Difference between revisions of "User:Menno/Installing Arch Linux with EVMS"

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(Storage plan - removed an unnecessary adjective from my last edit.)
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[[Category:Getting and installing Arch (English)]]
+
[[Category:Getting and installing Arch]]
[[Category:File systems (English)]]
+
[[Category:File systems]]
  
 
This HOWTO describes how to install Arch Linux with all filesytems (including the root-filesystem) managed by [[Wikipedia:Enterprise Volume Management System|Enterprise Volume Management System]] (EVMS).
 
This HOWTO describes how to install Arch Linux with all filesytems (including the root-filesystem) managed by [[Wikipedia:Enterprise Volume Management System|Enterprise Volume Management System]] (EVMS).
Line 16: Line 16:
 
It's not my intention to explain all ins and outs of EVMS, readers unfamiliar with EVMS should read the [http://evms.sourceforge.net/user_guide/ EVMS User Guide].  
 
It's not my intention to explain all ins and outs of EVMS, readers unfamiliar with EVMS should read the [http://evms.sourceforge.net/user_guide/ EVMS User Guide].  
  
I've tested EVMS on Arch Linux in a virtual machine ([[VirtualBox]]). I'm relative new to Arch Linux, but I've used EVMS for about 2 years on Gentoo.
+
I've tested EVMS on Arch Linux in a virtual machine ([[VirtualBox]]). I'm relatively new to Arch Linux, but I've used EVMS for about 2 years on Gentoo.
  
 
== Storage plan ==
 
== Storage plan ==
An important part of setting up a system with EVMS is making a plan that describes how the harddisk space will be used, where you use RAID or LVM and so on. Because the install CD does not support EVMS, you need a partition of a minimum of 500MB for the initial installation. After the installation this partition is available for normal use, for example as Swap-space. Another solution is to use a portal medium (e.g. a flash drive) with Arch installed already, and perform these operations on a mounted hard drive within the target system. This method will not be covered in the procedure below.
+
An important part of setting up a system with EVMS is making a plan that describes how the harddisk space will be used, where you use RAID or LVM and so on. Because the install CD does not support EVMS, you need a partition of a minimum of 500MB for the initial installation. After the installation this partition is available for normal use, for example as Swap-space. Another solution is to use a portable medium (e.g. a flash drive) with Arch installed already, and perform these operations on a mounted hard drive within the target system; however, this method will not be covered in the procedure below.
  
 
In this HOWTO I will use an example setup with 2 disks, 4GB and 2GB. I'll create 5 volumes:
 
In this HOWTO I will use an example setup with 2 disks, 4GB and 2GB. I'll create 5 volumes:
Line 26: Line 26:
 
[[Image:Storage-plan-evms.png]]
 
[[Image:Storage-plan-evms.png]]
  
You'll need at least one "Compatibility volume" with enough space for a minimal Arch Linux install, 500MB should be enough.
+
You'll need at least one "Compatibility volume" with enough space for a minimal Arch Linux install; 500MB should be enough.
  
 
== Installing Arch Linux on the temporary partition ==
 
== Installing Arch Linux on the temporary partition ==
 
Install Arch Linux using the [[Official Arch Linux Install Guide]].
 
Install Arch Linux using the [[Official Arch Linux Install Guide]].
* Partition the hard drives in the way you desiged them in the previous step, in this example:
+
* Partition the hard drives to match your design from the previous step; for our example, it is as follows:
 
                               Disk Drive: /dev/sda
 
                               Disk Drive: /dev/sda
 
     Name        Flags      Part Type  FS Type          [Label]        Size (MB)
 
     Name        Flags      Part Type  FS Type          [Label]        Size (MB)
Line 55: Line 55:
 
Glib is needed for '''evmsn''', the Ncurses interface to EVMS
 
Glib is needed for '''evmsn''', the Ncurses interface to EVMS
  
Edit /etc/mkinicpio.conf:
+
Edit {{ic|/etc/mkinicpio.conf}}:
 
  '''-''' HOOKS=“base udev '''autodetect''' pata scsi sata keymap filesystems”
 
  '''-''' HOOKS=“base udev '''autodetect''' pata scsi sata keymap filesystems”
 
