” partition from 17GB to ~27 GB – adding 10GB to “/”
The VM HD1 = 36 GB

*** Make sure you perform FULL backups of your system before doing this procedure ***

#1) Collect information about your current environment:
“df –h” --- Displays your current disk partition size:

[root@localhost lvmlog]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 17G 2.5G 13G 17% /
/dev/mapper/VolGroup00-LogVol03 713M 162M 515M 24% /tmp
/dev/mapper/VolGroup00-LogVol02 2.0G 72M 1.8G 4% /var/log
/dev/sda1 99M 19M 76M 20% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm

“pvdisplay” --- Displays attributes of the physical LVM volume. Note PVSIZE and Free PE
(Phyical Extents)

[root@localhost lvmlog]# pvdisplay
/dev/hda: open failed: No medium found *** This is OK, itʼs just the CDROM. ***
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 35.90 GB / not usable 22.10 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1148
Free PE 0
Allocated PE 1148
PV UUID sS7pDq-F8b0-oaU3-noLN-7dIv-lWSz-njgEFE

“vgdisplay” --- Displays attributes of the LVM volume group.

--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 1
Act PV 1
VG Size 35.88 GB
PE Size 32.00 MB
Total PE 1148
Alloc PE / Size 1148 / 35.88 GB
Free PE / Size 0 / 0
VG UUID sajlPQ-4izJ-PDh4-OqSg-mdh6-Iz4c-wZSUrQ

“lvdisplay” --- Displays attributes of the LVM volume group. Weʼll just look at the lv we want to
expand.

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID VOK07i-dqHt-7qK4-42zB-RT85-P89B-CXEMaI
LV Write Access read/write
LV Status available
# ope 1
LV Size 16.59 GB ----- This is the “root” partition that weʼll expand.
Current LE 531
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

#2) Cleanly Shutdown the Linux VM guest and resize Hard Disk 1:
Itʼs a good idea to remove any snapshots before doing this procedure. You should extend the
VMʼs Hard disk by using the VIC gui (under Edit Settings) OR use the service consoleʼs
VMKFSTOOLS command cli. --- Power the VM guest back on and login.

#3) Use “fdisk” to create a new partition on sda. You will be adding this
partition to your existing volume, providing additional space.

[root@localhost lvmlog]# fdisk /dev/sda

The number of cylinders for this disk is set to 6004.
There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause
problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSʼs (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p
Disk /dev/sda: 49.3 GB, 49392123904 bytes ---- HERE, you will see a larger physical disk.
255 heads, 63 sectors/track, 6004 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 4699 37640295 8e Linux LVM

Command (m for help): n
Command action
e extended
p primary partition (1-4) p
Partition number (1-4): 3
First cylinder (4700-6004, default 4700): *** Take the defaults here. You want all of the partition.
Using default value 4700
Last cylinder or +size or +sizeM or +sizeK (4700-6004, default 6004):
Using default value 6004

Command (m for help): p

Disk /dev/sda: 49.3 GB, 49392123904 bytes
255 heads, 63 sectors/track, 6004 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 4699 37640295 8e Linux LVM
/dev/sda3 4700 6004 10482412+ 83 Linux
Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): p

Disk /dev/sda: 49.3 GB, 49392123904 bytes
255 heads, 63 sectors/track, 6004 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 4699 37640295 8e Linux LVM
/dev/sda3 4700 6004 10482412+ 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.Syncing disks.

#4) Verify your additional, new partition:
[root@localhost lvmlog]# fdisk –l

Disk /dev/sda: 49.3 GB, 49392123904 bytes
255 heads, 63 sectors/track, 6004 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 4699 37640295 8e Linux LVM
/dev/sda3 4700 6004 10482412+ 8e Linux LVM

#5) Add the new disk device (/dev/sda3) to the LVM configuration: *Note:
You many need to reboot the Linux guest.

[root@localhost lvmlog]# pvcreate /dev/sda3
Device /dev/sda3 not found (or ignored by filtering). *** NEED TO REBOOT
root@localhost lvmlog]# reboot

[root@localhost lvmlog]# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created

root@localhost lvmlog]# pvdisplay

--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 35.90 GB / not usable 22.10 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1148
Free PE 0
Allocated PE 1148
PV UUID sS7pDq-F8b0-oaU3-noLN-7dIv-lWSz-njgEFE

"/dev/sda3" is a new physical volume of "10.00 GB"

--- NEW Physical volume ---
PV Name /dev/sda3
VG Name
PV Size 10.00 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID RJ7vN1-d59J-d2a0-0Zb0-H6fB-Rzd1-sAe2vZ

#6) Extend the existing Volume Group:

[root@localhost lvmlog]# vgdisplay (Letʼs verify the VG Size and Free PE / Size before we start.

--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 1
Act PV 1
VG Size 35.88 GB
PE Size 32.00 MB
Total PE 1148
Alloc PE / Size 1148 / 35.88 GB
Free PE / Size 0 / 0
VG UUID sajlPQ-4izJ-PDh4-OqSg-mdh6-Iz4c-wZSUrQ

[root@localhost lvmlog]# vgextend VolGroup00 /dev/sda3
Volume group "VolGroup00" successfully extended

[root@localhost lvmlog]# vgdisplay (Note: We now have additional Free space)

--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 2
Act PV 2
VG Size 45.84 GB
PE Size 32.00 MB
Total PE 1467
Alloc PE / Size 1148 / 35.88 GB
Free PE / Size 319 / 9.97 GB
VG UUID sajlPQ-4izJ-PDh4-OqSg-mdh6-Iz4c-wZSUrQ

#7) Extend the logical volume that contains “/”:

[root@localhost lvmlog]# lvdisplay (Letʼs just look at LogVol00 – the root vol)

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID VOK07i-dqHt-7qK4-42zB-RT85-P89B-CXEMaI
LV Write Access read/write
LV Status available
# open 1
LV Size 16.59 GB
Current LE 531
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

[root@localhost lvmlog]# lvextend -l +319 /dev/VolGroup00/LogVol00 /dev/sda3
Extending logical volume LogVol00 to 26.56 GB
Logical volume LogVol00 successfully resized

[root@localhost lvmlog]# lvdisplay (Letʼs just look at LogVol00 – the root vol)

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID VOK07i-dqHt-7qK4-42zB-RT85-P89B-CXEMaI
LV Write Access read/write
LV Status available
# open 1
LV Size 26.56 GB *** Notice the new space.
Current LE 850
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

#8) Resize the “/” root partition:

[root@localhost lvmlog]# df –h (Letʼs take a look at the FS before resize. Note “/” size)
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 17G 2.5G 13G 17% /
/dev/mapper/VolGroup00-LogVol03 713M 162M 515M 24% /tmp
/dev/mapper/VolGroup00-LogVol02 2.0G 72M 1.8G 4% /var/log
/dev/sda1 99M 19M 76M 20% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm

[root@localhost lvmlog]# resize2fs /dev/VolGroup00/LogVol00
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 6963200 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 6963200 blocks long.

[root@localhost lvmlog]# df –h (Letʼs take a look at the new size of “/”)
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 26G 2.5G 22G 11% /
/dev/mapper/VolGroup00-LogVol03 713M 162M 515M 24% /tmp
/dev/mapper/VolGroup00-LogVol02 2.0G 72M 1.8G 4% /var/log
/dev/sda1 99M 19M 76M 20% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm
Thatʼs it… Itʼs always a good idea to reboot your VM after this procedure just
to make sure all is well.

MIMS.ME

Friday, February 10, 2012

Linux: Resize root partition with LVM

Openfire memory issues

Out of memory issues in Openfire