Red Hat LVM ADMINISTRATOR 5.0 Manual de usuario descargar pdf (Pagina 6)

STORAGE ENVIRONMENT

POWER SOLUTIONS November 2003

116

Scenario C: Adding more storage

If a Dell PowerEdge server lacks un-

allocated or unused storage space,

administrators must add more storage

to expand volumes. This approach

requires adding more hard drives or

a Dell disk enclosure such as a

PowerVault 220S. For background on

expanding storage for PowerEdge

servers, see “Expanding Storage on

Linux-based Servers” by Matt

Domsch and Tesfamariam Michael in

Dell Power Solutions, February 2003

(http://www.dell.com/us/en/esg/

topics/power_ps1q03-michael.htm).

The article is particularly helpful

because the expansion procedure can be very complex, especially

for RAID storage, the recommended type. To expand a volume by

adding more storage, administrators can follow these steps:

1. Partition the added drive or RAID volume and set its

partition ID to 8e:

fdisk /dev/new_added_drive

For this scenario, to add the drive /dev/sdc, enter:

fdisk /dev/sdc

2. Create a physical volume on the new partition:

pvcreate /dev/partition_of_new_added_drive

For this scenario, enter:

pvcreate /dev/sdc1

3. Take the logical volume to be expanded offline:

umount /logical_volume_mounting_point

For this scenario, enter:

umount /home

4. Expand the volume group:

vgextend volume_group_name physical_volume_name

For this scenario, enter:

vgextend lvm00 /dev/sdc1

5. Expand the size of the logical volume and its file system:

e2fsadm –L +X logical_volume_name

where X is the expansion size.

For this scenario, to expand /home by 10 GB, enter:

e2fsadm -L +10G /dev/lvm00/home

Alternatively, use the lvextend and resize2fs commands

instead of

e2fsadm. In this case, enter:

lvextend -L +10G lvm00

resize2fs /dev/lvm00/home 10G

6. Mount the expanded logical volume:

mount /logical_volume_mounting_point

For this scenario, enter:

mount -a

7. Bring the system back to the desired runlevel (3 or 5):

init desired_runlevel

8. Verify the changes:

df –h

Achieving more manageable storage environments

LVM eases storage management in Linux installations by empow-

ering Linux system administrators to expand and reduce storage at

an abstracted level. Using the techniques described in this article,

administrators can upgrade, reallocate, and modify storage resources

as needed, helping to create a nimble, scalable storage environment

with minimal complexity.

Tesfamariam Michael ([email protected]) is a software engineer on the

Linux Development Team of the Dell Product Group, which tests Linux on all Dell PowerEdge

servers. Tesfamariam has an M.S. in Computer Science from Clark Atlanta University, a B.S.

in Electrical Engineering from the Georgia Institute of Technology, and a B.S. in Mathemat-

ics from Clark Atlanta University. His areas of interest include operating systems and I/O devices.

Joshua Giles ([email protected]) is a Linux systems management software engi-

neer on the Linux Development Team of the Dell Product Group. His interests include oper-

ating systems, grammar- and automata-based programming, and Support Vector Machine

(SVM) learning. Joshua has a B.S. from the New Mexico Institute of Mining and Technology.

FOR MORE INFORMATION

Dell and Linux: http://www.dell.com/linux

LVM HowTo page: http://tldp.org/HOWTO/LVM-HOWTO

Red Hat Linux: http://www.redhat.com

Sistina LVM: http://www.sistina.com/products_lvm.htm

LVM eases storage

management in Linux

installations by

empowering Linux

system administrators

to expand and

reduce storage at an

abstracted level.

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