  '''+''' HOOKS=“base udev '''evms''' pata scsi sata keymap filesystems”
 
  '''+''' HOOKS=“base udev '''evms''' pata scsi sata keymap filesystems”
Edit /lib/initcpio/install/evms (bug [http://bugs.archlinux.org/task/8895 #8895]):
+
Edit {{ic|/lib/initcpio/install/evms}} ({{bug|8895}}):
 
  '''-''' MODULES="dm_mod md_mod"
 
  '''-''' MODULES="dm_mod md_mod"
 
  '''+''' MODULES=" $(checked_modules "drivers/md/*") "
 
  '''+''' MODULES=" $(checked_modules "drivers/md/*") "
Make a new initial ramdisk environment:
+
Make a new initial RAM disk environment:
  # mkinitcpio -p kernel26
+
  # mkinitcpio -p linux
Add the following to /etc/rc.sysinit, after the LVM block:
+
Add the following to {{ic|/etc/rc.sysinit}}, after the LVM block:
 
  if [ "$USEEVMS" = "yes" -o "$USEEVMS" = "YES" ]; then
 
  if [ "$USEEVMS" = "yes" -o "$USEEVMS" = "YES" ]; then
 
         if [ -x /usr/sbin/evms_activate ]; then
 
         if [ -x /usr/sbin/evms_activate ]; then
Line 76: Line 76:
 
  fi
 
  fi
  
Add this line to /etc/rc.conf:
+
Add this line to {{ic|/etc/rc.conf}}:
 
  USEEVMS="yes"
 
  USEEVMS="yes"
  
Change root-device in /etc/fstab ...
+
Change root-device in {{ic|/etc/fstab}} ...
 
  '''-''' /dev/sda6 / ext3 defaults 0 1
 
  '''-''' /dev/sda6 / ext3 defaults 0 1
 
  '''+''' /dev/evms/sda6 / ext3 defaults 0 1
 
  '''+''' /dev/evms/sda6 / ext3 defaults 0 1
  
... and in /boot/grub/menu.lst
+
... and in {{ic|/boot/grub/menu.lst}}
  '''-''' kernel /boot/vmlinuz26 root=/dev/sda6 ro
+
  '''-''' kernel /boot/vmlinuz-linux root=/dev/sda6 ro
  '''+''' kernel /boot/vmlinuz26 root=/dev/evms/sda6 ro
+
  '''+''' kernel /boot/vmlinuz-linux root=/dev/evms/sda6 ro
  
 
Reboot.
 
Reboot.
Line 345: Line 345:
 
  Actions » Quit
 
  Actions » Quit
  
Edit /etc/evms.conf:
+
Edit {{ic|/etc/evms.conf}}:
 
   lvm2 {
 
   lvm2 {
 
             # Should the LVM2 plugin prompt you for confirmation when it finds
 
             # Should the LVM2 plugin prompt you for confirmation when it finds
Line 362: Line 362:
 
   }
 
   }
  
== Copy the instalation to the right volumes ==
+
== Copy the installation to the right volumes ==
 
Make filesystems on the new volumes:
 
Make filesystems on the new volumes:
 
  # mkfs.ext3 /dev/evms/root
 
  # mkfs.ext3 /dev/evms/root
Line 369: Line 369:
 
  # mkfs.ext3 /dev/evms/var
 
  # mkfs.ext3 /dev/evms/var
  
Mount the volumes under /new:
+
Mount the volumes under {{ic|/new}}:
 
  # mkdir /new
 
  # mkdir /new
 
  # mount /dev/evms/root /new
 
  # mount /dev/evms/root /new
Line 386: Line 386:
 
  # cp -a /dev/console /dev/zero /dev/null /new/dev
 
  # cp -a /dev/console /dev/zero /dev/null /new/dev
  
Edit /new/etc/fstab
+
Edit {{ic|/new/etc/fstab}}
 
  - /dev/evms/sda6 / ext3 defaults 0 1
 
  - /dev/evms/sda6 / ext3 defaults 0 1
 
  + /dev/evms/root / ext3 defaults 0 1
 
  + /dev/evms/root / ext3 defaults 0 1
Line 393: Line 393:
 
