Manual Suse openSUSE 12.2 (page 104 of 530) (English)

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• With LVM, it is possible to add hard disks or LVs in a running system. However,

this requires hot-swappable hardware.

• It is possible to activate a "striping mode" that distributes the data stream of a LV

over several PVs. If these PVs reside on different disks, the read and write perfor-

mance is enhanced, as with RAID 0.

• The snapshot feature enables consistent backups (especially for servers) of the running

system.

With these features, LVM is ready for heavily used home PCs or small servers. LVM

is well-suited for the user with a growing data stock (as in the case of databases, music

archives, or user directories). This would allow le systems that are larger than the

physical hard disk. Another advantage of LVM is that up to 256 LVs can be added.

However, working with LVM is different from working with conventional partitions.

Instructions and further information about conguring LVM is available in the ofcial

LVM HOWTO at http://tldp.org/HOWTO/LVM-HOWTO/.

Starting from Kernel version 2.6, LVM version 2 is available, which is backward-

compatible with the previous LVM and enables the continued management of old volume

groups. When creating new volume groups, decide whether to use the new format or

the backward-compatible version. LVM 2 does not require any kernel patches. It makes

use of the device mapper integrated in kernel 2.6. This kernel only supports LVM ver-

sion 2. Therefore, when talking about LVM, this section always refers to LVM version 2.

3.2.2 LVM Conguration with YaST

The YaST LVM conguration can be reached from the YaST Expert Partitioner (see

Section 3.1, “Using the YaST Partitioner” (page 73)) within the Volume Management

item in the System View pane. The Expert Partitioner allows you to edit and delete ex-

isting partitions and also create new ones that need to be used with LVM. The rst task

is to create PVs that provide space to a volume group:

Select a hard disk from Hard Disks.

Change to the Partitions tab.

Click Add and enter the desired size of the PV on this disk.

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Suse openSUSE 12.2 Manual

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