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Suse openSUSE 12.2 Manual

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already exists on your system, it is automatically activated upon entering the initial
LVM conguration of a session. In this case, all disks containing a partition (belonging
to an activated volume group) cannot be repartitioned. The Linux kernel cannot reread
the modied partition table of a hard disk when any partition on this disk is in use. If
you already have a working LVM conguration on your system, physical repartitioning
should not be necessary. Instead, change the conguration of the logical volumes.
At the beginning of the physical volumes (PVs), information about the volume is written
to the partition. To reuse such a partition for other non-LVM purposes, it is advisable
to delete the beginning of this volume. For example, in the VG system and PV /dev/
sda2, do this with the command dd if=/dev/zero of=/dev/sda2 bs=512
count=1.
WARNING: File System for Booting
The le system used for booting (the root le system or /boot) must not be
stored on an LVM logical volume. Instead, store it on a normal physical partition.
3.2 LVM Conguration
This section briey describes the principles behind the Logical Volume Manager (LVM)
and its multipurpose features. In Section 3.2.2, “LVM Conguration with
YaST” (page 86), learn how to set up LVM with YaST.
WARNING
Using LVM is sometimes associated with increased risk such as data loss. Risks
also include application crashes, power failures, and faulty commands. Save
your data before implementing LVM or reconguring volumes. Never work
without a backup.
3.2.1 The Logical Volume Manager
The LVM enables exible distribution of hard disk space over several le systems. It
was developed because sometimes the need to change the segmenting of hard disk space
arises just after the initial partitioning has been done. Because it is difcult to modify
84 Reference
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