  + /dev/evms/var /var ext3 defaults 0 2
 
  + /dev/evms/var /var ext3 defaults 0 2
  
If /boot is on a own volume, make a symlink to itself:
+
If {{ic|/boot}} is on a separate volume, make a symlink to itself:
 
  # cd /new/boot
 
  # cd /new/boot
 
  # ln -s . boot
 
  # ln -s . boot
  
Add an entry to /new/boot/grub/menu.lst:
+
Add an entry to {{ic|/new/boot/grub/menu.lst}}:
 
  # (0) Arch Linux EVMS
 
  # (0) Arch Linux EVMS
 
  title  Arch Linux EVMS
 
  title  Arch Linux EVMS
 
  root  (hd0,0)
 
  root  (hd0,0)
  kernel /boot/vmlinux26 root=/dev/evms/root ro
+
  kernel /boot/vmlinuz-linux root=/dev/evms/root ro quiet
  initrd /boot/kernel26.img
+
  initrd /boot/initramfs-linux.img
  
Reinstall grub on both disks:
+
Reinstall GRUB on both disks:
 
  # grub
 
  # grub
 
  grub> root (hd0,0)
 
  grub> root (hd0,0)
Line 413: Line 413:
 
  grub> quit
 
  grub> quit
  
Find a new life for /dev/evms/sda6
+
Find a new life for {{ic|/dev/evms/sda6}}
  
 
== Links ==
 
== Links ==
* [http://gentoo-wiki.com/HOWTO_setup_evms HOWTO setup evms] at the Gentoo-wiki
 
 
* [http://evms.sourceforge.net/user_guide/ EVMS User Guide]
 
* [http://evms.sourceforge.net/user_guide/ EVMS User Guide]

Revision as of 17:33, 26 September 2012


This HOWTO describes how to install Arch Linux with all filesytems (including the root-filesystem) managed by Enterprise Volume Management System (EVMS).

Disclaimer

Following this guide can destroy your data. Backup all your data first or live with it if something goes wrong.

Introduction

EVMS is a tool that provides easy and unified access to RAID (0,1,4,5,6,10), LVM, expanding and shrinking of volumes and file systems, bad block relocation and more.
EVMS is not supported on the Arch Linux install CDs, so the install requires some extra steps:

  1. Install a minimal Arch Linux system on a normal partition
  2. Install the EVMS package and create EVMS-volumes
  3. Copy all files to the EVMS-volumes

It's not my intention to explain all ins and outs of EVMS, readers unfamiliar with EVMS should read the EVMS User Guide.

I've tested EVMS on Arch Linux in a virtual machine (VirtualBox). I'm relatively new to Arch Linux, but I've used EVMS for about 2 years on Gentoo.

Storage plan

An important part of setting up a system with EVMS is making a plan that describes how the harddisk space will be used, where you use RAID or LVM and so on. Because the install CD does not support EVMS, you need a partition of a minimum of 500MB for the initial installation. After the installation this partition is available for normal use, for example as Swap-space. Another solution is to use a portable medium (e.g. a flash drive) with Arch installed already, and perform these operations on a mounted hard drive within the target system; however, this method will not be covered in the procedure below.

In this HOWTO I will use an example setup with 2 disks, 4GB and 2GB. I'll create 5 volumes: A picture tells more than a thousand words:

File:Storage-plan-evms.png

You'll need at least one "Compatibility volume" with enough space for a minimal Arch Linux install; 500MB should be enough.

Installing Arch Linux on the temporary partition

Install Arch Linux using the Official Arch Linux Install Guide.

  • Partition the hard drives to match your design from the previous step; for our example, it is as follows:
                             Disk Drive: /dev/sda
   Name        Flags      Part Type  FS Type          [Label]        Size (MB)
------------------------------------------------------------------------------
   sda1                    Primary   Linux                               98.71
   sda2                    Primary   Linux                             2048.10
   sda5                    Logical   Linux                             1497.01
   sda6                    Logical   Linux                              649.80
                             Disk Drive: /dev/sdb
   Name        Flags      Part Type  FS Type          [Label]        Size (MB)
------------------------------------------------------------------------------
   sdb1                    Primary   Linux                               98.71
   sdb2                    Primary   Linux                             2048.10
  • Install Arch Linux on the compatibility volume (/dev/sda6 in the example)
  • Do not mount the other partitions
  • The packages for mdadm and LVM are not necessary
  • Answer "No" to all questions about RAID or LVM.

