Upgrade Microsoft Hyper-V Linux IC from 3.3 to 3.4

Recently I had to upgrade the integration components on a lot of CentOS virtual systems running on a Hyper-V failover cluster. During the upgrade procedure I faced a couple of things, which I'd like you to be aware of. The version on the guest VM is CentOS 6.3, the Hyper-V failover cluster is running under Windows Server 2008 R2 SP1 and consists of 6 nodes.

Below is the output of LVM related commands before starting the upgrade of Linux IC:

[root@CentOS ~]# pvs
  PV         VG     Fmt  Attr PSize PFree
  /dev/sda2  system lvm2 a--  9.50g 4.25g

[root@CentOS ~]# vgs

  VG     #PV #LV #SN Attr   VSize VFree

  system   1   7   0 wz--n- 9.50g 4.25g

[root@CentOS ~]# lvs

  LV   VG     Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert

  home system -wi-ao-- 256.00m

  opt  system -wi-ao-- 256.00m

  root system -wi-ao--   1.00g

  swap system -wi-ao--   1.00g

  tmp  system -wi-ao-- 256.00m

  usr  system -wi-ao--   2.00g

  var  system -wi-ao-- 512.00m

First of all I removed the old kernel packages, because the installation scripts provided by Hyper-V Linux IC packages re-build the initrd for each kernel they found in the system. The removing of old kernels saves time.

[root@CentOS ~]# rpm -q kernel

kernel-2.6.32-279.2.1.el6.x86_64

kernel-2.6.32-279.5.1.el6.x86_64

kernel-2.6.32-279.5.2.el6.x86_64

kernel-2.6.32-279.9.1.el6.x86_64

kernel-2.6.32-279.11.1.el6.x86_64

I had to find out the version of the running kernel, because its package cannot be removed:
[root@CentOS ~]# uname -a

Linux CentOS 2.6.32-279.11.1.el6.x86_64 #1 SMP Tue Oct 16 15:57:10 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Then removed the old kernel packages:
[root@CentOS ~]# yum remove kernel-2.6.32-279.2.1.el6.x86_64 kernel-2.6.32-279.5.1.el6.x86_64 kernel-2.6.32-279.5.2.el6.x86_64 kernel-2.6.32-279.9.1.el6.x86_64

At this point there was only one kernel package installed:
[root@CentOS ~]# rpm -q kernel

kernel-2.6.32-279.11.1.el6.x86_64

So let's upgrade the Linux Integration Components to the new version:

[root@CentOS ~]# mount -o loop /tmp/LinuxICv34.iso /mnt
[root@CentOS ~]# cd /mnt/RHEL63/

[root@CentOS RHEL63]# ./upgrade.sh

Upgrading the Linux Integration Services for Microsoft Hyper-V...

Preparing...                ########################################### [100%]

   1:kmod-microsoft-hyper-v ########################################### [ 50%]

   2:microsoft-hyper-v      ########################################### [100%]

Saving old initramfs

Installing new initramfs

 Linux Integration Services for Hyper-V has been Upgraded. Please reboot your system

After reboot:

[root@CentOS ~]# rpm -qa | grep hyper-v

microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64

kmod-microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64

But somehow the hdd driver found disks and partitions twice:

[root@CentOS ~]# pvs

  Found duplicate PV T6aUTmcAaWK29Sa3EQTZeztnNqYJu5Kv: using /dev/sdb2 not /dev/sda2

  PV         VG     Fmt  Attr PSize PFree

  /dev/sdb2  system lvm2 a--  9.50g 4.25g

[root@CentOS ~]# vgs

  Found duplicate PV T6aUTmcAaWK29Sa3EQTZeztnNqYJu5Kv: using /dev/sdb2 not /dev/sda2

  VG     #PV #LV #SN Attr   VSize VFree

  system   1   7   0 wz--n- 9.50g 4.25g

[root@CentOS ~]# lvs

  Found duplicate PV T6aUTmcAaWK29Sa3EQTZeztnNqYJu5Kv: using /dev/sdb2 not /dev/sda2

  LV   VG     Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert

  home system -wi-ao-- 256.00m

  opt  system -wi-ao-- 256.00m

  root system -wi-ao--   1.00g

  swap system -wi-ao--   1.00g

  tmp  system -wi-ao-- 256.00m

  usr  system -wi-ao--   2.00g

  var  system -wi-ao-- 512.00m

The CentOS VM ran without any obvious problems, but I wanted to get rid of the issue. The solution was to re-install the packages.

The first step is to remove Linux IC packages, because the script form the Linux IC installation ISO didn't permit the re-installation or the upgrade, when it found the installed packages:

[root@CentOS ~]# mount -o loop /tmp/LinuxICv34.iso /mnt                           

[root@CentOS ~]# cd /mnt/RHEL63/

[root@CentOS RHEL63]# ./install.sh

Installing the Linux Integration Services for Microsoft Hyper-V...

Preparing...                ########################################### [100%]

        package kmod-microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64 is already installed

Kmod RPM installation failed, Exiting.

[root@CentOS RHEL63]# ./upgrade.sh

Upgrading the Linux Integration Services for Microsoft Hyper-V...

Preparing...                ########################################### [100%]

        package kmod-microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64 is already installed

        package microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64 is already installed

Microsoft-Hyper-V rpm Upgradation failed, Exiting

[root@CentOS RHEL63]# yum -yq remove microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64 kmod-microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64

================================================================================

 Package                  Arch     Version                    Repository   Size

================================================================================

Removing:

 kmod-microsoft-hyper-v   x86_64   rhel63.3.4-1.20120727      installed   4.3 M

 microsoft-hyper-v        x86_64   rhel63.3.4-1.20120727      installed    16 k

Transaction Summary

================================================================================

Remove        2 Package(s)

Create and install initramfs without Hyper-V drivers

Linux Integration Services for Hyper-V has been removed.  Please reboot your system.

After the removing of packages I started the install procedure:

[root@CentOS RHEL63]# ./install.sh                                              
Installing the Linux Integration Services for Microsoft Hyper-V...

Preparing...                ########################################### [100%]

   1:kmod-microsoft-hyper-v ########################################### [100%]

Preparing...                ########################################### [100%]

   1:microsoft-hyper-v      ########################################### [100%]

Saving old initramfs

Installing new initramfs

 Linux Integration Services for Hyper-V has been installed. Please reboot your system.

and re-started the VM after that:

[root@CentOS RHEL63]# reboot

After the re-installation of the packages with a reboot the disks and partitions were detected the correct way: 

[root@CentOS ~]# pvs

  PV         VG     Fmt  Attr PSize PFree

  /dev/sda2  system lvm2 a--  9.50g 4.25g

[root@CentOS ~]# vgs

  VG     #PV #LV #SN Attr   VSize VFree

  system   1   7   0 wz--n- 9.50g 4.25g

[root@CentOS ~]# lvs

  LV   VG     Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert

  home system -wi-ao-- 256.00m

  opt  system -wi-ao-- 256.00m

  root system -wi-ao--   1.00g

  swap system -wi-ao--   1.00g

  tmp  system -wi-ao-- 256.00m

  usr  system -wi-ao--   2.00g

  var  system -wi-ao-- 512.00m

[root@CentOS ~]# rpm -q kernel

kernel-2.6.32-279.11.1.el6.x86_64

[root@CentOS ~]# rpm -qa | grep hyper-v                                           

kmod-microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64

microsoft-hyper-v-rhel63.3.4-1.20120727.x86_64