Add new disk using LVM on RedHat AS 4.0

[Gulam Mohiuddin]

Hi,

I need to use one disk already installed on my Linux Server:

Red Hat AS 4.0:

Note: (Physical Volume pvcreate is already performed by someone else).

1. Create new Volume Group VolGroup01 using (/dev/sdb1).
2. Create new Logical Volumes LogVol01 (30GB) & LogVol02 (30GB) in new VolGroup VolGroup01.
3. Make two volumes of 30 GB each.
4. Format the new volumes.
5. Mount them on /u02 (30GB) and /u03 (30GB).
6. FSTAB entires.

[root@wolfdev03 ~]# fdisk -l

Disk /dev/sda: 73.4 GB, 73406611456 bytes
255 heads, 63 sectors/track, 8924 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 8924 71577607+ 8e Linux LVM

Disk /dev/sdb: 73.4 GB, 73406611456 bytes
128 heads, 32 sectors/track, 35003 cylinders
Units = cylinders of 4096 * 512 = 2097152 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 35003 71686143+ 8e Linux LVM
-------------------------------------------------------------------

[root@wolfdev03 ~]# pvscan
PV /dev/sda2 VG VolGroup00 lvm2 [68.25 GB / 32.00 MB free]
PV /dev/sdb1 VG VolGroup00 lvm2 [68.34 GB / 68.34 GB free]
Total: 2 [136.59 GB] / in use: 2 [136.59 GB] / in no VG: 0 [0 ]
-------------------------------------------------------------------

[root@wolfdev03 ~]# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [58.22 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [10.00 GB] inherit



Thanks,

Gulam.

[Steven E. Protter]

Shalom Gulam,

after pvcreate

Either

vgcreate a new volume group.
vgcreate -n newvg /dev/sdb1
lvcreate -L 30 GB newvg
mkfs.ext3
mount

You got a filesystem to use.

SEP

[Gulam Mohiuddin]

I get the following error:

[root@wolfdev03 ~]# vgcreate VolGroup01 /dev/sdb1
Physical volume '/dev/sdb1' is already in volume group 'VolGroup00'
Unable to add physical volume '/dev/sdb1' to volume group 'VolGroup01'


Thanks,

Gulam.

[Ivan Ferreira · Accepted solution]

As pvscan reports, sdb is already in a volume group, so:

1. Create new Volume Group VolGroup01 using (/dev/sdb1).

Not possible/needed, sdb already in a volume group.

2. Create new Logical Volumes LogVol01 (30GB) & LogVol02 (30GB) in new VolGroup VolGroup01.
3. Make two volumes of 30 GB each.

LogVol01 already exists, use a new logical volume name. Let's say, LogVol02 and LogVol03.
lvcreate -n LogVol02 -L 30GB VolGroup00
lvcreate -n LogVol03 -L 30GB VolGroup00

4. Format the new volumes.

mkfs -t ext3 /dev/VolGroup00/LogVol02
mkfs -t ext3 /dev/VolGroup00/LogVol03
tune2fs -i 0 -c 0 -m 0 /dev/VolGroup00/LogVol02

tune2fs -i 0 -c 0 -m 0 /dev/VolGroup00/LogVol03

5. Mount them on /u02 (30GB) and /u03 (30GB).

mkdir /u02
mount /dev/VolGroup00/LogVol02 /u02
mkdir /u03
mount /dev/VolGroup00/LogVol03 /u03

6. FSTAB entires.

Copy/paste another fstab entry and correct the device and mount point fields.

[Hemmetter]

Hi Gulam

if you want to create VolGroup01 with /dev/sdb1 first you have to
$ vgreduce VolGroup00 /dev/sdb1
then
$ vgcreate VolGroup01 /dev/sdb1


rgds
HGH

[Gulam Mohiuddin]

Do I need to take VolGroup00 offline in order to reduce it or extend it?

Thanks,

Gulam.

[Hemmetter]

Hi Gulam,

no you do not need to take volumegroup offline neither for reducing nor for extending.

Just make sure no LE of /dev/sdb1 is used:
PV /dev/sdb1 VG VolGroup00 lvm2 [68.34 GB / 68.34 GB free]
looks good for me.

rgds
HGH

[Gulam Mohiuddin]

Thanks everybody for your prompt help.

This job is done.

Thanks,

Gulam.