Install EVMS in Arch Linux

Boot your new Arch Linux system and install the EVMS package:

# pacman -S evms glib

Glib is needed for evmsn, the Ncurses interface to EVMS

Edit /etc/mkinicpio.conf:

- HOOKS=“base udev autodetect pata scsi sata keymap filesystems”
+ HOOKS=“base udev evms pata scsi sata keymap filesystems”

Edit /lib/initcpio/install/evms (FS#8895):

- MODULES="dm_mod md_mod"
+ MODULES=" $(checked_modules "drivers/md/*") "

Make a new initial RAM disk environment:

# mkinitcpio -p linux

Add the following to /etc/rc.sysinit, after the LVM block:

if [ "$USEEVMS" = "yes" -o "$USEEVMS" = "YES" ]; then
        if [ -x /usr/sbin/evms_activate ]; then
                stat_busy "Activating EVMS"
                /usr/sbin/evms_activate
                if [ $? -ne 0 ]; then
                        stat_fail
                else
                        stat_done
                fi
        fi
fi

Add this line to /etc/rc.conf:

USEEVMS="yes"

Change root-device in /etc/fstab ...

- /dev/sda6 / ext3 defaults 0 1
+ /dev/evms/sda6 / ext3 defaults 0 1

... and in /boot/grub/menu.lst

- kernel /boot/vmlinuz-linux root=/dev/sda6 ro
+ kernel /boot/vmlinuz-linux root=/dev/evms/sda6 ro

Reboot.

Create EVMS-volumes

Start evmsn:

# evmsn

Remove automagicly created compatibility volumes on partitions you want to use with RAID and/or LVM

