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and 512 MB. However, the installer limits this range to between

1 MB and 64 MB.

Managing and maintaining system storage

Once LVM is implemented during installation, managing and main-

taining system storage is the next task. If any logical volumes in

the system become full, more space can be added by extending the

logical volume using several methods, including:

•

Add more space from the free unallocated space in the same

volume group (see Scenario A in this article)

•

Reduce another logical volume (see Scenario B)

•

Add more hard drives or Dell PowerVault disk enclosures to

the system (see Scenario C)

In the following scenarios that detail these approaches, /home

is the logical volume to be expanded. Although LVM does not

require these safety measures, administrators should perform a

full system backup and bring the system to runlevel 1 (init 1)

before starting the expansion; in some approaches, the logical

volume being modified should be taken offline. Dell also

recommends performing these operations during off-peak hours.

For more information about the LVM commands used in these

scenarios, see “LVM commands for managing and maintaining

system storage” in this article.

Scenario A: Expanding from unallocated space

in the same volume group

The “Make LVM Volume Group” window in Figure 4 shows that

the volume group lvm00 still has 40 GB of active, unallocated space

that can be used to expand any of the logical volumes. The

following steps describe how to expand the logical volume /home

by 10 GB from this unallocated space:

1. Confirm that the desired logical volume is not being used

and take it offline:

umount /logical_volume_mounting_point

For this scenario, enter:

umount /home

2. To scan for physical and then logical volumes, display all

existing physical volumes with information about the physical

device (such as /dev/sda3) to volume group mappings, the

volume group to which the device belongs, and the present

size status of the device:

pvscan

lvscan

3. To determine the unallocated free space that can be used to

expand the logical volumes, display all volume groups and

their size allocation status:

vgdisplay

4. Expand the logical volume from an active but unallocated

physical volume:

lvextend -L +X /dev/lvm_name/logical_volume_name

/dev/physical_volume

where X is the expansion size. The results from steps 2 and 3

provide the available size for this expansion. The

-L parameter

extends the logical volume size. In this scenario, the unallocated

physical volume is /dev/sda3. Expand the logical volume /home

by 10 GB by entering:

lvextend -L +10G /dev/lvm00/home /dev/sda3

5. Verify that the logical volume was extended by comparing

the current size to that found in step 2:

pvscan

lvscan

These commands should report the updated space information.

6. Resize the file system:

e2fsck -f /dev/logical_volume_name

resize2fs /dev/lvm_name/logical_volume_name

For this scenario, enter:

e2fsck -f /dev/lvm00/home

resize2fs /dev/lvm00/home

STORAGE ENVIRONMENT

POWER SOLUTIONS November 2003

114

Figure 4. Make LVM Volume Group window in Red Hat Linux installer

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