Differences between version 16 and predecessor to the previous major change of LVMNotes.
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| Newer page: | version 16 | Last edited on Wednesday, June 14, 2006 3:26:10 pm | by CraigBox | Revert |
| Older page: | version 11 | Last edited on Tuesday, May 24, 2005 11:49:45 am | by CraigBox | Revert |
@@ -10,9 +10,18 @@
At install time, create a small (<100mb) /boot, swap, and a reasonable (4-6gb) / partition. Leave the rest of the space unpartitioned.
Make sure LVM is compiled into your kernel, and you have the LVM tools installed. Debian 3 (woody): install lvm10. Debian Sarge/Sid: install lvm2.
-Gentoo has lvm (1.01) and lvm2.
+Gentoo has lvm (1.01) and lvm2. You may also need the device-mapper patch for 2.4.x kernels, available at ftp://sources.redhat.com/pub/dm/. From the LVM2 README.Debian:
+
+ LVM2 requires the device-mapper kernel module (dm-mod). This is
+ available as a kernel patch for 2.4 (included as standard in
+ current Debian 2.4 kernels), and is distributed with linux 2.5 and above.
+
+Apply the patch with something like
+
+ # patch -p1 /path/device-mapper.1.01.03/patches/linux-2.4.28-pre4-devmapper-ioctl.patch
+
!Create a PV[1] partition on your drive
# fdisk /dev/sda
@@ -24,15 +33,15 @@
First, run vgscan:
# vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
- vgscan -- WARNING: This program does not do a VGDA backup of your volume group[4]
+ vgscan -- WARNING: This program does not do a VGDA backup of your volume group [4]
This creates a volume group descriptor area (VGDA) at the start of the disks.
# pvcreate /dev/sda4
pvcreate -- physical volume "/dev/sda4" successfully created
-!Create a volume group (VG)[2]
+!Create a volume group (VG) [2]
This volume group can contain multiple discs, but in this case it only uses one.
# vgcreate lvmarray /dev/sda4
@@ -75,8 +84,12 @@
mount /dev/lvmarray/home /home
You will of course want to move everything from /home first, and add them to fstab(5) etc... To move your partitions, you'll probably want to be in runlevel 1.
+
+If you get an this error message with the above command:
+ mount: special device /dev/lvmarray/home does not exist
+then you may need to use "vgchange -ay" to activate the logical volumes. This can happen if you are booting to a LiveCD or have rebooted after creating the logical volumes.
!!Resizing logical volumes
Oops! Just created 20g /home, 5gb /var and 860mb /usr. So lets take 4gb from home and add it to usr.
@@ -115,5 +128,5 @@
[1] __PV__: Physical Volume; a disc or a partition on a disc.
[2] __VG__: Volume Group; a group of one-or-more physical volumes across which you get a "virtual disk", a space to create logical volumes in.
[3] __LV__: Logical Volume; something you eventually create an FS on.
-[4] To create a __VGDA__ (Volume Group Descriptor Area) Backup
use !vgcfgbackup(8) regularly
+[4] To create a __VGDA__ (Volume Group Descriptor Area) backup,
use !vgcfgbackup(8).