Actions » Delete » Volume...
+------------------------ Delete Logical Volume -------------------------+
|                                                                        |
|     Logical Volume                          Size                       |
| ---------------------------------------------------------------------- |
| X   /dev/evms/sda1                       94.1 MB                       |
| X   /dev/evms/sda2                        1.9 GB                       |
| X   /dev/evms/sda5                        1.4 GB                       |
| X   /dev/evms/sdb1                       94.1 MB                       |
| X   /dev/evms/sdb2                        1.9 GB                       |
|                                                                        |
|                                                                        |
| Use the spacebar key to make selections and choose Delete to continue  |
|                                                                        |
| [Help]                          [Cancel] [Recursive Delete] [Delete]   |
|                                                                        |
+------------------------------------------------------------------------+
+------------------------------------------------------------------------+
|Engine: Volume "/dev/evms/sda1" does not have a File System Interface Mo|
|dule (FSIM) assigned to it.  The volume may have a file system on it, bu|
|t none of the installed FSIM plug-ins recognizes it.  Do you want to wri|
|te zeros to the first 1MB of the volume to potentially disable any file |
|system that may be on the volume?                                       |
|                                                                        |
|                          [Write zeros] [Do not write zeros] [Cancel]   |
|                                                                        |
+------------------------------------------------------------------------+
+------------------------------------------------------------------------+
|Engine: Volume "/dev/evms/sda1" is not an EVMS volume.  Removing a non-E|
|VMS volume requires writing 1024 bytes of metadata at the end of the vol|
|ume. The metadata will overwrite any data that may be at the end of the |
|volume.  Do you want to continue with the delete?                       |
|                                                                        |
|                                                  [Continue] [Cancel]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create RAID1 array on sda1 and sdb1
Actions » Create » Region...
+------------------------ Create Storage Region -------------------------+
|                                                                        |
|     Region Manager                                                     |
| ---------------------------------------------------------------------- |
|     MD Linear Raid Region Manager                                      |
| X   MD Raid 1 Region Manager                                           |
|     MD RAID0 Region Manager                                            |
|     MD RAID 4/5 Region Manager                                         |
|     MD Multipath Region Manager                                        |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel]            [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+-------------- Create Storage Region - Acceptable Objects --------------+
|                                                                        |
|     Name                                    Size                       |
| ---------------------------------------------------------------------- |
| X   sda1                                 94.1 MB                       |
|     sda2                                  1.9 GB                       |
|     sda5                                  1.4 GB                       |
| X   sdb1                                 94.1 MB                       |
|     sdb2                                  1.9 GB                       |
|                                                                        |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel] [Previous] [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+------------ Create Storage Region - Configuration Options -------------+
|                                                                        |
| Option                  Value                                          |
| ---------------------------------------------------------------------- |
| Version 1 Super Block   No                                             |
| Degraded array          No                                             |
| Spare Disk              None                                           |
|                                                                        |
|  Use spacebar to select an option to change. Select Create to finish.  |
|                                                                        |
| [Help]                                  [Cancel] [Previous] [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create RAID1 array on sda2 and sdb2
    • repeat the previous step
  • Create LVM container 'main' on md/md1 and sda5
Actions » Create » container...
+----------------------- Create Storage Container -----------------------+
|                                                                        |
|     Plug-in                                                            |
| ---------------------------------------------------------------------- |
|     LVM Region Manager                                                 |
| X   LVM2 Region Manager                                                |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel]            [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+------------ Create Storage Container - Acceptable Objects -------------+
|                                                                        |
|     Name                                    Size                       |
| ---------------------------------------------------------------------- |
| X   sda5                                  1.4 GB                       |
|     md/md0                               94.0 MB                       |
| X   md/md1                                1.9 GB                       |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel] [Previous] [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+----------- Create Storage Container - Configuration Options -----------+
|                                                                        |
| Option                                    Value                        |
| ---------------------------------------------------------------------- |
| Name for the new LVM2 container.          main                         |
| Extent-size for the new LVM2 container.   32.0 MB                      |
|                                                                        |
|  Use spacebar to select an option to change. Select Create to finish.  |
|                                                                        |
| [Help]                                  [Cancel] [Previous] [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create LVM region 'root' on 'lvm2/main/Freespace', mapping to object md/md1
Actions » Create » Region...
+------------------------ Create Storage Region -------------------------+
|                                                                        |
|     Region Manager                                                     |
| ---------------------------------------------------------------------- |
| X   LVM2 Region Manager                                                |
|     MD Linear Raid Region Manager                                      |
|     MD Raid 1 Region Manager                                           |
|     MD RAID0 Region Manager                                            |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel]            [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+-------------- Create Storage Region - Acceptable Objects --------------+
|                                                                        |
|     Name                                    Size                       |
| ---------------------------------------------------------------------- |
| X   lvm2/main/Freespace                   3.3 GB                       |
|                                                                        |
|  Use the spacebar key to make selections and choose Next to continue   |
|                                                                        |
| [Help]                                    [Cancel] [Previous] [Next]   |
|                                                                        |
+------------------------------------------------------------------------+
+------------ Create Storage Region - Configuration Options -------------+
|                                                                        |
| Option                                           Value                 |
| ---------------------------------------------------------------------- |
| Name for the new LVM2 region.                    root                  |
| Size for the new LVM2 region.                    1.0 GB                |
| Number of stripes for the new LVM2 region.       1                     |
| Objects (PVs) to place the new LVM2 region on.   md/md1                |
|                                                                        |
|  Use spacebar to select an option to change. Select Create to finish.  |
|                                                                        |
| [Help]                                  [Cancel] [Previous] [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create LVM region 'home' on 'lvm2/main/Freespace', mapping to object md/md1
    • Only the last step is different. If you choose Object 'md/md1' the size is automaticly adjusted.
+------------ Create Storage Region - Configuration Options -------------+
|                                                                        |
| Option                                           Value                 |
| ---------------------------------------------------------------------- |
| Name for the new LVM2 region.                    home                  |
| Size for the new LVM2 region.                    928.0 MB                |
| Number of stripes for the new LVM2 region.       1                     |
| Objects (PVs) to place the new LVM2 region on.   md/md1                |
|                                                                        |
|  Use spacebar to select an option to change. Select Create to finish.  |
|                                                                        |
| [Help]                                  [Cancel] [Previous] [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create LVM region 'var' on 'lvm2/main/Freespace'
    • Choosing an object is not necessary
+------------ Create Storage Region - Configuration Options -------------+
|                                                                        |
| Option                                           Value                 |
| ---------------------------------------------------------------------- |
| Name for the new LVM2 region.                    var                  |
| Size for the new LVM2 region.                    1.4 GB                |
| Number of stripes for the new LVM2 region.       1                     |
| Objects (PVs) to place the new LVM2 region on.                         |
|                                                                        |
|  Use spacebar to select an option to change. Select Create to finish.  |
|                                                                        |
| [Help]                                  [Cancel] [Previous] [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • Create EVMS-volumes on md/md0, lvm2/main/root, lvm2/main/home and lvm2/main/var
Actions » Create » EVMS Volume...
+-------------------------- Create EVMS Volume --------------------------+
|                                                                        |
|     Storage Object                          Size                       |
| ---------------------------------------------------------------------- |
|     lvm2/main/home                      928.0 MB                       |
|     lvm2/main/root                        1.0 GB                       |
|     lvm2/main/var                         1.4 GB                       |
| X   md/md0                               94.0 MB                       |
|                                                                        |
| Use the spacebar key to make selections and choose Create to continue  |
|                                                                        |
| [Help]                                  [Cancel]            [Create]   |
|                                                                        |
+------------------------------------------------------------------------+
  • This is the new situation:
Actions   Settings                                                        Help
0=Logical Volumes

