0

I setup my kvm virtualization environment with GlusterFS, the topology as follows:

KVM1 ---------- KVM2 --------------KVM3

|----------------------|-------------------------|

-----------------------|-------------------------

--------------|------------------|----------------

-------GlusterFS1---GlusterFS2----------

the description of setup as follows:

Mount GlusterFS

three kvm machines mount glusterfs with command:

/sbin/mount -t glusterfs -o sync,direct-io-mode=enable gfs1.dalegames.com:/gfs /gfs

Creating file type disk for virtual machine

qemu-img create -f qcow2 /gfs/vs_data/linux 100G #For Linux virtual machine

qemu-img create -f qcow2 /gfs/vs_data/windows 100G #For Windows virtual machine

Installing Virtual Machine

Installing Linux Virtual Machine

virt-install --ram=4096 --vcpus=4 --os-type=linux --os-variant=rhel6 \ --cdrom /gfs/ISOs/RHEL_Server_6.5_x86_64_DaleVS.iso --network bridge=br0 \ --disk path=/gfs/vs_data/linux,format=qcow2 --accelerate --vnc \ --name=linux --noautoconsole

Installing Windows Virtual Machine

virt-install --ram=4096 --vcpus=4 --os-type windows --os-variant=win2k8 \ --cdrom /gfs/ISOs/Win2k8.iso --network bridge=br0 \ --disk path=/gfs/vs_data/windows,format=qcow2,bus=virtio --disk /gfs/ISOs/virtio-win-disk.vfd,device=floppy\ --accelerate --vnc \ --name=windows --noautoconsole --hvm

Live Migrating Virtual Machine and the Question

[root@kvm1 ~]# virsh migrate --live --verbose linux qemu+ssh://kvm2/system

root@kvm2's password:

Migration: [100 %]

At this time, the file-system of linux virtual machine went to read-olny mode.

But when I live migrate a windows virtual machine, all works well.

Anyone can help me to fix it. thanks a lot!

  • 1
    the error messages: Message from syslogd@newvs at Jan 8 22:33:01 ... kernel:journal commit I/O error – user204702 Jan 8 '14 at 6:34
  • Looks like a storage level issue, if the VM didn't get paused, that means qemu io calls went through, but the guest OS still felt a glitch, hence the switch to r/o. check the storage level logs for this time on both hosts – dyasny Jan 9 '14 at 4:10
  • 1
    What is the ownership on your images after migration? Apparently, Libvirt doesn't detect glusterfs as a shared filesystem like it does NFS or Samba, so when a VM migrates away, the original host will chown root:root the disk image. Since the receiving host is running the VM as qemu:qemu (on RHEL6/CentOS6, at least), the image on glusterfs is now read-only to the VM. See: bugzilla.redhat.com/show_bug.cgi?id=1057645#c7 – Mark R Feb 26 '14 at 15:10
0

my kvm os is ubuntu 18.04, and I use

sudo fsck -y /dev/sda
sudo reboot

then all works good!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.