Public bug reported:
Binary package hint: ubuntu-docs
I propose the following rewrite for the LVM section of ubuntu server
guide
that is to say from current 2592 to current 2617
<!-- beginning of rewrite -->
2592
Continuing with <emphasis>srv</emphasis> as an LVM volume example, this section
covers adding a second hard disk, creating a Physical Volume (PV), adding it to
the volume group (VG), extending the logical volume <filename
role="directory">srv</filename> and finally extending the filesystem. This
example assumes a second hard disk has been added to the system. This hard disk
will be named /dev/sdb in our example. BEWARE: make sure you don't already have
an existing /dev/sdb before issuing the commands below. You could lose some
data if you issue those commands on a non-empty disk. In our example we will
use the entire disk as a physical volume (you could choose to create partitions
and use them as different physical volumes)
2593
First, create the physical volume, write:
2594
sudo pvcreate /dev/sdb
2595
Now extend the Volume Group (VG):
2596
sudo vgextend vg01 /dev/sdb
2597
Use <emphasis>vgdisplay</emphasis> to find out the free physical extents - Free
PE / size (the size you can allocate). We will assume a free size of 511 PE
(equivalent to 2GB with a PE size of 4MB) and we will use the whole free space
available. Use your own PE and/or free space.
2598
The Logical Volume (LV) can now be extended by different methods, we will only
see how to use the PE to extend the LV:
2599
sudo lvextend /dev/vg01/srv -l +511
2600
The <emphasis>-l</emphasis> option allows the LV to be extended using PE.
The <emphasis>-L</emphasis> option allows the LV to be extended using Meg, Gig,
Tera, etc bytes.
2601
Even though you are supposed to be able to <emphasis>expand</emphasis> an ext3
or ext4 filesystem without unmounting it first, it may be a good pratice to
unmount it anyway and check the filesystem, so that you don't mess up the day
you want to reduce a logical volume (in that case unmounting first is
compulsory).
2602
The following commands are for an <application>EXT3</application> or
<application>EXT4</application> filesystem. If you are using another filesystem
there may be other utilities available.
2603
sudo umount /srv
2604
sudo e2fsck -f /dev/vg01/srv
2605
The <emphasis>-f</emphasis> option of e2fsck force checking even if the system
seems clean.
2606
Finally, resize the filesystem:
2607
sudo resize2fs /dev/vg01/srv
2608
mount the partition and check its size.
2609
mount /dev/vg01/srv /srv && df -h /srv
<!-- end of rewrite -->
** Affects: ubuntu-docs (Ubuntu)
Importance: Undecided
Status: New
--
ubuntu server guide LVM section rewrite
https://bugs.launchpad.net/bugs/347201
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