Name                          Size Modified Active R/O  Plug-in   Mountpoint
------------------------------------------------------------------------------
/dev/evms/boot             94.0 MB    X
/dev/evms/home            928.0 MB    X
/dev/evms/root           1024.0 MB    X
/dev/evms/sda6            619.7 MB             X        Ext2/3    /
/dev/evms/var               1.4 GB    X
  • Save
Actions » Save...
  • Quit
Actions » Quit

Edit /etc/evms.conf:

  lvm2 {
            # Should the LVM2 plugin prompt you for confirmation when it finds
            # LVM2 metadata on an object, but the object does not pass the
            # necessary size checks? If yes, it will ask you if the object is
            # really an LVM2 PV. If no, it will assume the object is not a PV.
            #
            # If you have used EVMS to create an LVM2 container on top of an
            # MD Software-RAID region, you'll most likely want to set this
            # parameter to no.
            #
            # The default is yes.

-           device_size_prompt = yes
+           device_size_prompt = no
  }

Copy the installation to the right volumes

Make filesystems on the new volumes:

# mkfs.ext3 /dev/evms/root
# mkfs.ext3 /dev/evms/boot
# mkfs.ext3 /dev/evms/home
# mkfs.ext3 /dev/evms/var

Mount the volumes under /new:

# mkdir /new
# mount /dev/evms/root /new
# mkdir /new/boot /new/home /new/var
# mount /dev/evms/boot /new/boot
# mount /dev/evms/home /new/home
# mount /dev/evms/var /new/var

Go to single-user mode:

# telinit 1

Copy the system to the new volumes:

# cd /
# ls | grep -vE "dev|proc|sys|new" | xargs cp -a -t /new
# mkdir /new/dev /new/proc /new/sys
# cp -a /dev/console /dev/zero /dev/null /new/dev

Edit /new/etc/fstab

- /dev/evms/sda6 / ext3 defaults 0 1
+ /dev/evms/root / ext3 defaults 0 1
+ /dev/evms/boot /boot ext3 defaults,noauto 0 2
+ /dev/evms/home /home ext3 defaults 0 2
+ /dev/evms/var /var ext3 defaults 0 2

If /boot is on a separate volume, make a symlink to itself:

# cd /new/boot
# ln -s . boot

Add an entry to /new/boot/grub/menu.lst:

# (0) Arch Linux EVMS
title  Arch Linux EVMS
root   (hd0,0)
kernel /boot/vmlinuz-linux root=/dev/evms/root ro quiet
initrd /boot/initramfs-linux.img

Reinstall GRUB on both disks:

# grub
grub> root (hd0,0)
grub> setup (hd0)
grub> device (hd0) /dev/sdb
grub> root (hd0,0)
grub> setup (hd0)
grub> quit

Find a new life for /dev/evms/sda6

Links